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Metadata
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ID
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C-1-94-WO
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Also Known As
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C1-94-OW
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Abstract
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United States Geological Survey, Menlo Park, California.
Chief Scientists: Holly Ryan, Andy Stevenson. Geophysical
data (Geopulse, mudshark, YoNav) of field activity C-1-94-WO
in Columbia River from 07/18/1994 to 07/25/1994
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Organization
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United States Geological Survey, Menlo Park, California
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Project/Theme
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Crustal Earthquake Hazards
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National Plan
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Hazards
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Chief Scientist
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Holly Ryan
Andy Stevenson
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Activity Type
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Geophysical
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Platform
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Cathlemet Bay
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Area of Operation
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Columbia River
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Location map
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Bounding Coordinates
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46.25611
-123.97586 -122.32660
45.54842
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Dates
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07/18/1994 (JD 199) to 07/25/1994 (JD 206)
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Analog Materials
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list
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Index map
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Crew
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Holly Ryan
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Chief Scientist, USGS Western Region
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Andy Stevenson
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Chief Scientist, USGS Western Region
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Equipment Used
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Purpose
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Feasibility study to determine if high resolution seismic reflection
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data of reasonable quality could be collected in the Columbia River to help
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assess earthquake hazards of the Portland, OR / Vancouver, WA metropolitan
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area.
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Information to be Derived
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Seismic reflection profiles from Geopulse and trackline map.
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Summary
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Approximately 3 1/2 days of geopulse data were collected in six areas
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of the Columbia River between Astoria, OR and Washougal, WA across the following
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fault zones: Clatskanie, Columbia River, Chinook, Firn Hill, Portland Hills,and
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Frontal fault zones, and unnamed faults near Portland International Airport, and
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Trojan nuclear power plant. Navigation and seismic data were merged and recorded
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on two optical disks. 14 rolls (representing different geographic locations) of
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analog data were collected.
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Notes
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Navigation data are in USGS data base. The rest of the data should be
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input by 1/1/95, unless requested sooner.
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(modified from 7/29/94 USGS Bulletin)
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COLUMBIA RIVER CRUISE
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Holly Ryan, Andy Stevenson, and Jim Vaughn are back from a successful but
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HOT--+100d F!) 5-day reconnaissance cruise to the Columbia River collecting
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high resolution geopulse data in search of recent upper crustal faulting, as
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part of the Cascadia earthquake hazards project.
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Al Niem from Oregon State University joined us for two days.
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Data were collected aboard the Cathlamet Bay, a 26-foot Army Corps of
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Engineering boat that allowed data acquisition in only a few meters of water.
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The logistics of mounting all of the equipment on the boat was somewhat of a
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headache, but the expertise of the boat driver, Terry Vance of the Corps, more
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than made up for the lack of space, and contributed immensely to the success
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of the cruise.
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Although we were not able to image much more than about 10 to 20 m below the
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river bottom, we did observe evidence suggestive of recent faulting at several
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sites.
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These included the northern and southern bounding faults of Portland Basin,
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near Portland International Airport, near the now defunct Trojan nuclear power
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plant, and along northwest trending faults in the lower Columbia River near
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Astoria.
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We hope to be able to go back at some time in the future using a larger source
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to be able to confirm our results.
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Publications
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Ryan, H.F., and Stevenson, A.J., 1995, Cruise report for C1-94-OW:
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Reconnaissance high resolution Geopulse data acquired for seismic
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hazard studies along the Columbia River from July 18-22, 1994: U.S.
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Geological Survey Open-File Report 95-668, 38 p.
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Got Help?
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For C-1-94-WO, we would appreciate any information on -- contract, days at sea, dive count, funding, information specialist, kms of navigation, NGDC Info, owner, ports, project number, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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