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DEPARTMENT OF EARTH AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139
INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS SCRIPPS INSTITUTION OF OCEANOGRAPHY UNIVERSITY OF CALIFORNIA, SAN DIEGO, LA JOLLA, CALIFORNIA 92093
Abstract
For three sediment-filled valleys, average site responses were experimentally determined and found to apply, to within ±0.25 log units, to earthquakes at any azimuth and to S waves and coda waves; for one of these valleys, ground accelerations were measured over the range 10–5 to 0.2 g, and no significant differences in site responses were apparent. In two valleys with sediment-basement impedance contrasts of 5:1 and 6:1, average site amplification is as much as a factor of five in certain frequency bands. In another valley, with a sediment-basement impedance contrast of 3:1, sediment amplification is about a factor of two. The duration of motion on the valley sediments, in narrow frequency bands, is equal to that on the bordering rock, implying that the observed amplification is not due to a high-Q resonance of the sediments.
Footnotes
* Present address: California Division of Mines and Geology, 2815 "O" Street, Sacramento, California 95816.
Present address: Electric Power Research Institute, P.O. Box 10412, Palo Alto, California 94303.
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