Automated moment tensor inversion to estimate source mechanisms of hydraulically induced micro-seismicity in salt rock

被引:79
作者
Dahm, T
Manthei, G
Eisenblätter, J
机构
[1] Univ Frankfurt, Inst Meteorol & Geophys, D-60323 Frankfurt, Germany
[2] GMuG, D-6123 Ober Morlen, Germany
关键词
hydraulic fracturing; micro-earthquakes; acoustic emissions; seismic moment tensor;
D O I
10.1016/S0040-1951(99)00041-4
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Two methods for an automated moment tensor inversion are investigated. The first is a single-source inversion using amplitude spectra of observed body-wave phases and theoretical Green functions, and the second a relative moment tensor inversion using spectral moments of body-wave phases. An optional general-dislocation-source constraint is introduced to stabilize the inversions for sparse data. Both methods are successfully tested on synthetic data and are applied to hydraulically induced micro-seismicity in salt rock. The estimated moment tensors of 187 events show similar radiation patterns with a major double-couple component and a small or zero isotropic component. We explain the double-couple component with failure on horizontal, preexisting planes of weakness within the process zone of circular tension-fractures (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1 / 17
页数:17
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