Identification_Information: Citation: Citation_Information: Originator: S.P. Schilling Originator: S. Doelger Originator: W.E. Scott Originator: R.M. Iverson Originator: S.P. Schilling Originator: B.J. Fischer Publication_Date: 2008 Title: Digital Data for Volcano Hazards of the Three Sisters 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/2007/1221/ Description: Abstract: Three Sisters are one of three active volcanic centers that lie close to rapidly growing communities and resort areas in Central Oregon. The major composite volcanoes of this area are clustered near the center of the region and include South Sister, Middle Sister, and Broken Top. Additionally, hundreds of mafic volcanoes are scattered throughout the Three Sisters area. These range from small cinder cones to large shield volcanoes like North Sister and Belknap Crater. The most probable and dangerous consequence of a future eruption would most likely be a lahar (fast mudflow) originating on the steep flanks of a composite volcano. The size and area affected by large volcanic debris flows can vary greatly. Scientists at the Cascade Volcano Observatory created a GIS data set which depicts proximal and distal lahar hazard zones as well as a regional lava flow hazard zone. The various distal lahar zones were constructed from LAHARZ software using 20, 100, and 500 million cubic meter input flow volumes. Additionally, scientists used the depositional history of past events in the Three Sisters Region as well as experience and judgment derived from the study of volcanoes to help construct the regional hazard zone. 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 hazards from potential future eruptions of volcanoes in the Three Sisters region. 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 events believed most likely from future activity of volcanoes in the Three Sisters region. 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. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Currentness_Reference: 1999 Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.951759 East_Bounding_Coordinate: -121.200539 North_Bounding_Coordinate: 44.603093 South_Bounding_Coordinate: 43.565655 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: lahar Theme_Keyword: mudflow Theme_Keyword: hazard zone Theme_Keyword: composite volcano Theme_Keyword: debris flow Theme_Keyword: volcanic Theme_Keyword: GIS data Theme_Keyword: proximal hazard Theme_Keyword: distal hazard Theme_Keyword: hazard Theme_Keyword: lava flow Theme_Keyword: laharz Theme_Keyword: tephra Theme_Keyword: debris avalanche Theme_Keyword: pyroclastic flow Theme_Keyword: ballistic Theme_Keyword: recurrence Theme_Keyword: size Place: Place_Keyword_Thesaurus: none Place_Keyword: Three Sisters Region Place_Keyword: North Sister Place_Keyword: Middle Sister Place_Keyword: South Sister Place_Keyword: Broken Top Place_Keyword: Mount Washington Place_Keyword: Belknap Crater Place_Keyword: Mount Bachelor Place_Keyword: Cascade Range Place_Keyword: Oregon Place_Keyword: Sisters Place_Keyword: Bend Place_Keyword: USA Place_Keyword: Pacific Northwest 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: USGS Cascade Volcano Observatory Contact_Address: Address_Type: mailing and physical address Address: 1300 SE Cardinal Ct. Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Contact_Voice_Telephone: 360-993-8900 Contact_Facsimile_Telephone: 360-993-8980 Data_Set_Credit: The distal hazard zones were delineated by running the GIS software, LAHARZ. The model runs and compilation of the datasets were completed by USGS staff. Determination of hypothetical lahar volumes and field observations were provided by USGS scientists. 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: W.E. Scott Originator: R.M. Iverson Originator: S.P. Schilling Originator: B.J. Fischer Publication_Date: 1999 Title: Volcano Hazards in the Three Sisters Region, Oregon Series_Information: Series_Name: U.S. Geological Survey Open-file Report Issue_Identification: 99-437 Publication_Information: Publication_Place: Vancouver, WA Publisher: U.S. Geological Survey Cross_Reference: Citation_Information: Originator: S.P. Schilling Publication_Date: 1998 Title: LAHARZ: GIS programs for automated delineation of lahar hazard zones Series_Information: Series_Name: U.S. Geological Survey Open-file Report Issue_Identification: 98-638 Publication_Information: Publication_Place: Vancouver, WA Publisher: U.S. Geological Survey 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 that may be affected by volcanic processes during future eruptions of the North, Middle, or South Sister volcanoes. Additionally, this data set includes areas that could be impacted by potential activity of mafic volcanoes within the greater region. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: For the proximal and distal hazard zones, the horizontal accuracy was derived from underlying digital elevation models (best available). For the hand mapped regional hazard zone: Original linework were 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 discrepency of greater than a linewidth (approximately 0.007 inches). For computer modeling, 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: For the distal and prozimal hazard zones, no Vertical positonal data were recorded For the regional hazard zone: 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: The proximal and distal hazard zones were created using LAHARZ (Schilling, 1998) software that automatically delineates areas of potential inundation by future lahars. We defined a range of flow volumes that bracketed the most likely future lahar volume(s) for the volcano from geologic information and field investigations. Completed calculations for each drainage results in the creation of a grid for each volume and each drainage. The calculations for each input flow volume produce a separate grid. Each single grid is converted to a vector file for display. The final vector