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USGS CMG S-97-94-WG Metadata

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ID S-97-94-WG
Also Known As SO97
Abstract Chief Scientists: Roland Von Huene, Ernst Flueh. Geophysical data (bathymetry, magnetics, bottomseismometer) of field activity S-97-94-WG in Western Gulf of Alaska from 07/28/1994 to 08/29/1994
Project/Theme Seisvent
Chief Scientist Roland Von Huene
Ernst Flueh
Activity Type Geophysical
Platform F. S. Sonne
Area of Operation Western Gulf of Alaska
Bounding Coordinates
61.75000
-156.00000    -144.25000
54.00000
Dates 07/28/1994 (JD 209) to 08/29/1994 (JD 241)
Analog Materials No analog holdings.
Crew
Roland Von Huene Chief Scientist, USGS Western Region
Ernst Flueh Chief Scientist, GEOMAR
Equipment Used
bathymetry
magnetics
bottomseismometer
Purpose
Active seeping of fluids, including greenshouse gasses, from the accretionary 
wedge might influence global climate.  Fluids also strongly influence the 
mechanics of faults in the wedge.
Summary
A camera sled with video and still cameras was used
to verify the presence of clam and worm communities
that are known to inhabit active seeps.
Water and sediment samples were collected near the seeps.
OBSs were deployed to measure the velocity of sediment
to estimate the compaction and loss of porosity.
Notes
USGS contact: Mike Fisher
  (from 9/2/94 USGS Bulletin) During July the German research ship Sonne
  conducted geochemical and geophysical research in the Gulf of Alaska. Chief
  scientists Roland Von Huene and Ernst Flueh of GEOMAR in Germany were
  interested in measuring the flux of greenhouse gasses from the accretionary
  wedge near the Aleutian Trench. Multichannel seismic and Hydrosweep
  bathymetric data provided initial clues to locate potential fluid seeps, and
  the geochemists investigated likely sites using a video-camera sled. Although
  we found no obvious seeps, ever optimistic scientists hoped that the following
  cruise would identify additional sites for detailed analysis. Another research
  goal was to collect detailed seismic-velocity information from accreted rocks
  near the trench. From these data, geophysicists hoped to calculate gradients
  in the degree of compaction of accreted sediment as well as the volume of
  fluid expelled. The seismic source was two monstrous (2000 cu. in. each) air
  guns. Ten OBSs were deployed repeatedly with great success in this endeavor.
  Unfortunately, foul weather foiled our attempt to measure the seismic velocity
  of highly reflective rocks that form the middle and lower crust of the
  accretionary complex near lower Cook Inlet. The highlight of the cruise came
  with our realization that enigmatic features in USGS and Hydrosweep data
  revealed collision scars that resulted from subduction of seamounts and
  collision of the Yakutat terrane. Mike Fisher
Got Help? For S-97-94-WG, we would appreciate any information on -- analog materials, contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, national plan, NGDC Info, organization, owner, ports, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
Type Webpage KMZ Arc         Metadata        
Metadata data     txt  data  FAQ  xml
Navigation data nav    
Times   050.times    

S-97-94-WG location map of where navigation 

equipment operated

 
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Page Last Modified: Mon Apr 1 13:18:53 PDT 2013  (chd)