Identification_Information:
Citation:
Citation_Information:
Originator: S.P. Schilling
Originator: S. Doelger
Originator: W.E. Scott
Originator: T.C. Pierson
Originator: J.E. Costa
Originator: C.A. Gardner
Originator: J.W. Vallance
Originator: J.J. Major
Publication_Date: 2008
Title: Digital Data for Volcano Hazards in the Mount Hood Region, Oregon
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Publication_Information:
Publication_Place: Vancouver, WA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2007/1222/
Description:
Abstract: Mt Hood is a potentially active volcano that lies close to growing communities and recreation areas. The greatest hazard from a future eruption would be for lahars (fast moving mudflows) to sweep down river channels surrounding the mountain, causing property damage or destruction. Scientists at the USGS Cascade Volcano Observatory created the GIS data layer mthhaz to delineate proximal and distal hazard zones that could be affected by lahars in the event of an eruption. This data set was generated with a combination of computer modeling and geologic evidence of past events at Mt. Hood as recorded in deposits. An additional data layer, mtharr, shows points along the riverbeds that give the estimated time travel for potential lahars.
Purpose:
These volcanic hazard zones are intended for use by public and private
agencies to view, overlay with other Geographic Information System (GIS) data
sets, and make maps of volcanic hazards from potential future eruptions of
Mount Hood, Oregon. It is critical to understand the nature of the boundaries
of the volcanic hazard zones. Although arcs serve as boundaries of hazard
zones, the degree of hazard does not change abruptly at these boundaries.
Rather, a volcanic hazard decreases gradually with increased distance from
the volcano and above the valley floor. These volcanic hazards also span a
range of size and recurrence. The hazard zones delineated in this data set
portray volcanic events believed most likely from future activity at Mount
Hood, Oregon. Areas outside the hazard zones, especially those having low
relief, should not be regarded as hazard-free. Too many uncertainties exist
in source, size, and mobility of future events to locate boundaries of
zero-hazard zones with confidence.
Other_References_Cited:
Costa, John E., 1997, Hydraulic modeling for lahar hazards at Cascade
volcanoes: Environmental & Engineering Geoscience, V. 3, No. 1, pp. 21-30.
Schilling, Steve P. and Iverson, Richard M., 1997, Automated, reproducible
delineation of zones at risk from inundation by large volcanic debris flows:
in Chen, C. (editor), Hazards mitigation: mechanics, prediction, and
assessment, Proceedings of first international conference, American Society of
Civil Engineers, pp 176-186.
Scott, W.E., Pierson, T.C., Schilling, S.P., Costa, J.E., Gardner, C.A.,
Vallance, J.W., and Major, J.J., 1997, Volcano hazards in the Mount Hood
Region, Oregon: U.S. Geological Survey, Open-file Report 97-89, 14 p.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Currentness_Reference:
Coverage was used to create hazard assessment map for Mount Hood (Scott and
others, 1997).
Status:
Progress: Complete
Maintenance_and_Update_Frequency: as needed.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.503659
East_Bounding_Coordinate: -120.814807
North_Bounding_Coordinate: 45.757948
South_Bounding_Coordinate: 45.126630
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: hazard
Theme_Keyword: volcanic hazard
Theme_Keyword: pyroclastic flow
Theme_Keyword: surge
Theme_Keyword: lava dome
Theme_Keyword: debris avalanche
Theme_Keyword: debris flow
Theme_Keyword: lahar
Theme_Keyword: mudflow
Theme_Keyword: proximal hazard
Theme_Keyword: distal hazard
Theme_Keyword: travel time
Theme_Keyword: recurrence
Theme_Keyword: size
Theme_Keyword: laharz
Theme_Keyword: GIS data
Place_Keyword: computer modeling
Theme_Keyword: lava flow
Theme_Keyword: ballistic
Theme_Keyword: flood modeling
Theme_Keyword: DAMBRK
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Mt. Hood
Place_Keyword: Mount Hood
Place_Keyword: Cascade Range
Place_Keyword: Oregon
Place_Keyword: USA
Place_Keyword: Pacific Northwest
Place_Keyword: Crater Rock
Place_Keyword: Sandy River
Place_Keyword: white River
Place_Keyword: Hood River
Place_Keyword: Columbia River
Place_Keyword: Troutdale
Place_Keyword: White Salmon
Access_Constraints: none
Use_Constraints:
Although digital data is easy to view at nearly any scale or projection, each
vector data set has a compilation scale that determines the accuracy and
reliable use of the data set. The vectors in this data set were compiled and
checked for accuracy at a scale of 1:100,000 and thereby should only be used
at 1:100,000 or smaller scales. The data set is inappropriate for use at
scales larger than 1:100,000. Doing so will produce inaccurate and
unreliable results.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Steve Schilling
Contact_Address:
Address_Type: mailing and physical address
Address: Cascades Volcano Observatory 1300 SE Cardinal Ct. Suite 100
City: Vancouver
State_or_Province: WA
Postal_Code: 98683
Country: USA
Contact_Voice_Telephone: (360) 993-8900
Contact_Facsimile_Telephone: (360) 993-8980
Contact_Electronic_Mail_Address: sschilli@usgs.gov
Data_Set_Credit:
S.P. Schilling, W.E. Scott, T.C. Pierson, J.E. Costa, C.A. Gardner, and
J.J. Major (all from the U.S. Geological Survey, Cascades Volcano Observatory,
Vancouver, WA 98661) and J.W. Vallance (from McGill University, Department of
Civil Engineering and Applied Mechanics, 817 Sherbrooke St. West, Montreal,
QC, H3A 2K6, Canada) contributed scientific knowledge and interpretation of
volcanic processes to create this data set.
