Abstract
A large database of ground motions from shallow earthquakes occurring in active tectonic regions around the world, recently developed in the Pacific Earthquake Engineering Center’s NGA-West2 project, has been used to investigate what such a database can say about the properties and processes of crustal fault zones. There are a relatively small number of near-rupture records, implying that few recordings in the database are within crustal fault zones, but the records that do exist emphasize the complexity of ground-motion amplitudes and polarization close to individual faults. On average over the whole data set, however, the scaling of ground motions with magnitude at a fixed distance, and the distance dependence of the ground motions, seem to be largely consistent with simple seismological models of source scaling, path propagation effects, and local site amplification. The data show that ground motions close to large faults, as measured by elastic response spectra, tend to saturate and become essentially constant for short periods. This saturation seems to be primarily a geometrical effect, due to the increasing size of the rupture surface with magnitude, and not due to a breakdown in self similarity.
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Acknowledgments
I thank Yehuda Ben-Zion and Antonio Rovelli for the invitation to attend the 40th Workshop of the International School of Geophysics on PROPERTIES AND PROCESSES OF CRUSTAL FAULT ZONES in Erice, Sicily, Italy, May 18–24, 2013, and for the encouragement to prepare a paper based on my talk. I also thank Joe Fletcher, Tony Shakal, and Paul Spudich for providing figures, Chris Dietel for corrected station coordinates for the GEOS stations, and Annemarie Baltay, Carola Di Alessandro, Tom Hanks, and an anonymous person for constructive reviews that led to significant improvements in the article.
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Boore, D.M. What Do Data Used to Develop Ground-Motion Prediction Equations Tell Us About Motions Near Faults?. Pure Appl. Geophys. 171, 3023–3043 (2014). https://doi.org/10.1007/s00024-013-0748-9
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DOI: https://doi.org/10.1007/s00024-013-0748-9