2005020714353200FALSE20050207153954002005020715395400{03CB1F59-4EEC-49F3-A007-FF6C91D9518B}Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535enDEPTH TO THE JUAN DE FUCA SLAB BENEATH THE CASCADIA SUBDUCTION MARGIN: A 3D MODEL FOR SORTING EARTHQUAKES By P. A. McCrory, J. L. Blair, D. H. Oppenheimer, and S. R. Walter 2003, Version 1.0 OVERVIEW OF THE SLAB-GRID PROJECT We present an updated model of the Juan de Fuca slab beneath southern British Columbia, Washington, Oregon, and northern California, and use this model to separate earthquakes occurring above and below the slab surface. The model is based on depth contours previously published by Flück and others (1997). Our model attempts to rectify a number of shortcomings in the original model and update it with new work. The most significant improvements include 1) a gridded slab surface in geo-referenced (ArcGIS) format, 2) continuation of the slab surface to its full northern and southern edges, 3) extension of the slab surface from 50-km depth down to 110-km, beneath the Cascade arc volcanoes, and 4) revision of the slab shape based on new seismic reflection and seismic refraction studies. We have used this surface to sort earthquakes, and present some general observations and interpretations of seismicity patterns revealed by our analysis. In addition, we provide files of earthquakes above and below the slab surface, and a 3D animation or fly-through showing a shaded relief map with plate boundaries, the slab surface, and hypocenters for use as a visualization tool. We present an updated model of the Juan de Fuca slab beneath southern British Columbia, Washington, Oregon, and northern California, and use this model to separate earthquakes occurring above and below the slab surface. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and seismic information about the pacific northwest subduction complex.Patricia A. McCrory, James Luke BlairNovember, 2003slabgcs_wgs84raster digital dataUnknownFirstUSGS Information Services, Box 25286, Denver Federal Center, Denver, CO, 80225United States Geological SurveyUnited States Geological Survey, Earthquake Hazards Team,November, 2003UnknownFirsthttp://geopubs.wr.usgs.gov/*****/http://pubs.usgs.gov/ds/91/Data Series 91publication dateNovember, 2003CompleteNone planned-128.742637-120.47257151.74272538.843219-128.742637-120.47257138.84321951.742725-15045kmThesaurus of Geological termssubductionhypocenterThesaurus of Geological termsJuan De FucaPacific NorthwestCascadesDISCLAIMERS This Compact Disc Read-Only Memory (CD-ROM) publication was prepared by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe on privately owned rights. Reference therein to any specific commercial product, process, or service, by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. Although all data and software published on this CD-ROM have been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. This information is not intended for navigational purposes. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Raster DatasetJames Luke BlairUSGSManager, Menlo Park Earthquake Hazards Geographic Information Systems laboratory650-329-4707650-329-5163lblair@usgs.gov9-5 PSTUnclassifiedMicrosoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535slabgcs_wgs84-128.742637-120.47257151.74272538.8432191-128.742637-120.47257151.74272538.8432191enFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeUSGS officemenlo parkca94025

345 Middlefield Rd, mail stop 977,

usa650-329-4707James Luke BlairUSGS, Earthquake hazards teamGIS lab managerlblair@usgs.gov20050207http://www.esri.com/metadata/esriprof80.htmlESRI Metadata ProfileISO 19115 Geographic Information - MetadataDIS_ESRI1.0datasetData is compiled and released on CD.0.3060.306002file://\\BANANA\E$\temp\Final2\Binary\GIS_Data\slabgcs_wgs84Local Area Network0.306Raster DatasetRasterGrid Cell2871840.0449460.044946321Upper LeftFALSEDefault1matrix valuesTRUEESRI GRIDGCS_WGS_1984D_WGS_1984WGS_19846378137.000000298.257224Decimal degreesrow and column0.0449460.044946GCS_WGS_198420263211840.044946Degree2870.044946DegreeslabGCS_wgs84Table18881ObjectIDObjectIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ValueValueDouble000CountCountDouble000A ArcInfo Grid of the surface of the subducting Juan de Fuca plate beneath the pacific northwest of the USA.20050207The model is based on depth contours previously published by Flück and others (1997). Our model attempts to rectify a number of shortcomings in the original model and update it with new work. Contours of the slab surface were constructed after consideration of hypocenter locations, work by Flück and others (1997), and other publications listed here. After Contours were created, the ArcInfo Workstation command TOPOGRID was used to construct a Grid of the slab surface.2003111013144800James Luke BlairUSGS Earthquake Hazards, Mail Stop 977, Menlo Park, CA 94025Manager, GIS lab650-329-4707lblair@usgs.gov9-5 pstArcInfo workstation 8.3October 2003Metadata imported.E:\temp\Final\Binary\3D_GIS_Project\GIS_data\slab_grid\metadata.xml2005020714353200This slab surface was constructed after the consideration of multiple resources of data. This slab surface grid is only an interpretation by the authors of what is likely a very complex system. No degree of error was calculated in this report.This slab surface was constructed after the consideration of multiple resources of data. This slab surface grid is only an interpretation by the authors of what is likely a very complex system. No degree of error was calculated in this report.