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Studies of crustal converted waves using short-period seismograms recorded in the Vanuatu Island arc

JER-MING CHIU^*, BRYAN L. ISACKS and RICHARD K. CARDWELL

DEPARTMENT OF GEOLOGICAL SCIENCES CORNELL UNIVERSITY, ITHACA, NEW YORK 14853

Abstract

On three-component, short-period, digital array recordings, S to P converted phases from three major crustal discontinuities beneath Efate Island are identified between the primary P and S arrivals. The time differences between the main S arrival and these converted phases (Sp1, Sp2, and Sp3) provide constraints on the crustal structure beneath Efate Island. A crustal model with three layers over a half-space is determined, which is consistent with the results of a published refraction experiment in the southern Vanuatu (formerly New Hebrides) island arc.

Footnotes

^* Present address: Tennessee Earthquake Information Center, Memphis State University, Memphis, Tennessee 38152.

Present address: Sohio Petroleum Company, 50 Fremont, 25th Floor, San Francisco, California 94105.

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