Automated full moment tensor inversion of coal mining-induced seismicity

Sen, A. T., Cesca, S., Bischoff, M., Meier, T. and Dahm, T. (2013) Automated full moment tensor inversion of coal mining-induced seismicity Geophysical Journal International, 195 (2). pp. 1267-1281. DOI 10.1093/gji/ggt300.

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Abstract

Seismicity induced by coal mining in the Ruhr region, Germany, has been monitored continuously over the last 25 yr. In 2006, a dense temporary network (HAMNET) was deployed to locally monitor seismicity induced by longwall mining close to the town of Hamm. Between 2006 July and 2007 July, more than 7000 events with magnitudes ML from −1.7 to 2.0 were detected. The spatiotemporal distribution of seismicity shows high correlation with the mining activity. In order to monitor rupture processes, we set up an automated source inversion routine and successfully perform double couple and full moment tensor (MT) inversions for more than 1000 events with magnitudes above ML −0.5. The source inversion is based on a full waveform approach, both in the frequency and in the time domain, providing information about the centroid location, focal mechanism, scalar moment and full MT. Inversion results indicate a strong dominance of normal faulting focal mechanisms, with a steeper plane and a subhorizontal one. Fault planes are oriented parallel to the mining stopes. We classify the focal mechanisms based on their orientation and observe different frequency-magnitude distributions for families of events with different focal mechanisms; the overall frequency-magnitude distribution is not fitting the Gutenberg–Richter relation. Full MTs indicate that non-negligible opening tensile components accompanied normal faulting source mechanisms. Finally, extended source models are investigated for largest events. Results suggest that the rupture processes mostly occurred along the subvertical planes.

Document Type: Article
Keywords: Geomechanics, Fracture and flow, Earthquake source observations, Seismicity and tectonics
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University
OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1093/gji/ggt300
ISSN: 0956-540X
Projects: Future Ocean
Date Deposited: 04 Oct 2017 15:04
Last Modified: 04 Oct 2017 15:04
URI: http://eprints.uni-kiel.de/id/eprint/39630

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