Seismic crustal structure and the elastic properties of rocks recovered by drilling in the Philippine Sea

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doi: 10.1029/GD011p0127
Author(s): Carlson, R. L.; Wilkens, R. H.
Author Affiliation(s): Primary:
Tex. A&M Univ., Dep. Geophys., College Station, TX, United States
Univ. Tokyo, Earthquake Res. Inst., Japan
Univ. Wash., Dep. Geol. Sci., United States
Volume Title: Geodynamics of the western Pacific-Indonesian region
Volume Author(s): Hilde, Thomas W. C., editor; Uyeda, Seiya
Source: Geodynamics of the western Pacific-Indonesian region, edited by Thomas W. C. Hilde and Seiya Uyeda. Geodynamics Series, Vol.11, p.127-136. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0277-6669. ISBN: 978-1-118-67036-1
Note: In English. 30 refs.; illus. incl. 3 tables, sketch map
Summary: Extensive deep drilling in the Philippine Sea has provided a variety of rock samples for laboratory studies of compressional and shear-wave velocities at in-situ confining pressures. Included are volcaniclastic sediments, breccias, basalts and gabbroic rocks. Because these lithologies correspond to the probable compositions of all major units of the oceanic crust, their seismic properties can be directly compared with the results of numerous seismic refraction surveys in the region. The properties of the gabbroic rocks compare well with layer 3 velocities (6.5-7 km/sec), and the basalt velocities generally correspond with the refraction velocities for layer 2 (4.5-5.3 km/sec). Velocities in the upper part of the oceanic crust (layer 1) in this region range from 2 to 4 km/sec. The laboratory velocities of vitric tuffs, breccias and vesicular basalts all fall within this range, suggesting that layer 1 in some areas of the Philippine Sea may include a significant volcanic component. Abstract Copyright 1983 American Geophysical Union.
Year of Publication: 1983
Research Program: DSDP Deep Sea Drilling Project
Key Words: 19 Geophysics, Seismology; Basins; Body waves; Crust; Deep Sea Drilling Project; Elastic properties; Elastic waves; Experimental studies; Igneous rocks; In situ; Marginal basins; North Pacific; Northwest Pacific; Pacific Ocean; Philippine Sea; Refraction; S-waves; Seismic waves; Seismology; Subduction zones; Velocity; Velocity structure; West Pacific
Coordinates: N080000 N320000 E1470000 E1240000
Record ID: 1985008647
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