Bayesian estimation of the spatially varying completeness magnitude of earthquake catalogs

A. Mignan, M. J. Werner, S. Wiemer, C. C. Chen, Y. M. Wu

研究成果: 雜誌貢獻期刊論文同行評審

118 引文 斯高帕斯(Scopus)

摘要

Assessing the completeness magnitude Mc of earthquake catalogs is an essential prerequisite for any seismicity analysis. We employ a simple model to compute Mc in space based on the proximity to seismic stations in a network.We showthat a relationship of the form Mcpred(d) = adb + c, with d the distance to the kth nearest seismic station, fits the observations well, k depending on the minimum number of stations being required to trigger an event declaration in a catalog. We then propose a new Mc mapping approach, the Bayesian magnitude of completeness (BMC)method, based on a two-step procedure: (1) a spatial resolution optimization to minimize spatial heterogeneities and uncertainties in Mc estimates and (2) a Bayesian approach that merges prior information about Mc based on the proximity to seismic stations with locally observed values weighted by their respective uncertainties. Contrary to the current Mc mapping procedures, the radius that defines which earthquakes to include in the local magnitude distribution is chosen according to an objective criterion, and there are no gaps in the spatial estimation of Mc. The method solely requires the coordinates of seismic stations. Here, we investigate the Taiwan Central Weather Bureau (CWB) seismic network and earthquake catalog over the period 1994-2010.

原文???core.languages.en_GB???
頁(從 - 到)1371-1385
頁數15
期刊Bulletin of the Seismological Society of America
101
發行號3
DOIs
出版狀態已出版 - 1 6月 2011

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