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Summary for Field Activity Number 1985-031-FA

Alternate Leg ID: DISC-85-2

Area of Operations: central Chesapeake Bay, United States, North America, North Atlantic

Dates: September 17, 1985 to September 24, 1985

Objectives: Collect high-resolution seismic reflection and sidescan sonar data in order to define the geology and shallow structure of the Chesapeake Bay.

Type of Activity: Seismic profiling

Information to be derived: High-resolution seismic reflection and sidescan sonar data

Summary: The cruise was quite successful, despite being cut three days short because of Hurricane Gloria. A total of 280 nm (518 km) of tracklines was covered. Except for the hurricane, weather was excellent with several flat-calm days. The seismic reflection records obtained were very good except in local areas where the sediments contained biogenic gas. Penetration achieved by the seismic signals was mostly 100 msec or more, and the records clearly show the entire Quaternary and upper part of the Tertiary sequence of deposits. Multiple overlapping channels and channel-fill deposits related to major fluctuations in sea level were observed.

USGS Project Number: CHESAPKE

Contact: Steve Colman (scolman@usgs.gov)

InfoBank: uses the identifier D-2-85-CH. Visit this site for more information.

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:

Paper seismic/sidescan bottom profiles:

Inventory #LinesFolderStart TimeEnd TimeProfile TypeRemarks
0408278,27A,27B,27 00108:29 09/18/198513:45 09/18/1985 SSS-
0408280,80A 00113:14 09/17/198519:05 09/17/1985 SSS-
0408327,28,79 00213:45 09/18/198511:17 09/19/1985 SSS-
0408379,77A,77,77B,* 00211:25 09/19/198516:30 09/19/1985 SSS- *76A
0408475,70 00314:00 09/20/198510:35 09/21/1985 SSS-
0408474,76A,76,75A,* 00308:14 09/20/198513:55 09/20/1985 SSS- *75
0408580,TEST 00112:11 09/17/198517:06 09/17/1985 3.5K-
0408574,76,75A,75 00215:21 09/18/198515:28 09/20/1985 3.5K*- *&200K
0408578,27A,27B,27 00208:25 09/18/198515:21 09/18/1985 4.8K*- *&3.5K
0408580,80A 00116:00 09/17/198519:05 09/17/1985 4.8K*- *&3.5K
0408527,28,79,77,* 00215:21 09/18/198516:30 09/19/1985 3.5K*- *200K*77B,76A
04086200-204 00209:00 09/23/198505:15 09/23/1985 3.5K*- *&200K
0408628,69,69A,68,* 00208:30 09/24/198517:06 09/24/1985 3.5K*- *&200K*26
0408670,70A,71,71A,* 00208:03 09/21/198516:50 09/21/1985 3.5K*- *&200K*29A,29B
0408670,70A,71,71A,* 00208:03 09/21/198516:37 09/22/1985 3.5K*- *&200K*29A,29B,72,72A,73,29
0408780TEST,80 00113:15 09/17/1985??:?? 09/17/1985 GEOP-
0408780,80A,78,27A,* 00117:29 09/17/198516:19 09/18/1985 GEOP- *27B,27
0408728,79,77A,77,* 00108:21 09/19/198515:28 09/20/1985 GEOP- 77B,74,76A,76,75A,75
0408870,70A,71,71A,* 00208:03 09/21/198515:30 09/22/1985 GEOP- *29A,29B,72,72A,73,29
04089200 00309:03 09/23/198509:30 09/23/1985 GEOP-
04089200 00309:35 09/23/198511:00 09/23/1985 GEOP-
04089200 00311:03 09/23/198512:26 09/23/1985 GEOP-
04089201 00312:27 09/23/198513:42 09/23/1985 GEOP-
04089202,203 00313:43 09/23/198514:48 09/23/1985 GEOP-
04089204 00314:49 09/23/198515:17 09/23/1985 GEOP-
0408929 00315:33 09/22/198516:37 09/22/1985 GEOP-
0408928,69,69A,68,26 00308:32 09/24/198517:06 09/24/1985 GEOP-
0408929,200-204,28,* 00315:33 09/22/198517:06 09/24/1985 GEOP- *69,69A,68,26
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