Report Date: 21-Jan-2000
Metadata Data Set Name:
                    IMS-16 Earthquake Scenario and Probabilistic
                    Ground Shaking Maps for Portland
  1 Identification Information
    1.1 Citation:
    8 Citation Information:
          8.1 Originator:
                    Oregon Department of Geology and Mineral
                    Industries
          8.2 Publication Date:
                    20000124
          8.4 Title:
                    Earthquake Scenario and Probabilistic Ground
                    Shaking Maps for the Portland, Oregon Metropolitan
                    Area
          8.5 Edition:
                    Version 1
          8.6 Geospatial Data Presentation Form:
                    maps
            8.7.1 Series Name:
                    Interpretive Map Series
            8.7.2 Issue Identification:
                    16
            8.8.1 Publication Place:
                    Portland, Oregon
            8.8.2 Publisher:
                    Oregon Department of Geology and Mineral
                    Industries
    1.2 Description
      1.2.1 Abstract:
                    This report and maps present development of the
                    first quantitative earthquake scenario and
                    probabilistic microzonation maps for ground
                    shaking for the Portland, Oregon, metropolitan
                    area. These GIS-based maps display color-contoured
                    ground motion values in terms of peak horizontal
                    acceleration and horizontal spectral accelerations
                    at 0.2- and 1.0-second periods. The maps depict
                    ground shaking at the ground surface and thus
                    incorporate the site-response effects of soils,
                    unconsolidated sediments, and shallow rock. The
                    scenario maps are for a moment magnitude (MW) 9.0
                    earthquake along the megathrust of the Cascadia
                    subduction zone and a hypothetical MW 6.8 event on
                    the Portland Hills fault. The probabilistic maps
                    are for the two return periods of building code
                    relevance, 500 and 2,500 years. It is our hope
                    that these maps will be used by government
                    agencies, the engineering, urban planning,
                    emergency preparedness and response communities,
                    and the general public as part of an overall
                    effort to reduce earthquake hazards in the
                    Portland metropolitan area.
      1.2.2 Purpose:
                    The purpose of this study was to develop both
                    deterministic earthquake scenario maps and
                    probabilistic ground shaking maps at a
                    microzonation level for the Portland metropolitan
                    area (defined as the Portland, Mount Tabor,
                    Gladstone, Lake Oswego, Beaverton, and Linnton
                    quadrangles). The most up-to-date information on
                    seismic sources, including characteristics of the
                    potential rupture plane for the Cascadia
                    megathrust earthquake and crustal faults within
                    the Portland region, has been incorporated into
                    the analysis.
    1.3 Time Period Of Content
    1.4 Status
      1.4.1 Progress:
                    Complete
      1.4.2 Maintenance and Update Frequency:
                    Unknown
    1.5 Spatial Domain
      1.5.1 Bounding Coordinates
        1.5.1.1 West Bounding Coordinate:
                    -122.876
        1.5.1.2 East Bounding Coordinate:
                    -122.498
        1.5.1.3 North Bounding Coordinate:
                    45.6261
        1.5.1.4 South Bounding Coordinate:
                    45.374
    1.7 Access Constraints:
                    None
    1.8 Use Constraints:
                    There are large uncertainties associated with
                    ground motion prediction in the Pacific Northwest
                    due to a limited amount of region-specific
                    information and data on the characteristics of
                    seismic sources and ground motions. In the
                    portrayal of the Cascadia subduction zone
                    scenario, the uncertainties in the geometry and
                    eastward extent of the rupture are particularly
                    large. Additional uncertainty stems from the
                    characterization of the subsurface geology beneath
                    Portland and the estimation of the associated site
                    response effects on ground motions. Thus the maps
                    should not be used for site-specific design or in
                    place of site-specific hazard evaluations.
