Bayesian Estimation of the Spatially Varying Completeness Magnitude of Earthquake Catalogs

NCUIR > College of Earth Sciences > Department of Earth Sciences > journal & Dissertation > Item 987654321/50558

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50558

Title:	Bayesian Estimation of the Spatially Varying Completeness Magnitude of Earthquake Catalogs
Authors:	Mignan,A;Werner,MJ;Wiemer,S;Chen,CC;Wu,YM
Contributors:	地球科學系
Keywords:	1999 CHI-CHI;WESTERN UNITED-STATES;DETECTION CAPABILITY;MINIMUM MAGNITUDE;SEISMIC NETWORK;DATA ASSIMILATION;B-VALUE;TAIWAN;JAPAN;THRESHOLD
Date:	2011
Issue Date:	2012-03-27 17:36:45 (UTC+8)
Publisher:	國立中央大學
Abstract:	Assessing the completeness magnitude M(c) of earthquake catalogs is an essential prerequisite for any seismicity analysis. We employ a simple model to compute M(c) in space based on the proximity to seismic stations in a network. We showthat a relationship of the form M(c)(pred) (d) = ad(b) + 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 M(c) 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 M(c) estimates and (2) a Bayesian approach that merges prior information about M(c) based on the proximity to seismic stations with locally observed values weighted by their respective uncertainties. Contrary to the current M(c) 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 M(c). 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.
Relation:	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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