Skip Navigation
USGS - science for a changing world

Woods Hole Science Center

Skip Navigation

Summary for Field Activity Number 1990-033-FA

Alternate Leg ID: Endeavor 217

Area of Operations: Continental Shelf off Chesapeake Bay, Virginia, North Carolina, United States, North America, North Atlantic

Dates: September 07, 1990 to September 17, 1990

Objectives: Using OBSes and hydrophones, (1) determine an accurate two-dimensional velocity structure across the complete margin province, from pure continental to normal oceanic crust; (2) image the lower crust and moho beneath the marginal sedimentary pile that is invisible to conventional multichannel seismic reflection experiments; (3) undershoot the margin carbonate bank complex and volcaniclastic wedge that thus map the underlying structures; (4) establish the geometry of the moho across the margin; (5) determine the nature of rift stage crust; (6) characterize rifted continental crust; (7) determine the nature of marginal oceanic crust; and (8) constrain models for the source of the East Coast Magnetic Anomaly. These objectives will be accomplished through the following tasks: (1) Wire test 16 new EG&G acoustic transponder/releases. (2) Carry out test deployments of one OBH and one OBS to check suitability of the absolute gain settings. (3) Record absolute shot times accurate to ~1 ms on board GECO SEARCHER. (4) In coordination with the commercial seismic vessel GECO SEARCHER, deploy 12 ocean bottom seismic instruments along line A of the EDGE project's Chesapeake Bay transect. (5) Recover all instruments after recording all GECO SEARCHER's airgun shots along this line. (6) Redeploy three of these instruments to line B. (7) Coordinate shooting operations with deployment of land instuments by Scott Smithson of the U. of Wyoming and Bob Hawman of the University of Georgia.

Type of Activity:

Information to be derived:

Summary:

USGS Project Number: 9470-30080

Contact: Deborah Hutchinson (dhutchinson@usgs.gov)

InfoBank: uses the identifier E-7-90-CH. Visit this site for more information.

Click to get Google Software - Download 90033.kml to view this field activity in Google Earth

Map for Area of Operations :

Map of field activity boundary.

Platform Info:

The following materials for this field activity are available in the Information Archives:

Skip Navigation

USGS Coastal and Marine Geology Program

We are part of the USGS Coastal and Marine Geology Program. Please visit our other science centers at:

  1. St. Petersburg, FL
  2. Menlo Park, CA

or search our web sites:

Data Sites

Skip USGS links group

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USAGov logo U.S. Department of the Interior | U.S. Geological Survey
End of USGS links group
URL: quashnet.er.usgs.gov/data/1990/90033/index.html
Page Contact Information: WHSC Webmaster
Page Last Modified: Tuesday, 25-Nov-2014 15:06:09 EST