Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 16, Pages 8492-8498Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069887
Keywords
earthquake early warning; probabilistic inversion; neural networks
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Funding
- Netherlands Organization for Scientific Research (NWO) [854.10.002]
- NWO [SH-296-14]
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Despite the ever increasing availability of computational power, real-time source inversions based on physical modeling of wave propagation in realistic media remain challenging. We investigate how a nonlinear Bayesian approach based on pattern recognition and synthetic 3-D Green's functions can be used to rapidly invert strong-motion data for point source parameters by means of a case study for a fault system in the Los Angeles Basin. The probabilistic inverse mapping is represented in compact form by a neural network which yields probability distributions over source parameters. It can therefore be evaluated rapidly and with very moderate CPU and memory requirements. We present a simulated real-time inversion of data for the 2008 M-w 5.4 Chino Hills event. Initial estimates of epicentral location and magnitude are available approximate to 14s after origin time. The estimate can be refined as more data arrive: by approximate to 40s, fault strike and source depth can also be determined with relatively high certainty.
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