    1.9 Point of Contact
           10.3 Contact Position:
                    Ivan Wong
           10.4 Contact Address
             10.4.1 Address Type:
                    mailing address
             10.4.2 Address:
                    Seismic Hazards Branch, URS Greiner Woodward Clyde
                    Federal Services, 500 12th Street, Suite 200
             10.4.3 City:
                    Oakland
             10.4.4 State or Province:
                    California
             10.4.5 Postal Code:
                    94607
             10.4.6 Country:
                    USA
           10.8 Contact Electronic Mail Address:
                    Ivan_Wong@urscorp.com
    1.11 Data Set Credit:
                    Douglas Wright
    1.12 Security Information
      1.12.1 Security Classification System:
                    None
    1.13 Native Data Set Environment:
                    ArcView
  2 Data Quality Information
  3 Spatial Data Organization Information
  4 Spatial Reference Information
    4.1 Horizontal Coordinate System Definition
      4.1.2 Planar
       4.1.2.1 Map Projection
         4.1.2.1.1 Map Projection Name:
                    Transverse Mercator
           4.1.2.2 Grid Coordinate System
             4.1.2.2.1 Grid Coordinate System Name:
                    Universal Transverse Mercator
            4.1.2.1.2.2 Longitude Of Central Meridian:
                    -123
            4.1.2.1.2.3 Latitude Of Projection Origin:
                    0
            4.1.2.1.2.4 False Easting:
                    500000
            4.1.2.1.2.5 False Northing:
                    0
            4.1.2.1.2.6 Scale Factor At Equator:
                    .9996
  5 Entity and Attribute Information
  6 Distribution Information
    6.1 Distributor
           10.1 Contact Person Primary
             10.1.1 Contact Person:
                    Donald Haines
             10.1.2 Contact Organization:
                    Oregon Department of Geology and Mineral
                    Industries
           10.2 Contact Organization Primary
             10.1.2 Contact Organization:
                    Nature of the Northwest Info Center (NNWIC)
             10.1.1 Contact Person:
                    Donald Haines
           10.3 Contact Position:
                    manager
           10.4 Contact Address
             10.4.1 Address Type:
                    mailing and physical address
             10.4.2 Address:
                    800 NE Oregon Street
             10.4.3 City:
                    Portland
             10.4.4 State or Province:
                    OR
             10.4.5 Postal Code:
                    97232
             10.4.6 Country:
                    USA
           10.5 Contact Voice Telephone:
                    503/872-2750
           10.6 Contact TDD/TTY Telephone:
                    unavailable
           10.7 Contact Facsimile Telephone:
                    503/731-4066
           10.9 Hours of Service:
                    9:00 a.m. to 5:00 p.m. Monday Through Friday
  7 Metadata Reference Information
   7.1 Metadata Date:
                    20000124
   7.4 Metadata Contact:
           10.1 Contact Person Primary
             10.1.1 Contact Person:
                    Paul Staub
             10.1.2 Contact Organization:
                    Oregon Department of Geology and Mineral
                    Industries (DOGAMI)
           10.3 Contact Position:
                    Cartographer
           10.4 Contact Address
             10.4.1 Address Type:
                    mailing address
             10.4.2 Address:
                    800 NE Oregon Street
             10.4.3 City:
                    Portland
             10.4.4 State or Province:
                    Oregon
             10.4.5 Postal Code:
                    97232
             10.4.6 Country:
                    USA
           10.5 Contact Voice Telephone:
                    503/731-4100
           10.6 Contact TDD/TTY Telephone:
                    unavailable
           10.7 Contact Facsimile Telephone:
                    503/731-4066
    7.5 Metadata Standard Name:
                    FGDC Content Standard For Digital Geospatial
                    Metadata
    7.8 Metadata Access Constraints:
                    None
    7.9 Metadata Use Constraints:
                    None
    7.10 Metadata Security Information
     7.10.1 Metadata Security Classification System:
                    None
     7.10.2 Metadata Security Classification:
                    Unclassified