Security_Information:
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.3.0.800
Cross_Reference:
Citation_Information:
Originator: Scott, W. E.
Originator: Pierson, T. C.
Originator: Schilling, S. P.
Originator: Costa, J. E.
Originator: Gardner, C. A.
Originator: Vallance, J. W.
Originator: Major, J. J.
Publication_Date: 1997
Title: Volcano hazards in the Mount Hood region, Oregon
Series_Information:
Series_Name: U.S. Geological Survey Open-file Report
Issue_Identification: 97-89
Publication_Information:
Publication_Place: Vancouver, WA
Publisher: U.S. Geological Survey
Online_Linkage:
Cross_Reference:
Citation_Information:
Originator: Costa, John E.
Publication_Date: 1997
Title: Hydraulic Modeling for Lahar Hazards at Cascades Volcanoes
Series_Information:
Series_Name: Environmental & Engineering Geoscience
Issue_Identification: Vol. III, No. 1
Publication_Information:
Publication_Place: Boulder, CO
Publisher: Geological Society of America and Association of Engineering Geologists
Cross_Reference:
Citation_Information:
Originator: Schilling, Steve P.
Originator: Iverson, Richard M.
Publication_Date: 1997
Title:
Automated, Reproducible Delineation of Zones at risk from inundation by Large
Volcanic debris flows
Series_Information:
Series_Name: Debris-flow Hazards Mitigation: Mechanics, Prediction, and Assessment
Issue_Identification: 1
Publication_Information:
Publication_Place: New York, NY
Publisher: American Society of Civil Engineers
Other_Citation_Details:
(Editor) Chen, Cheng-lung
Proceeding of First International Conference
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: See Entity_Attribute_Information
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: See Explanation
Attribute_Accuracy_Explanation:
The attribute accuracy is described, where present, with each attribute
defined in the Entity and Attribute Section.
Logical_Consistency_Report:
Polygon and chain-node topology present. Hazard zone polygons are
logically consistent throughout coverage.
Completeness_Report:
This data set includes hazard zones in the Mount Hood area that may be
affected by volcanic processes during a future eruption of Mount Hood.
This data set does not include zones of hazard that may be affected by
future eruptions of numerous other volcanic vents in the Mount Hood region.
This data set also includes travel time marker locations along drainages in the Mount Hood
area that may be impacted by volcanic processes during a future
eruption of Mount Hood. This data set does not include travel times
that may be affected by future eruption of numerous other volcanic vents
in the Mount Hood region.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Original linework was compiled on Mylar greenlines of U.S. Geological
Survey topographic quadrangles created according to National Map
Accuracy Standards. Digitized linework were plotted, registered to
original linework, and inspected visually for discrepancy of greater
than a linewidth (approximately 0.007 inches). For computer modelling,
Digital Elevation Models having cell sizes of about 62 ground meters or
about 2 millimeters on the map at 1:100,000 scale were derived from Digital
Line Graph contour layers that were created according to National Map
Accuracy Standards. All linework was plotted with DLG contour layers
to check for positional accuracy as are reasonable according to geologic
and hydrologic principles.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
1:100,000 scale Digital Line Graph (DLG) contours have contour intervals of
either 50 or 40 meters as well as Digital Elevation Models have vertical
accuracies according to the National Map Accuracy Standards. All linework
was plotted with DLG contour layers to check for positional accuracy
as are reasonable according to geologic and hydrologic principles.
