Suggested directions in earthquake shaking microzonation research
Tinsley, J.C.; Rogers, A.M.
Workshop on future directions in evaluating earthquake hazards of Southern California, November 12-13, 1985, Los Angeles, California: 345-354
Rogers, Tinsley, and Borcherdt (1985) described an empirical technique for predicting relative site response by comparing ground motion spectra in three period bands (total period band is from 0.2 to 10 seconds) relative to the thickness and the physical properties of the earth materials which lie beneath the instrument sites. A set of three-component recordings of Nevada Test Site nuclear tests and a compilation of geologic attributes at each site comprise the set of basic data employed in the analysis. A suite of site types (clusters) is defined statistically in terms of common geologic attributes. The attributes defining each cluster are those attributes that most strongly correlate with, or influence, site response in a given period band. Maps showing the distribution of these geologic attributes are prepared as overlays and are used to construct derivative maps which, in turn, depict relative site response for part of the Los Angeles area. Future research is desirable, both to explore further the methodology and to test the predictions of the model compared to patterns of damage caused by historical earthquakes, as well as applying the technique to basins other than the Los Angeles region. The principal goal of these and related studies is to develop microzonation technology so that sites which are especially at risk can be identified and appropriate measures can be adopted to reduce significantly losses of life and property.