relation: https://episodesplatform.eu/eprints/2103/
title: Simultaneous microearthquake location and moment‐tensor estimation using time‐reversal imaging
creator: Gharti, Hom Nath
creator: Oye, Volker
creator: Kuhn, Daniela
creator: Zhao, Peng
subject: Source parameter estimation
subject: Pyhäjärvi
subject: Underground mining
description: We use time‐reversal imaging for microearthquake location and investigate the possibility of a  simultaneous qualitative moment‐tensor estimation. We cross‐correlate the data with the synthetic  strain Green's tensor and stack individually for each moment‐tensor component. The objective  function for the source location is then formulated as the squared sum of those stacked components.  The maximum value of the objective function corresponds to the estimated source location and  origin time. Similarly, the corresponding stacked components at the estimated source location give  the entire time history of the qualitative estimation of the moment tensor. We apply the method to  synthetic data of various types of moment‐tensor sources computed for a complex and  heterogeneous model, namely the Pyhäsalmi ore mine in Finland. We also test the method with the  same data adding white noise up to 40% of the absolute maximum. Although the method is  computationally intensive, it is fully automatic and can easily be adapted to parallel processing. The  preliminary results show that the method is robust and reliable.
publisher: Society of Exploration Geophysicists
date: 2011
type: Article
type: NonPeerReviewed
identifier:   Gharti, Hom Nath and Oye, Volker and Kuhn, Daniela and Zhao, Peng  (2011) Simultaneous microearthquake location and moment‐tensor estimation using time‐reversal imaging.  SEG Technical Program Expanded Abstracts 2011, 2011.  pp. 1632-1637. DOI: https://doi.org/10.1190/1.3627516 <https://doi.org/10.1190/1.3627516>     
relation: http://doi.org/10.1190/1.3627516
relation: doi:10.1190/1.3627516