Lineage:
Process_Step:
Process_Description:
Linework was captured by hand digitizing and computer modeling, and copyied from Digital Line Graph hydrology coverages. Digitizing procedures: Arcs were digitized in tablet inches from lines inked on 1:24,000 or 1:100,000 scale topographic Mylar greenlines. Each quadrangle was registered to the digitizer and re-registered to ensure that tics could be relocated with an RMS equal to or less than 0.004. Lines were digitized using a NODESNAP CLOSEST .05 and a weed tolerance of 0. A second coverage was CREATEd from the first. In INFO, the tics were changed from inch coordinates to decimal degree coordinates and saved. The decimal degree coordinate coverage was converted to a UTM projection using:
INPUT
PROJECTION GEOGRAPHIC
UNITS DD
PARAMETERS
OUTPUT
PROJECTION UTM
UNITS METERS
ZONE 10
PARAMETERS
END
Each coverage in inches was TRANSFORMed to the empty UTM coverage ensuring the transformation RMS was equal or less than 0.004 inches. The individual coverages were edgematched and merged into a single coverage. Coverages were checked for digitizing accuracy both before and after merging by plotting linework at 1:24,000 or 1:100,000 scale as appropriate and overlain on original linework.
Process_Date: Unknown
Process_Step:
Process_Description:
Procedures for computer modeling:
Major drainages west or north of Mount Hood were modeled for inundation by debris avalanche and lahar of about 500 million cubic meters by a preliminary version of LAHARZ software (Schilling and Iverson, 1997). This method creates inundation zones from cross-sections calculated a Digital Elevation Model in the ArcINFO Grid program. The resulting grid having a cell size of about 2 millimeters or about 62 meters on the ground, was converted to a polygon coverage. In ARCEdit, the polygon coverage and 1:100,000 scale contours were drawn as background coverages. Polygons were drawn (using geologic and hydrologic principles where needed) on-screen in the foreground that enclosed the area defined by the grid. The resulting coverage was plotted with 1:100,000 scale Digital Line Graph contours for review by scientists.
Process_Step:
Process_Description:
Clipping DLG hydrology coverage:
Arcs were clipped from 1:100,000 Digital Line Graph hydrology and added to the hazard coverage to close polygons along the Columbia River. Polygons were tagged with a PCODE value and arcs were tagged with an LCODE and SOURCE value. All arcs were inspected by authors from check plots and reviewers studied final plots at 1:100,000 scale
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Mount Hood Volcano and vicinity, Oregon
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 196
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 84
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 83
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 16
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -123.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000256
Ordinate_Resolution: 0.000256
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: mthhaz.aat
Entity_Type_Definition: Arc attribute table for MTHHAZ
Entity_Type_Definition_Source: Field mapping, computer modelling, experience, and interpretation
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Unrepresentable_Domain: Coordinates that are automatically generated.
Attribute:
Attribute_Label: FNODE#
Attribute_Definition: Internal node number for the beginning of an arc (from-node).
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Whole numbers that are automatically generated.
Attribute:
Attribute_Label: TNODE#
Attribute_Definition: Internal node number for the end of an arc (to-node).
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Whole numbers that are automatically generated.
Attribute:
Attribute_Label: LPOLY#
Attribute_Definition: Internal node number for the left polygon.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Whole numbers that are automatically generated.
Attribute:
Attribute_Label: RPOLY#
Attribute_Definition: Internal node number for the right polygon.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Whole numbers that are automatically generated.
Attribute:
Attribute_Label: LENGTH
Attribute_Definition: Length of arc in meters.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: MTHHAZ#
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: MTHHAZ-ID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute:
Attribute_Label: LCODE
Attribute_Definition: Line code for drawing arcs
Attribute_Definition_Source: Field mapping, computer modelling, experience, and interpretation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Arc code used for displaying arcs
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 99
Enumerated_Domain_Value_Definition: Arc code used for displaying arcs
Enumerated_Domain_Value_Definition_Source: Author
Attribute:
Attribute_Label: SOURCE
Attribute_Definition: Sources used to create arcs
Attribute_Definition_Source: Field mapping, computer modelling, experience, and interpretation
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Arcs were digitized from stable Mylar bases containing hazard zone boundaries.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Arcs were digitized from stable mylar bases containing hazard zonation boundaries guided by output from flood routing computer model (DAMBRK).
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Arcs were derived from lahar inundation computer model (LAHARZ) using GIS software and Digital Elevation Model.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 99
Enumerated_Domain_Value_Definition: Arcs were clipped and added from 1:100,000 Digital Line Graphs of hydrology along the Columbia River or straight lines added to close polygons.
