Bayesian ISOLA: new tool for automated centroid moment tensor inversion. Issue 2 (21st April 2017)

• Record Type: Journal Article
• Authors: Vackář, Jiří; Burjánek, Jan; Gallovič, František; Zahradník, Jiří; Clinton, John
• Is Part Of: Geophysical journal international. Volume 210:Issue 2(2017:Aug.)
• Page Start: 693
• Page End: 705
• Publication Date: 2017-04-21
• Subjects: Inverse theory -- Waveform inversion -- Computational seismology -- Earthquake source observations -- Seismic noise; Geophysics -- Periodicals; 550
• DOI: 10.1093/gji/ggx158
• Languages: English
• ISSNs: 0956-540X

Abstract

Abstract: We have developed a new, fully automated tool for the centroid moment tensor (CMT) inversion in a Bayesian framework. It includes automated data retrieval, data selection where station components with various instrumental disturbances are rejected and full-waveform inversion in a space–time grid around a provided hypocentre. A data covariance matrix calculated from pre-event noise yields an automated weighting of the station recordings according to their noise levels and also serves as an automated frequency filter suppressing noisy frequency ranges. The method is tested on synthetic and observed data. It is applied on a data set from the Swiss seismic network and the results are compared with the existing high-quality MT catalogue. The software package programmed in Python is designed to be as versatile as possible in order to be applicable in various networks ranging from local to regional. The method can be applied either to the everyday network data flow, or to process large pre-existing earthquake catalogues and data sets.