Fine Structure of Methane Hydrate-Bearing Sediments on the Blake Outer Ridge as Determined from Deep-Tow Multichannel Seismic Data

High-resolution, deep-tow multichannel seismic data are used to investigate the detailed structure of sediments containing methane hydrate. These data support thick, laterally extensive layers of methane hydrate-bearing sediment underlain by a bottom simulating reflector (BSR) and spatially disconti...

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Bibliographic Details
Main Authors: Rowe, M. M., Gettrust, J. F.
Other Authors: NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN SCIENCES BRANCH
Format: Text
Language:English
Published: 1993
Subjects:
Organic Chemistry
Physical and Dynamic Oceanography
Seismology
*HYDRATES
*SEISMIC DATA
*ACOUSTIC SCATTERING
*SEDIMENTS
*METHANE
*OCEAN BOTTOM
REPRINTS
SCATTERING
TOWED ARRAYS
LOW VELOCITY
PRESSURE
SEISMOMETERS
MULTICHANNEL
OCEAN RIDGES
REFLECTORS
OCEAN BOTTOM TOPOGRAPHY
SEISMIC VELOCITY
AMBIENT NOISE
HYDROPHONES
INVERSION
ACOUSTIC ARRAYS
SURFACES
FAULTS(GEOLOGY)
HIGH RESOLUTION
DEPTH
METHANE HYDRATE
MARINE SEDIMENTS
BLAKE OUTER RIDGE
DIRECTIONAL AMBIENT NOISE
BOTTOM SCATTERING
DEEP-TOWED ARRAYS
GEOPHYSICAL SYSTEM
OCEAN BOTTOM SEISMOMETERS
PE0602435N
PE0601153N
WU13620H
Methane hydrate
Online Access:http://www.dtic.mil/docs/citations/ADA262041
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA262041
Description
Summary:High-resolution, deep-tow multichannel seismic data are used to investigate the detailed structure of sediments containing methane hydrate. These data support thick, laterally extensive layers of methane hydrate-bearing sediment underlain by a bottom simulating reflector (BSR) and spatially discontinuous zones of hydrate within the sediments above the BSR depth where no BSR is present. These data resolve normal faults which extend from the surface through the BSR with apparent offsets of up to 20 m. A phase inversion identified at the top of the BSR shows that the material immediately beneath the BSR has anomalously low velocity, consistent with a layer of sediment containing free methane gas. The fault offsets along the BSR and consistent with a pressure change of approx. 200 kPa (approx. 2 bars) across the fault zone. Accession No. DN259007. Pub. in Jnl. of Geophysical Research, v98 nB1 p463-473, 10 Jan 1993. Original contains color plates: All DTIC reproductions will be in black and white. Sponsored in part by Office of Naval Research.

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