Faulted Structure of the Bottom Simulating Reflector on the Blake Ridge, Western North Atlantic

High-resolution multichannel seismic data collected from the Blake Ridge in the western North Atlantic by the Naval Research Laboratory's Deep Towed Acoustics/Geophysics System (DTAGS) show that the bottom simulating reflector (BSR) in this area is the reflection from the interface between an a...

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Bibliographic Details
Main Authors: Rowe, M. M., Gettrust, J. F.
Other Authors: NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
Format: Text
Language:English
Published: 1993
Subjects:
Physical and Dynamic Oceanography
Acoustics
*FAULTS(GEOLOGY)
*SEISMIC DATA
*AMBIENT NOISE
TEMPERATURE
SCATTERING
INTERFACES
LAYERS
TOWED ARRAYS
RESOLUTION
PHASE
GEOPHYSICS
METHANE
OCEANS
NOISE
BEARINGS
MIGRATION
NAVAL RESEARCH
PRESSURE
SEISMOMETERS
RIDGES
MULTICHANNEL
DIRECTIONAL
HORIZON
OCEAN BOTTOM
REFLECTORS
SEDIMENTS
BOTTOM
DISCONTINUITIES
BOUNDARIES
REGIONS
PATHS
ARRAYS
REFLECTION
HIGH RESOLUTION
HYDRATES
PE62435N
WUDN259007
Methane hydrate
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA271289
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA271289
Description
Summary:High-resolution multichannel seismic data collected from the Blake Ridge in the western North Atlantic by the Naval Research Laboratory's Deep Towed Acoustics/Geophysics System (DTAGS) show that the bottom simulating reflector (BSR) in this area is the reflection from the interface between an approx. 440-m-thick section of hydrate bearing sediment overlying and approx. 5- m-thick layer of methane gas-rich sediment. The high resolution attainable by the deep-tow seismic system reveals normal fault offsets of approx. 20 m in the BSR. These growth faults may provide a path for vertical migration of methane initially concentrated beneath the hydrate-bearing sediment, enabling hydrate to form throughout sediment above the BSR. Because the BSR represents a methane gas methane hydrate phase boundary rather than a lithologic or diagenetic horizon, the observed off set of the BSR itself reflects discontinuities in the pressure- temperature field across the fault zones where they intersect the BSR. Directional ambient noise, Bottom scattering, Deep-towed array geophysical system, Ocean-bottom seismometer, Towed array. Pub. in Geology, v21 p833-836 Sep 1993. v1 n2 p143-153, 1993.

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