Orientation-Independent Measures of Ground Motion for a Database of Central America.
Abstract eng: Ground Motion Prediction Equations commonly use response spectra as input data. However, the selection of a unique spectral function which minimizes the error between predicted and observed values, remains a subject of research. Recently, response spectra independent of the sensors orientation have been used in seismic hazard studies, showing a reduction in the error of the predictive equations. Nevertheless, the use of response spectra determined from the geometric mean of the horizontal orthogonal response spectra is in debate. In particular, when it is convenient to know about the maximum spectral accelerations expected. In this paper, different Orientation-Independent Measures are calculated for a Strong Motion Data Base of Central America. A total of 1406 strong motion records with 3 orthogonal acceleration time series are used. For this database, the median value of the ratio between the maximum spectral response with orientation of the sensors independence and the one of the geometric mean of the as-recorded spectral response varies as a function of the period, with a minimum of 1.22 at 0.1 seconds and a maximum of 1.3 at periods greater than 1 second. A new approach, for determining the maximum Orientation-Independent spectral response, which is based on the Root-Sum-of-Squares, is probed.
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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Record created 2017-01-18, last modified 2017-01-18
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