files should be displayed as a set of nested, overlapping hazard zones to show the range of inundation areas derived from a range of possible lahars that, from smallest to largest, have increasing frequency and decreasing magnitude. Scientists at the CVO used observation, evidence and reasoning to create the Regional Lava Flow hazard zone which is based on the extent of other potentially active mafic volcanoes in the region. Linework was captured by hand digitizing. Process_Step: Process_Description: 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_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\sschilli\LOCALS~1\Temp\xml1B.tmp Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\sschilli\LOCALS~1\Temp\xml27.tmp Spatial_Data_Organization_Information: 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: 3552 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Label point Point_and_Vector_Object_Count: 1662 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 1662 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 34 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Transverse Mercator 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: D_Clarke_1866 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: sis3haz.aat Entity_Type_Definition: Arc Attribute Table Entity_Type_Definition_Source: 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: 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: SIS3HAZ# 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: SIS3HAZ-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: LCODE Attribute_Definition: Line code delineates boundary arcs for proximal, distal, and regional hazard zones Attribute_Definition_Source: Computer modeling, experience, and interpretation Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 Enumerated_Domain_Value_Definition: Arcs delineating the boundaries of the distal and regional hazard zones in the Three Sisters area. Enumerated_Domain_Value_Definition_Source: Author Enumerated_Domain: Enumerated_Domain_Value: 20 Enumerated_Domain_Value_Definition: Arcs delineating the boundary of the proximal hazard zone around North, Middle, and South Sister volcanoes. Enumerated_Domain_Value_Definition_Source: Author Detailed_Description: Entity_Type: Entity_Type_Label: sis3haz.pat Entity_Type_Definition: Polygon Attribute Table Entity_Type_Definition_Source: 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: 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: SIS3HAZ# 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: SIS3HAZ-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: GRID-CODE Attribute_Definition: Attribute delineates the areas of every hazard zone polygon Attribute_Definition_Source: Enumerated_Domain Enumerated_Domain_Value Enumerated_Domain Enumerated_Domain_Value Enumerated_Domain Enumerated_Domain_Value Enumerated_Domain Enumerated_Domain_Value Enumerated_Domain Enumerated_Domain_Value Overview_Description: Entity_and_Attribute_Overview: SIS3HAZ.AAT - Arc Attribute Table FID, Shape, FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, SIS3HAZ#, and SIS3HAZ-ID are created and maintained automatically for internal use by Arc/INFO software. LCODE is defined as having a width of 3, an output of 3, and as an integer value. The attribute may have a positve integer value of 0 or 20. Arcs given the LCODE 0 delineate the boundaries of the distal and regional hazard zones in the Three Sisters area. Arcs given the LCODE 20 delineate the boundary of the proximal hazard zone around North, Middle, and South Sister volcanoes. SIS3HAZ.PAT - Polygon Attribute Table The attributes FID, Shape, AREA, PERIMETER, SIS3HAZ#, and SIS3HAZ-ID are created and maintained automatically for internal use by Arc/INFO software. GRID CODE is defined as having a width of 4 and an output of 8. Grid Code attributes define the types of different volcanic hazards and represent polygons that have been separated into proximal (near the volcanic edifice) and distal (more distant from edifice, primarily down major stream drainages) and Regional hazard zones. GRID CODE VALUE and DESCRIPTION 0 No data. Proximal Hazard Zone - 20 Represents the single proximal hazard zone around the Three Sisters volcanoes. It is an area subject to rapidly moving, devastating pyroclastic flows, debris avalanches, and lahars, some of which could reach the hazard-zone boundary in less than a few minutes. Areas are also subject to ballistic projectiles and lava flows. Distal hazard Zones - are valleys heading on high peaks in the Three Sisters region that are subject to lahars generated by pyroclastic flows and to debris avalanches/lahars originating on steep upper volcano flanks. Distal hazard zones are subdivided into three nested zones on the basis of a range of hypothetical lahar volumes and associated ranges of lahar probability. 7 20 million cubic meter hypothetical lahars 8 100 million cubic meter hypothetical lahars 9 500 million cubic meter hypothetical lahars Regional hazard zone - 10 Represents the greater Three Sisters regional hazard area that could be affected by eruptions of mafic volcanoes. Hazards include localized thick tephra fall, ballistics, and pyroclastic flows near vents. Lava flows can travel up to 15 kilometers from vents. Distribution_Information: Resource_Description: Downloadable Data Distribution_Liability: This dataset has not been approved for release or publication by the Director of the USGS. 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 1.744 Metadata_Reference_Information: Metadata_Date: 20060815 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Cascade Volcano Observatory Contact_Person: CVO Staff Contact_Address: Address_Type: mailing and physical address Address: 1300 SE Cardinal Ct. Suite 100 City: Vancouver State_or_Province: WA Postal_Code: 98683 Contact_Voice_Telephone: 360-993-8900 Contact_Facsimile_Telephone: 360-993-8980 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile