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- W2182866420 abstract "The Deep Sea Drilling Project, in addition to providing valuable information on the history and processes of development of the ocean, has significantly contributed to our knowledge of the chemical and physical nature of the upper oceanic crust. Among the important physical properties of the crust are its seismic velocity and structure, the interpretation of which requires laboratory studies of seismic velocities in oceanic rocks. Velocities that have been reported for rocks from the Deep Sea Drilling Project include shipboard measurements at low pressures using the Hamilton Frame velocimeter, as well as land-based laboratory measurements at elevated confining pressures. The latter velocities are particularly useful for comparison with seismic refraction data from Layers 2 and 3, since laboratory velocities often show a pronounced change with confining pressure. Velocities reported at elevated pressures for rocks from the Deep Sea Drilling Project are summarized by Christensen and Salisbury (1975) and Christensen (1977). To date most of the measurements have been made on basalts recovered from main ocean basins, and only few data are available for rocks from back-arc basins. Just as the petrology of main ocean basin and back-arc basin rocks may differ (Hawkins, 1977), the physical properties may show significant differences for rocks from these two tectonic provinces. To examine this question, we have studied a number of basalts obtained on DSDP Leg 60 from Sites 454 and 458 in the Mariana Trough and fore-arc region (Fig. 1). In addition, the availability of downhole logs for Site 454 increases the importance of laboratory velocity studies under in situ conditions." @default.
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- W2182866420 date "1981-01-01" @default.
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- W2182866420 title "48. SEISMIC VELOCITIES AT ELEVATED PRESSURES OF IGNEOUS ROCKS FROM THE MARIANA TROUGH AND FORE-ARC REGION, DEEP SEA DRILLING PROJECT LEG 601" @default.
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