Seismic Source Parameters from Regional Paleoseismic Evidence
Publication: Geo-Congress 2022
ABSTRACT
Historic earthquake catalogs are, in many regions, insufficient to constrain seismic source locations and magnitude–frequency relations, which are needed for seismic-hazard analyses. As a result, analyses of relic coseismic evidence, such as landslides, rockfall, and liquefaction, must often be used to infer information about the seismic hazard. However, while such studies are performed widely, they have tended to focus more on field identification, dating, and ascription of evidence to a seismic cause, with less effort focused on advancing the techniques for inverse-analyzing field evidence to elucidate the seismic-source model. Accordingly, this paper proposes a general inversion framework by which seismic source parameters are probabilistically constrained from paleoseismic evidence. Analyzing evidence at regional scale leads to (1) a geospatial likelihood surface that constrains the causative rupture location; and (2) a probability distribution of the rupture magnitude, each being direct inputs to probabilistic seismic hazard analyses. Simulated paleoseismic studies are performed on modern earthquakes with known seismic parameters. These simulations demonstrate the utility and efficacy of the proposed framework, which has the potential to provide new insights in enigmatic seismic zones worldwide.
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Geo-Congress 2022
Pages: 411 - 420
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Published online: Mar 17, 2022
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