Geologic Features of the Sea Bottom Around a
Municipal Sludge Dumpsite near 39°N, 73°W,
Offshore New Jersey and New York: U.S. Geological Survey Open-file
Report 94-152
Mounded sediment deposits at the base of the continental slope, the
faults and blocky strata observed in seismic reflection profiles, and
the irregular surface morphology of the continental rise, with hills
and hillocks, small mounds, boulders and depressions, all can be
attributed to submarine landslides that originated on the continental
slope. Many separate events or episodes of deposition have taken
place, recorded by surface sediments and morphology. Material has been
transported across the upper rise by sediment gravity flows through
broad low regions. However, the frequency and intensity of the
processes that emplaced the present surface deposits, and the causes
and triggering mechanisms of mass movements remain to be determined.
Whereas variable thickness and faulting in the subsurface strata at the
base of the slope show that localized deposition by episodic mass
movement and subsequent slumping has been an ongoing process of
upper-rise formation, the more current question is how active the
region has been historically, post Pleistocene, and what activity is
likely to occur in the future.
- To recapitulate, click on:
- Abstract...
- Introduction...
- Data and Methods...
- (Bathymetric map)
- (GLORIA mosaic)
- Description of the sea floor...
- Discussion...
- Conclusions...
- References Cited...
- Illustrations Summary
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