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Empirical Models of Shear-Wave Radiation Pattern Derived from Large Datasets of Ground-Shaking Observations.

Abstract：

:Shear-waves are the most energetic body-waves radiated from an earthquake, and are responsible for the destruction of engineered structures. In both short-term emergency response and long-term risk forecasting of disaster-resilient built environment, it is critical to predict spatially accurate distribution of shear-wave amplitudes. Although decades' old theory proposes a deterministic, highly anisotropic, four-lobed shear-wave radiation pattern, from lack of convincing evidence, most empirical ground-shaking prediction models settled for an oversimplified stochastic radiation pattern that is isotropic on average. Today, using the large datasets of uniformly processed seismograms from several strike, normal, reverse, and oblique-slip earthquakes across the globe, compiled specifically for engineering applications, we could reveal, quantify, and calibrate the frequency-, distance-, and style-of-faulting dependent transition of shear-wave radiation between a stochastic-isotropic and a deterministic-anisotropic phenomenon. Consequent recalibration of empirical ground-shaking models dramatically improved their predictions: with isodistant anisotropic variations of ±40%, and 8% reduction in uncertainty. The outcomes presented here can potentially trigger a reappraisal of several practical issues in engineering seismology, particularly in seismic ground-shaking studies and seismic hazard and risk assessment.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kotha SR,Cotton F,Bindi D

doi

10.1038/s41598-018-37524-4

subject

Has Abstract

pub_date

2019-01-30 00:00:00

pages

981

issue

1

issn

2045-2322

pii

10.1038/s41598-018-37524-4

journal_volume

9

pub_type

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