Identification_Information: Citation: Citation_Information: Originator: Steve P. Schilling Originator: Sarah Doelger Originator: Charles R. Bacon Originator: Larry G. Mastin Originator: Kevin M. Scott Originator: Manuel Nathenson Publication_Date: 2008 Title: Digital Data for Volcano and Earthquake Hazards in the Crater Lake 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/2007/1223/ Description: Abstract: The volcanic center that exists below Crater Lake caldera today is not currently active, however volcanic activity in the future is imminent. The presence of a lake in this potentially active site poses unique hazards to the surrounding region. Additionally, numerous faults exist throughout the Crater Lake area that are known to have been active in the recent past. USGS scientists created one GIS data layer, c_faults, that delineates these faults and one layer, cballs, that depicts which direction the faults dip. Additional GIS layers chazline, chaz, and chazpoly were created to show 1)the extent of pumiceous pyroclastic-flow deposits of the caldera forming Mount Mazama eruption, 2)silicic and mafic vents in the Crater Lake region, and 3)the proximal hazard zone around the caldera rim, respectively. Purpose: These volcanic and earthquke 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 potential volcanic and earthquake hazards in the Crater Lake area. 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 to occur in the Crater Lake area. 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: 1997 Currentness_Reference: 1997 Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.704647 East_Bounding_Coordinate: -121.489817 North_Bounding_Coordinate: 43.387360 South_Bounding_Coordinate: 42.492493 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Caldera Theme_Keyword: volcanic center Theme_Keyword: faults Theme_Keyword: hazard zone Theme_Keyword: pyroclastic flow Place: Place_Keyword_Thesaurus: none Place_Keyword: Crater Lake National Park Place_Keyword: Cascade Range Place_Keyword: Oregon 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: U.S. Geological Survey Volcano Hazards Program 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: Charles R. Bacon Originator: Larry G. Mastin Originator: Kevin M. Scott Originator: Manuel Nathenson Publication_Date: 1997 Title: Volcano and Earthquake Hazards in the Crater Lake Region, Oregon Series_Information: Series_Name: U.S. Geological Survey Open-file Report Issue_Identification: 97-487 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 Explaination 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 zonation polygons are logically consistent throughout coverage. Completeness_Report: This data set shows faults existing in the Crater Lake region that are known to have been active in the past few million years and points (balls) that represent the downthrown side of the faults. Also, this data set shows volcanic vents, the maximum extent of pumiceous pyroclastic-flow deposits from the climactic eruption of Mount Mazama (approx. 7,700 years ago), and the regional and proximal hazard zones around Crater Lake Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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 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. 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 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: 883 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 4 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: c_faults.aat Entity_Type_Definition: Arc Attribute Table Entity_Type_Definition_Source: Field mapping, 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 defining the features. 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 feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: C_FAULTS# 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: C_FAULTS-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: DATA Attribute_Definition: Describes characteristics of arcs Attribute_Definition_Source: Not used Attribute: Attribute_Label: FLT-CODE Attribute_Definition: Indicates mapped, concealed, or inferred nature of faults Attribute_Definition_Source: Field mapping, experience, and interpretation Overview_Description: Entity_and_Attribute_Overview: C_FAULTS.AAT - Arc Attribute Table The attributes FID, Shape, FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, C_FAULTS#, and C_FAULTS-IDare created and maintained automatically for internal use by Arc/INFO software. FLT-CODE is described as having a width of 3, an output of 3, and integer values. FLT-CODE VALUE and DESCRIPTION 0 Represented by a solid line on the map. These faults can be seen and mapped in the field. 1 Represented by a dashed line on map. Fault lines were inferred by the scientist in the field. 2 Represented by dotted lines on the map. Faults are concealed by younger deposits. 3 and 4 Short lines that are perpendicular to the larger fault lines. Represent the normal or reverse nature of faults. Lines designated by a 3 or 4 are on the downthrown side of the fault line. Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: chaz.aat Entity_Type_Definition: Arc Attribute Table Entity_Type_Definition_Source: Field mapping, 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 defining the features. 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 feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: CHAZ# 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: CHAZ-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: DATA Attribute_Definition: Identifies the names and types of vents mapped by scientists Attribute_Definition_Source: Not used Overview_Description: Entity_and_Attribute_Overview: CHAZ.AAT - Arc Attribute Table FID, Shape, FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, CHAZ#, and CHAZ-ID are created and maintained automatically for internal use by Arc/INFO software. Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: chazpoly.aat Entity_Type_Definition: Arc Attribute Table Entity_Type_Definition_Source: Field mapping, 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 defining the features. 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 feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: CHAZPOLY# 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: CHAZPOLY-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Detailed_Description: Entity_Type: Entity_Type_Label: chazpoly.pat Entity_Type_Definition: Polygon Attribute Table Entity_Type_Definition_Source: Field mapping, 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 defining the features. 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: CHAZPOLY# 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: CHAZPOLY-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: PCODE Attribute_Definition: Polygon code for proximal and regional hazard zones around Crater Lake Attribute_Definition_Source: Field mapping, experience, and interpretation Overview_Description: Entity_and_Attribute_Overview: CHAZPOLY.AAT - Arc Attribute Table FID, Shape, FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, CHAZPOLY#, and CHAZPOLY-ID are created and maintained automatically for internal use by Arc/INFO software. CHAZPOLY.PAT - Polygon Attribute Table The attributes FID, Shape, AREA, PERIMETER, CHAZPOLY#, CHAZPOLY-ID are created and maintained automatically for internal use by Arc/INFO software. PCODE 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 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 regional (more distant from edifice) hazard zones. PCODE VALUE and DESCRIPTION 4 Areas outside any designated hazard zones and bounded by the border of the hazards map published with the Crater Lake Open-file Report. The probability of an eruption in this zone is considered insignificant. 3 Regional hazard zone RL delineates an area with a relatively low probablility of volcanic eruption. Contains vents 100,000 to 1,000,000 years in age. 30 year probability of an eruption from a new vent is estimated to be 1in 3,000. 2 Regional hazard zone RH delineates an area with a relatively high probability of eruption. Contains vents less than 100,000 years in age. 30 year probability of an eruption is estimated to be 1 in 330. 1 Proximal hazard zone PB is an area outside of proximal hazard zone PA that may be affected by pyroclastic surges and ballistics from explosive eruptions from vents within the lake and close to the shoreline. The boundaries are defined by a height/runout ratio of 0.1 and a source of surges up to 500 meters above the lake surface. 5 Proximal hazard zone PA is an area bounded by Crater Lake caldera rim. It is subject to pyroclastic surges and ballistics from explosive eruptions anywhere within the caldera. Rock falls or landslides may occur on caldera walls during an earthquake. 99 The surface of Crater Lake. Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: cballs.pat Entity_Type_Definition: Point Attribute Table Entity_Type_Definition_Source: Field mapping and 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 defining the features. Attribute: Attribute_Label: AREA Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: 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: Unrepresentable_Domain: Perimeter is always zero for point coverages. Values are automatically generated. Attribute: Attribute_Label: CBALLS# 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: CBALLS-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Overview_Description: Entity_and_Attribute_Overview: CBALLS.PAT - Point Attribute Table The attributes FID, Shape, AREA, PERIMETER, CBALLS#, and CBALLS-ID are created and maintained automatically for internal use by Arc/INFO software. Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: chazline.aat Entity_Type_Definition: Arc Attribute Table Entity_Type_Definition_Source: Field mapping, 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 defining the features. 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 feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: CHAZLINE# 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: CHAZLINE-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: LCODE Attribute_Definition: Line code shows arcs for extent of pyroclastic flow deposits Attribute_Definition_Source: Field mapping, experience, and interpretation Overview_Description: Entity_and_Attribute_Overview: CHAZLINE.AAT - Arc Attribute Table FID, Shape, FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, CHAZLINE#, and CHAZLINE-ID are created and maintained automatically for internal use by Arc/INFOsoftware. 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 given an LCODE of 2 show the boundary for the maximum extent of pumiceous pyroclastic-flow depostits of the eruption of Mt. mazama. Arcs given an LCODE of 1 represent the boundaries for the regional hazard zones RH and RL and the proximal hazard zone PB around Crater Lake. These are described in detail and also shown in the CHAZPOLY coverage. 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. Use of any one ArcInfo coverage outside the context of the other coverages is considered inappropriate or misuse. Due to the uncertainty involved in the prediction of lahar-inundation limits, individual coverages do not delimit a well-defined range of hazard. The collective group of the ArcInfo coverages better convey the gradational nature of hazard zones. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.137 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