Focal Mechanisms of Mw 6.3 Aftershocks from Waveform Inversions, Phayao Fault Zone, Northern Thailand

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS International Journal of Geophysics Pub Date : 2017-05-24 DOI:10.1155/2017/9059825
Kasemsak Saetang
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引用次数: 4

Abstract

The focal mechanisms of Mw 6.3 aftershocks, Chiang Rai Province, Northern Thailand, were determined by using a multistation waveform inversion. Three aftershocks were selected and their waveforms were inverted for moment tensor calculation. Waveform inversions were derived from three broadband stations with three components and epicentral distances less than 250 km after all seismic stations were considered. The deviatoric moment tensor inversion was used for focal mechanism calculations. Band-pass filtering in the range of 0.03–0.15 Hz was selected for reducing low- and high-frequency noise. Source positions were created by using a single-source inversion and a grid-search method computed to optimize the waveform match. The results showed stable moment tensors and fault geometries with the southwest azimuth in the northern part of the Payao Fault Zone (PFZ) with depths shallower than 10 km. Left-lateral strike-slip with a reverse component was detected. The tectonics of the PFZ is constrained by fault-plane solutions of earthquakes. WSW directional strikes are observed in the northern part of the PFZ.
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泰国北部帕瑶断裂带波形反演的6.3级余震震源机制
利用多站波形反演确定了泰国北部清莱省6.3级余震的震源机制。选取3次余震进行波形反演,进行矩张量计算。在考虑了所有地震台站之后,波形反演得到了三个三分量、震中距离小于250公里的宽带台站。采用偏矩张量反演进行了震源机制计算。采用0.03 ~ 0.15 Hz的带通滤波来降低低频和高频噪声。采用单源反演和网格搜索的方法对波形匹配进行优化。结果表明,在帕窑断裂带北部,深度小于10 km的断层具有稳定的矩张量和西南方位的断层几何形状。检测到具有反向分量的左侧走滑。PFZ的构造受地震断面解的约束。在PFZ北部观察到WSW定向打击。
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来源期刊
International Journal of Geophysics
International Journal of Geophysics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
0.00%
发文量
12
审稿时长
21 weeks
期刊介绍: International Journal of Geophysics is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of theoretical, observational, applied, and computational geophysics.
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