HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by LUETGERT, J. H. Articles by MOONEY, W. D. Search for Related Content GeoRef GeoRef Citation

Crustal refraction profile of the Long Valley caldera, California, from the January 1983 Mammoth Lakes earthquake swarm

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MS 77 MENLO PARK, CALIFORNIA 94025

Abstract

Seismic-refraction profiles recorded north of Mammoth Lakes, California, using earthquake sources from the January 1983 swarm complement earlier explosion refraction profiles and provide velocity information from deeper in the crust in the area of the Long Valley caldera. Eight earthquakes from a depth range of 4.9 to 8.0 km confirm the observation of basement rocks with seismic velocities ranging from 5.8 to 6.4 km/sec extending at least to depths of 20 km. The data provide further evidence for the existence of a partial melt zone beneath Long Valley caldera and constrain its geometry. This evidence is in the form of pronounced secondary arrivals, which we interpret as waves that have propagated through a volume with low Q (the magma chamber) and reflected from the lower boundary of the southern edge of this volume at depths of 18 to 20 km.

This article has been cited by other articles:

				W. A. PEPPIN, T. W. DELAPLAIN, and J. S. LEWIS Pre-S observations at station SLK, NW of Long Valley caldera, California, and their relation to possible magma bodies Bulletin of the Seismological Society of America, December 1, 1989; 79(6): 1894 - 1904. [Abstract] [PDF]

				J. J. ZUCCA, P. W. KASAMEYER, and J. M. MILLS JR< Observation of a reflection from the base of a magma chamber in Long Valley Caldera, California Bulletin of the Seismological Society of America, October 1, 1987; 77(5): 1674 - 1687. [Abstract] [PDF]

				G. A. MCMECHAN, J. H. LUETGERT, and W. D. MOONEY Imaging of earthquake sources in Long Valley Caldera, California, 1983 Bulletin of the Seismological Society of America, August 1, 1985; 75(4): 1005 - 1020. [Abstract] [PDF]