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Observation of 1- to 5-second microtremors and their application to earthquake engineering. Part III. A two-dimensional study of site effects in the San Fernando Valley

FACULTY OF ENGINEERING HOKKAIDO UNIVERSITY, N13 W8, SAPPORO 060, Japan
SCHOOL OF ENGINEERING AND APPLIED SCIENCE UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIFORNIA 90024
FACULTY OF ENGINEERING TOKYO METROPOLITAN UNIVERSITY, 2-1 FUKASAWA, SETAGAYA-KU TOKYO 158, Japan
DEPARTMENT OF MECHANICAL ENGINEERING UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CALIFORNIA 90089-1453

Abstract

A two-dimensional study of the influence of deep sediment on seismic ground motions was conducted by recording and analyzing long-period microtremors in the San Fernando Valley, California. The recordings were made at 50 regularly distributed sites in the valley. Three reference sites were employed at the baserock outcrop around the valley so as to observe the time-dependent characteristics of the microtremors.

1. Amplitudes in a period range of several seconds correlate with the thicknesses of the sedimentary layers.

2. A site amplification effect, which was evaluated in terms of sediment-to-rock spectral ratios, is qualitatively consistent with available geological and strong motion data.

3. The practical field observation procedure designed for this study, the two-dimensional approach, can be easily used in other surveys for estimating the spatial characteristics of earthquake ground motions in the period range of several seconds.

Footnotes

^* Present address: School of Civil Engineering, Oklahoma State University, Stillwater, Oklahoma 74078.

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