Enumerated_Domain_Value_Definition_Source: Author
Detailed_Description:
Entity_Type:
Entity_Type_Label: mthhaz.pat
Entity_Type_Definition: Polygon attribute table for MTHHAZ
Entity_Type_Definition_Source: Field mapping, computer modeling, experience, and interpretation
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates that are automatically generated.
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: MTHHAZ#
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: MTHHAZ-ID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: PCODE
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Vent at or near Crater Rock, which is considered the most likely case during future eruptions.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Vent on east, north, or west flank, or the summit (a summit vent also would endanger zone coded 1).
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Major valleys that pyroclastic flows and lahars would follow from lava- dome collapses on the upper flanks or summit. As an eruptive episode progresses, one or more of these valleys might become filled with debris, so that pyroclastic flows and lahars could then spill into adjacent valleys and affect a broader sector of a hazard zone. Also includes areas that are affected frequently (several times or more per century) by small lahars and debris avalanches generated by storms and rapid snowmelt.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 31
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 1 and 3.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 32
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 2 and 3.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 33
Enumerated_Domain_Value_Definition: Proximal Hazard Zone--Area that may be affected by hazards as described above for PCODE 3 and as described below for PCODE 20.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Sandy River and its tributaries and White River that are subject to lahars generated by eruptions at vent located at or near Crater Rock and to debris avalanches and related lahars generated from steep upper flanks on west and south sides of Mount Hood.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Hood River that are subject to lahars generated by eruptions at vents located on upper east or north flanks and to debris avalanches and related lahars of about 50 million cubic meters.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 20
Enumerated_Domain_Value_Definition: Distal Hazard Zone--Areas along Sandy and Hood Rivers subject to inundation by a debris avalanche and lahar of about 500 million cubic meters, which is considered to be among the largest magnitude events possible at Mount Hood.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 50
Enumerated_Domain_Value_Definition: Distal Hazard Zone--Columbia River islands and areas along the Washington shore that could be affected by bank erosion and flooding induced by lahars and sediment-rich floods from Sandy and Hood Rivers during and immediately following eruptions.
Enumerated_Domain_Value_Definition_Source: Author
Enumerated_Domain:
Enumerated_Domain_Value: 99
Enumerated_Domain_Value_Definition: Distal Hazard Zone--Internal polygon (polygon-in-polygon) not included in hazard zone or polygon that represents a lake within an island in the Columbia River.
Enumerated_Domain_Value_Definition_Source: Author
Overview_Description:
Entity_and_Attribute_Overview:
MTHHAZ.PAT - Polygon Attribute Table
The attributes AREA, PERIMETER, #, -ID are created
and maintained automatically for internal use by Arc/INFO software.
PCODE is defined as having width of 3, output of 3, and as an
integer value. The attribute may have a positve integer value between 0
and 999. Polygon attributes identify the type and nature of different
volcanic hazards. Polygons have been separated into proximal (near the
volcanic edifice) and distal (more distant from edifice, primarily down
major stream drainages) hazard zones.
Proximal Hazard Zones
Areas subject to rapidly moving, devastating pyroclastic flows and surges,
lahars, and debris avalanches that can sweep out to the hazard boundary in
less than 30 minutes. Also subject to ballistic projectiles and lava flows.
Subdivided into two zones depending on vent location.
PCODE VALUE DESCRIPTION
1 Vent at or near Crater Rock, which is considered the most
likely case during future eruptions.
2 Vent on east, north, or west flank, or the summit (a summit
vent also would endanger zone coded 1).
3 Major valleys that pyroclastic flows and lahars would follow
from lava- dome collapses on the upper flanks or summit. As an
eruptive episode progresses, one or more of these valleys might
become filled with debris, so that pyroclastic flows and lahars
could then spill into adjacent valleys and affect a broader
sector of a hazard zone. Also includes areas that are affected
frequently (several times or more per century) by small lahars
and debris avalanches generated by storms and rapid snowmelt.
31 Area that may be affected by hazards as described above for
PCODE 1 and 3.
32 Area that may be affected by hazards as described above for
PCODE 2 and 3.
33 Area that may be affected by hazards as described above for
PCODE 3 and as described below for PCODE 20.
Distal Hazard Zones
Valleys heading on Mount Hood that are subject to lahars and debris
avalanches. Marks along the valley floor show the estimated travel time for
lahars of the size used to define zones DA and DB. Subdivided into three
zones on the basis of vent location, event magnitude, and probability of
inundation.
