Metadata: Identification_Information: Citation: Citation_Information: Originator: Rhea, Susan Publication_Date: 1997 Title: Seismotectonic maps in the vicinity of the lower Wabash Valley, IL, IN, and KY - Digital Spatial Database: structure contours on Cambrain-Precambrain unconformity Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 97-0681 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Online_Linkage: Description: Abstract: This cover contains structure contours of the elevations of the unconformity at the Cambrian-Precambrain boundary. These data were contributed by Glenn Bear of Indiana University as part of the work on his doctoral thesis. The southern part of the map was produced by James Drahovzal of the Kentucky Geological Survey and merged with Bear's map of the rest of the map area and beyond. Use of public and proprietary seismic reflection and well data were used to define the structure. Units are in thousands of feet below sea level. A prominent east-west structure in the southern half of the map area is the western end of the Rough Creek Graben. At its deepest point the unconformity is more than 30,000 ft (9,100 m) below sea level. Faulted strata at this depth mean that the Rough Creek Fault System penetrates to hypocentral depths. At the western edge of the map area, the graben bends to the southwest into the Reelfoot Rift and becomes more shallow. North of the Rough Creek Graben, and extending northward along the Wabash River, is the Wabash Valley Fault System. This fault system cuts an elliptical low in the unconformity. Some of the structure contours show horizontal offsets at depths that are opposite to the offsets expected from the known normal slip on the faults. Some authors interpret this as evidence of strike slip motion on these faults. This cover contains all the contours including the extents outside the map area. "bcontours" is clipped to the map area. Purpose: The data was generated to help in understanding the seismotectonic hazards in the vicinity of the lower Wabash Valley. This data complements similar data collected in the vicinity of New Madrid, MO (US Geological Survey Open-File Report 95-0574, available via ftp at ) Time_Period_of_Content: Currentness_Reference: This is the most recent interpretation of the structure of the Cambrian-Precambrian unconformity in the map area (1997). Time_Period_Information: Single_Date/Time: Calendar_Date: Cambrian-Precambrian Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89 East_Bounding_Coordinate: -87 North_Bounding_Coordinate: 39 South_Bounding_Coordinate: 36.5 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Precambrian contours Place: Place_Keyword_Thesaurus: None Place_Keyword: Wabash Valley Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan Rhea Contact_Organization: US Geological Survey Contact_Position: Geophysicist Contact_Address: Address_Type: mailing address Address: MS966, Box 25046, Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-273-8639 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: rhea@usgs.gov Contact_Instructions: email is the best way to make contact Native_Data_Set_Environment: SunOS, 5.5.1, sun4u UNIX, ARC/INFO version 7.1.1 Cross_Reference: Citation_Information: Originator: Wheeler, Russell L., Susan Rhea, Sharon F. Diehl, James A. Drahovzal, Glenn W. Bear, and Michael L. Sargent Publication_Date: 1997 Title: Seismotectonic map showing faults, igneous rocks, and geophysical and neotectonic features in the vicinity of the lower Wabash Valley, IL, IN, and KY Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey I-Map Issue_Identification: I-2583-D Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Other_Citation_Details: pamphlet accompanies map Online_Linkage: Data_Quality_Information: Completeness_Report: data contains all contours and depths Logical_Consistency_Report: Chain-node topology present. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Bear, G.W., and Drahovzal, J.A. Publication_Date: written communication Geospatial_Data_Presentation_Form: map at 1:250,000 and digital files Other_Citation_Details: Bear mapped structure in the northern part of the map area for his dissertation at Indiana University. Drahovzal mapped structure in the southern part for a planned Kentucky Geological Survey map. Bear combined both maps into one and sent us the digital files. Source_Scale_Denominator: 250000 Type_of_Source_Media: paper, electronic mail system Source_Time_Period_of_Content: Source_Currentness_Reference: This dataset contains information about the structure of the Cambrian- Precambrian unconformity in the map area. This source reference, and an as yet unpublished Doctoral Thesis from Indiana University, are the most up-to-date interpretations of this geologic unconformity. Source_Contribution: authors sent digital coordinates of contours via email and paper copy of map with depth contours via surface mail. Source_Information: Source_Citation: Citation_Information: Originator: Bear, G.W., Rupp, J.A., and Rudman, A.J. Publication_Date: 1997 Title: Seismic interpretation of the deep structure of the Wabash Valley Fault System Geospatial_Data_Presentation_Form: text Series_Information: Series_Name: Seis. Res. Letters Issue_Identification: 68/4 Publication_Information: Publisher: Seis. Soc. America Other_Citation_Details: p 624-640. This paper discusses only the north-central part of the map area. Process_Step: Process_Description: Coordinates of contour lines were received via ftp, and a paper map was received via surface mail. Contour lines were converted to an arcinfo coverage and depth values were added by hand while comparing lines on the paper map to the digital view. Values assigned to contour lines were reviewed by Bear. Clipped from bcontours_all. Process_Date: 19970730 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 35 SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 413 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 0 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: Unknown Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: BCONTOURS.PAT Entity_Type_Definition: attributes of point symbols Entity_Type_Definition_Source: Rhea Attribute: Attribute_Label: SYMBOL Attribute_Definition: code for symbol used to plot syncline, anticline features Attribute_Definition_Source: Rhea Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 120 Enumerated_Domain_Value: 121 Enumerated_Domain_Value: 122 Enumerated_Domain_Value: 124 Entity_Type: Entity_Type_Label: BCONTOURS.AAT Entity_Type_Definition: attributes of contour lines Entity_Type_Definition_Source: Rhea, Bear Attribute: Attribute_Label: DEPTH Attribute_Definition: depth to Cambrain-PreCambrian unconformity, in thousands feet below sea level Attribute_Definition_Source: Bear Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -30 Range_Domain_Maximum: -6 Attribute_Units_of_Measure: thousands of feet below sea level Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: SYMBOL Attribute_Definition: code for symbol used to plot contours Attribute_Definition_Source: Rhea Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 202 Enumerated_Domain_Value: 203 Enumerated_Domain_Value: 204 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Susan Rhea Contact_Organization: US Geological Survey Contact_Position: Geophysicist Contact_Address: Address_Type: mailing address Address: USGS Mail Stop 966 Box 25046, Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-273-8639 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: rhea@usgs.gov Contact_Instructions: Email is the best way to make contact. Resource_Description: USGS Open-File Report 97-0681 Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. Technical_Prerequisites: ARC/INFO version 7.0.3 or later or ArcView 3.0 or later Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 7.0.3 Format_Information_Content: Each coverage contains isoseismal data for one event (two for i187609) File_Decompression_Technique: Files may be compressed with gzip; use gzip -d or gunzip to uncompress. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: ftp://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-97-0681/e00_files/bcontours_all.e00 Online_Computer_and_Operating_System: Data General AViiON 6220 running DG/UX 5.4R3.10 (Unix) Fees: none Metadata_Reference_Information: Metadata_Date: 19980506 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan Rhea Contact_Organization: US Geological Survey Contact_Position: Geophysicist Contact_Address: Address_Type: mailing address Address: MS966, Box 25046, Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-273-8639 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: rhea@usgs.gov Contact_Instructions: email is the best way to make contact Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608