Determining "Ground Truth" in the New Jersey STRATAFORM Natural Laboratory
Final technical rept. 1 Oct 1998-30 Sep 2000
TEXAS UNIV AT AUSTIN INST FOR GEOPHYSICS
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UTIG is integrating nested seismic data off New Jersey with subsurface samples, as they become available. This STRATAFORM goal is elusive, because ground-truthing of seismic sequence boundaries and intervening facies by sampling at relevant depths is incomplete Objectives remain 1 to study sea-level changes over the past 35 Ma, and 2 to determine the effects of depositional and erosional processes on the preserved sediment record, from the seafloor to subbottom depths of lOO m. A comprehensive characterization of the uppermost middle-outer New Jersey shelf is underway, building upon multibeam backscatterbathymetric seafloor images and 2D3D ultra-high resolution geophysical control. Results from ODP Leg l74A 1997 are published see httpwww-odp.tamu.edupublications. Since UTIG collected 3D Huntec data on the New Jersey shelf1989, the primary continuing activity has been ground-truthing surficial images. Short piston cores were acquired after the 1989 survey short vibra-cores were collected in association with a second 3D survey in 1993 long coring is now being pursued as part of Geoclutter.