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Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites

Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites
Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites
The reduction of six wide-angle reflection profiles shot within the two fault blocks visited by Ocean Drilling Program (ODP) Leg 116 in combination with the ODP sonic logs has produced a velocity-depth structure for this area. The sediment velocity increases from 1.6-1.7 km/s in the near surface to 3.4-3.5 km/s immediately above basement with a velocity gradient of 0.75/s. A depth converted seismic reflection profile suggests that the pre-deformational basement surface was similar to the abyssal hill topography developed in the Pacific Ocean. A velocity for the top of oceanic layer 2 of 4.1 km/s was identified as layer 2A. Assuming a velocity gradient of 0.7/s, an estimate of layer 2 thickness was obtained of 1.5 km. It is possible to interpret residual depth anomalies in terms of a layer 3 that may be thinner than for normal oceanic crust.
311-316
Texas A & M University Ocean Drilling Program
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Scrutton, Roger A.
390958b5-26fb-4588-bb56-b77b080fd568
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Scrutton, Roger A.
390958b5-26fb-4588-bb56-b77b080fd568

Bull, Jonathan M. and Scrutton, Roger A. (1990) Sediment velocities and deep structure from wide-angle reflection data around Leg 116 sites. In, Proceeding of the Ocean Drilling Program Scienllfic Results, Vol. 116, Distal Bengal Fan : covering Leg 116 of the cruises of the Drilling Vessel "Joides Resolution", Colombo, Sri Lanka, to Colombo, Sri Lanka, Sites 17-719, 2 July 1987-19 Aug 1987. College Station, TX, US. Texas A & M University Ocean Drilling Program, pp. 311-316.

Record type: Book Section

Abstract

The reduction of six wide-angle reflection profiles shot within the two fault blocks visited by Ocean Drilling Program (ODP) Leg 116 in combination with the ODP sonic logs has produced a velocity-depth structure for this area. The sediment velocity increases from 1.6-1.7 km/s in the near surface to 3.4-3.5 km/s immediately above basement with a velocity gradient of 0.75/s. A depth converted seismic reflection profile suggests that the pre-deformational basement surface was similar to the abyssal hill topography developed in the Pacific Ocean. A velocity for the top of oceanic layer 2 of 4.1 km/s was identified as layer 2A. Assuming a velocity gradient of 0.7/s, an estimate of layer 2 thickness was obtained of 1.5 km. It is possible to interpret residual depth anomalies in terms of a layer 3 that may be thinner than for normal oceanic crust.

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Published date: 1990
Organisations: Geology & Geophysics

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Local EPrints ID: 346543
URI: https://eprints.soton.ac.uk/id/eprint/346543
PURE UUID: 310f396e-fabe-46e3-bf16-d216e39492c0

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Date deposited: 02 Jan 2013 10:33
Last modified: 18 Jul 2017 05:03

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Author: Roger A. Scrutton

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