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Bulletin of the Seismological Society of America; August 1990; v. 80; no. 4; p. 889-912
© 1990 Seismological Society of America
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Source parameters and effects of bandwidth and local geology on high-frequency ground motions observed for aftershocks of the northeastern Ohio earthquake of 31 January 1986

GARY GLASSMOYER and ROGER D. BORCHERDT

UNITED STATES GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD—MS 977, MENLO PARK, CALIFORNIA 94025

Abstract

A 10-station array (GEOS) yielded recordings of exceptional bandwidth (400 sps) and resolution (up to 96 dB) for the aftershocks of the moderate (mb {approx} 4.9) earthquake that occurred on 31 January 1986 near Painesville, Ohio. Nine aftershocks were recorded with seismic moments ranging between 9 x 1016 and 3 x 1019 dyne-cm (Mw: 0.6 to 2.3). The two largest aftershocks (depth 5.3, 5.6 km; oblique right slip, rake {approx}30°, strike {approx}N25°E) yielded seismic signals above background noise at frequencies as high as 130 Hz at epicentral distances up to 17 km. The aftershock recordings at a site underlain by {approx}8 m of lakeshore sediments show significant levels of high-frequency soil amplification of vertical motion at frequencies near 8, 20, and 70 Hz. Viscoelastic models for P and SV waves incident at the base of the sediments yield estimates of vertical P-wave response consistent with the observed high-frequency site resonances, but suggest additional detailed shear-wave logs are needed to account for observed S-wave response. Peak acceleration values obtained from the broadband recordings are about two and four times as large as those that would be recorded on strong-motion recorders or short-period networks with upper bandwidth limits of 30 and 15 Hz, respectively. Attenuation-corrected acceleration spectra are used to reduce the influence of high-frequency (up to 100 Hz) local site effects on corner frequency estimates. The moment versus source radius trend inferred for events with moments as small as 9 x 1016 dyne-cm, based on the Brune source model, extends previous relations inferred for the central United States, shows little evidence for a minimum source radius, and suggests that stress drops for the smaller events (M0 < 1019 dyne-cm) decrease with decreasing moment.




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