On the full-waveform inversion of seismic moment tensors

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:202

Article

Amad, Alan A. S.¹  Novotny, Antonio A.²  Guzina, Bojan B.³ 

[1] Swansea Univ, Zienkiewicz Ctr Computat Engn, Coll Engn, Bay Campus, Swansea, W Glam, Wales

[2] Coordenacao Metodos Matemat & Computacionais, Lab Nacl Comp Cient LNCC MCT, Av Getulio Vargas 333, BR-25651075 Petropolis, RJ, Brazil

[3] Univ Minnesota, Dept Civil Environm & Geoengn, Minneapolis, MN 55455 USA

关键词: Inverse source problem;    Acoustic emission;    Waveform inversion;    Seismic moment tensor;    Multiple sources;   

DOI  :  10.1016/j.ijsolstr.2020.06.012

来源: Elsevier

【 摘 要 】

In this work, we propose a full-waveform technique for the spatial reconstruction and characterization of (micro-) seismic events via joint source location and moment tensor inversion. The approach is formulated in the frequency domain, and it allows for the simultaneous inversion of multiple point-like events. In the core of the proposed methodology is a grid search for the source locations that encapsulates the optimality condition on the respective moment tensors. The developments cater for compactly supported elastic bodies in R-2; however our framework is directly extendable to inverse (seismic) source problems in R-3 involving both bounded and unbounded elastic domains. A set of numerical results, targeting laboratory applications, is included to illustrate the performance of the inverse solution in situations involving: (i) reconstruction of multiple events, (ii) sparse (pointwise) boundary measurements, (iii) off-grid location of the micro-seismic events, and (iv) inexact knowledge of the medium's elastic properties. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free