10 Areas along Sandy River and its tributaries and White River
that are subject to lahars generated by eruptions at vent
located at or near Crater Rock and to debris avalanches and
related lahars generated from steep upper flanks on west and
south sides of Mount Hood.
11 Areas along Hood River that are subject to lahars generated
by eruptions at vents located on upper east or north flanks
and to debris avalanches and related lahars of about 50
million cubic meters.
20 Areas along Sandy and Hood Rivers subject to inundation by a
debris avalanche and lahar of about 500 million cubic meters,
which is considered to be among the largest magnitude events
possible at Mount Hood.
50 Columbia River islands and areas along the Washington shore
that could be affected by bank erosion and flooding induced by
lahars and sediment-rich floods from Sandy and Hood Rivers
during and immediately following eruptions.
99 Internal polygon (polygon-in-polygon) not included in hazard
zone or polygon that represents a lake within an island in
the Columbia River.
MTHHAZ.AAT - Arc Attribute Table
FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, #, -ID
are created and maintained automatically for internal use by Arc/INFO
software. Attribute LCODE is defined as having width of 3, output of 3, and
as an integer value. The attribute may have a positve integer value between
0 and 999. Arcs were given the attribute LCODE to indicate whether they
should be drawn (LCODE = 1) or should not be drawn (LCODE = 99) when plotting
the Mount Hood hazard zonation map.
Arcs were given an attribute of SOURCE to indicate the original method used
to create the given arc as described below:
SOURCE VALUE DESCRIPTION
1 Arcs were digitized from stable Mylar bases containing hazard
zonation boundaries.
2 Arcs were digitized from stable Mylar bases containing hazard
zonation boundaries guided by output from flood routing
computer model (DAMBRK).
3 Arcs were derived from lahar inundation computer model
(LAHARZ) using GIS software and Digital Elevation Model.
99 Arcs were clipped and added from 1:100,000 Digital Line
Graphs of hydrology along the Columbia River or straight
lines added to close polygons.
Entity_and_Attribute_Detail_Citation: Not Available
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: mtharr.pat
Entity_Type_Definition: Point attributes
Entity_Type_Definition_Source: Scientific Interpretation
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates that are automatically generated
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: -
Enumerated_Domain_Value_Definition_Source: -
Unrepresentable_Domain: Area is always zero for point coverages. Values are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: -
Enumerated_Domain_Value_Definition_Source: -
Unrepresentable_Domain: Perimeter is always zero for point coverages. Values are automatically generated.
Attribute:
Attribute_Label: MTHARR#
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: MTHARR-ID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Attribute:
Attribute_Label: TIME
Attribute_Definition: estimated travel time for potential lahars
Attribute_Definition_Source: Scientific Interpretation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer values
Enumerated_Domain_Value_Definition: Value represents travel time in hours and minutes from source to point on map
Enumerated_Domain_Value_Definition_Source: Author
Attribute:
Attribute_Label: ANGLE
Attribute_Definition: Rotation angle of the arrow marker
Attribute_Definition_Source: Scientific modeling and empirical
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer values 0 - 360
Enumerated_Domain_Value_Definition: Angle in degrees
Enumerated_Domain_Value_Definition_Source: Author
Overview_Description:
Entity_and_Attribute_Overview:
MTHARR.PAT - Point Attribute Table
The attributes AREA, PERIMETER, #, -ID are created
and maintained automatically for internal use by Arc/INFO software.
TIME is defined as having width of 4, output of 4, and as a character
value. The attribute may have integer as character values between 0 and
99, a ':', and integer character values between 0 and 60. ANGLE is
defined as having width of 3, output of 3, and is an integer value
between 0 and 360 indicating the rotation angle of the arrow marker.
Entity_and_Attribute_Detail_Citation: Not Available
Distribution_Information:
Resource_Description: Downloadable Data
Distribution_Liability:
The USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Distribution of the database files assumes that all components of the database will be used together. Use of any one ArcInfo coverage outside the context of the other coverages is considered inappropriate or misuse.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.237
Metadata_Reference_Information:
Metadata_Date: 20060815
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Schilling, Steve P.
Contact_Organization: USGS Cascade Volcano Observatory
Contact_Address:
Address_Type: mailing and physical address
Address: 1300 Cardinal Ct. Suite 100
City: Vancouver
State_or_Province: WA
Postal_Code: 98683
Country: USA
Contact_Voice_Telephone: (360) 993-8900
Contact_Facsimile_Telephone: (360) 993-8980
Contact_Electronic_Mail_Address: sschilli@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile