Heat-flow and lateral seismic-velocity heterogeneities near Deep Sea Drilling Project-Ocean Drilling Program Site 504

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doi: 10.1130/0091-7613(1991)019<1141:HFALSV>2.3.CO;2
Author(s): Lowell, Robert P.; Stephen, Ralph A.
Author Affiliation(s): Primary:
Ga. Inst. Technol., Sch. Earth and Atmos. Sci., Atlanta, GA, United States
Other:
Woods Hole Oceanogr. Inst., United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 19(11), p.1141-1144. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 28 refs.; sketch maps
Summary: Both conductive heat-flow and seismic-velocity data contain information relating to the permeability of the oceanic crust. Deep Sea Drilling Project-Ocean Drilling Program Site 504 is the only place where both detailed heat-flow and seismic-velocity field studies have been conducted at the same scale. In this paper we examine the correlation between heat flow and lateral heterogeneities in seismic velocity near Site 504. Observed heterogeneities in seismic velocity, which are thought to be related to variations in crack density in the upper 500 m of the basaltic crust, show little correlation with the heat-flow pattern. This lack of correlation highlights some of the current difficulties in using seismic-velocity data to infer details of spatial variations in permeability that are significant in controlling hydrothermal circulation.
Year of Publication: 1991
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Body waves; Boreholes; Crust; DSDP Site 504; Deep Sea Drilling Project; East Pacific; Elastic waves; Equatorial Pacific; Fractures; Geophysical surveys; Heat flow; IPOD; Lateral heterogeneity; Leg 111; Leg 137; Leg 140; Leg 148; Leg 69; Leg 70; Leg 83; Leg 92; Mechanical properties; Ocean Drilling Program; Oceanic crust; P-waves; Pacific Ocean; Permeability; Seismic logging; Seismic waves; South American Pacific; South Pacific; Southeast Pacific; Surveys; Tectonophysics; Thermomechanical properties; Velocity structure; Well-logging
Coordinates: N011335 N011335 W0834356 W0834356
Record ID: 1991047323
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