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Summary for Field Activity Number 1992-016-FA

Alternate Leg ID: 251

Area of Operations: Deep Water Dump Site DWDS 106, Continental Rise offshore New Jersey, New York, United States, North America, North Atlantic

Dates: July 20, 1992 to July 29, 1992

Objectives: Sidescan sonar imaging of the ocean bottom around the DWDS-106 Municipal Sludge dumpsite, for support of DSRV ALVIN dives and to characterize sea-floor microtopography.

Type of Activity:

Information to be derived:

Summary: AMS-120 sidescan unit with the Qmips processing system functioned very well, with only 4 hours lost when a wire termination failed apparently due to tow strumming. Site surveys were accomplished at 4 off-dumpsite sites, and two areas within the dumpsite study area were imaged and mosaicked while at sea. The data commonly show features indicating offshore-directed bottom flows. A control site (2600 m at 70 deg 40 min W) and 2 sampling sites SW of the main study area show a smooth ocean bottom, with minor flow indications, such as elongated moats or dune structures. Within the study area, in contrast, our 8-line mosaic shows striking offshore lineations, evidently erosional furrows (parts were observed last year using Jason), as well as smooth bottom where a tongue of muddy sediments overlies the furrowed surface. The furrows lie downslope from where canyons debouch. Also mosaicked with three lines was a rough area of greater relief and high backscatter that may be part of a large olistostrome (landslide block).

USGS Project Number: 9470-64042

Contact: Jim Robb (jrobb@usgs.gov)

InfoBank: uses the identifier O-51-92-NJ. Visit this site for more information.

Click to get Google Software - Download 92016.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:

Paper seismic/sidescan bottom profiles:

Inventory #LinesFolderStart TimeEnd TimeProfile TypeRemarks
046811-2 00109:49 07/21/199211:30 07/22/1992 3.5K-
046823-4 00211:44 07/22/199206:42 07/23/1992 3.5K-
046834,14 003: //: // 3.5K-
0468415-20 00407:45 07/26/199215:47 07/27/1992 3.5K-
0468521-24 00515:47 07/27/199201:08 07/29/1992 3.5K-
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