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Evidence for the existence of locally-generated body waves in the short-period noise at the Large Aperture Seismic Array, Montana

NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025

Abstract

The approximate hexagonal configuration of LASA subarrays enables their use as omnidirectional arrays. This property is used to study the phase velocity of short-period seismic noise at different frequencies. It is found that the noise in the low-frequency band consists mainly of surface waves traveling with average velocities in the range 3.0 to 3.5 km/sec. The high-frequency noise, in the band 0.45 to 1.0 Hz, has an average velocity of about 6.0 km/sec. It is quite likely that the high-frequency noise has the nature of locally-generated body waves. Statistical analysis of P_g velocities observed during a crustal refraction experiment at LASA lends support to this hypothesis.

This article has been cited by other articles:

				A. M. DAINTY and D. B. HARRIS Phase velocity estimation of diffusely scattered waves Bulletin of the Seismological Society of America, August 1, 1989; 79(4): 1231 - 1250. [Abstract] [PDF]