Regression analysis of MCS intensity and ground motion spectral accelerations (SAs) in Italy

Details Regression analysis of MCS intensity and ground motion spectral accelerations (SAs) in Italy Regression analysis of MCS intensity and ground motion spectral accelerations (SAs) in Italy

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011geoji.186.1415f&link_type=abstract

Geophysical Journal International, Volume 186, Issue 3, pp. 1415-1430.

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Earthquake Ground Motions, Seismicity And Tectonics, Europe

Scientific paper

We present the results of the regression analyses between Mercalli-Cancani-Sieberg (MCS) intensity and the spectral acceleration (SA) at 0.3, 1.0 and 2.0 s (SA03, SA10 and SA20). In Italy, the MCS scale is used to describe the level of ground shaking suffered by manufactures or perceived by the people, and it differs to some extent from the Mercalli Modified scale in use in other countries. We have assembled a new SA/MCS-intensity data set from the DBMI04 intensity database and the ITACA accelerometric data bank. The SA peak values are calculated in two ways—using the maximum among the two horizontal components, and using the geometrical mean among the two horizontal components. The regression analysis has been performed separately for the two kinds of data sets and for the three target periods. Since both peak ground parameters and intensities suffer of appreciable uncertainties, we have used the orthogonal distance regression technique. Also, tests designed to assess the robustness of the estimated coefficients have shown that single-line parametrizations for the regressions are sufficient to model the data within the model uncertainties.

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