Joint inversion of source location and focal mechanism of microseismicity

Liang, Chuntao; Yu, Yangyang; Yong, Yang; Kang, Liang; Yin, Chuancun; Wu, Furong

doi:10.1190/geo-2015-0272.1

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…Because of the polarity reversals existed in the waveforms, the moment tensors need to be determined to correct the polarities in order for the true event location (i.e., Zhebel and Eisner, 2015;Liang et al, 2016). The common approach is to estimate event location and moment tensors simultaneously by means of the global optimization methods, such as the grid search method.…”

Section: Discussionmentioning

confidence: 99%

“…In the diffraction stacking based methods, the problem of changing polarities (due to the radiation pattern of source mechanism) remains unavoidable. To overcome the destructive interference, the polarity is usually determined through estimating moment tensors before stacking Non-peer reviewed EarthArXiv preprint 6 (Anikiev et al, 2014;Zhebel and Eisner, 2015;Vlcek et al, 2016;Liang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Automatic microseismic stacking location with a multi-cross-correlation imaging condition

Yuan¹,

Zhang²,

Zhang³

2020

Preprint

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Automatic microseismic stacking location with a multi-cross-correlation imaging condition

Yuan¹,

Zhang²,

Zhang³

2020

Preprint

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“…They demonstrated a high quality of the source mechanisms even with a high level of noise in the data. Afterward, Liang et al () and Yu et al (2018) proposed a similar joint inversion strategy by extending the source‐scanning algorithm to the joint source‐scanning algorithm, which scans both locations and focal mechanism. They carried out a theoretical and numerical analysis of the feasibility of the new method and demonstrated its superior performance in robustness and efficiency with field data from surface microseismic monitoring in the Sichuan Basin.…”

Section: Challenges and Perspectivesmentioning

confidence: 99%

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Tan

Schwarz

et al. 2020

Reviews of Geophysics

132

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Source locations provide fundamental information on earthquakes and lay the foundation for seismic monitoring at all scales. Seismic source location as a classical inverse problem has experienced significant methodological progress during the past century. Unlike the conventional traveltime‐based location methods that mainly utilize kinematic information, a new category of waveform‐based methods, including partial waveform stacking, time reverse imaging, wavefront tomography, and full waveform inversion, adapted from migration or stacking techniques in exploration seismology has emerged. Waveform‐based methods have shown promising results in characterizing weak seismic events at multiple scales, especially for abundant microearthquakes induced by hydraulic fracturing in unconventional and geothermal reservoirs or foreshock and aftershock activity potentially preceding tectonic earthquakes. This review presents a comprehensive summary of the current status of waveform‐based location methods, through elaboration of the methodological principles, categorization, and connections, as well as illustration of the applications to natural and induced/triggered seismicity, ranging from laboratory acoustic emission to field hydraulic fracturing‐induced seismicity, regional tectonic, and volcanic earthquakes. Taking into account recent developments in instrumentation and the increasing availability of more powerful computational resources, we highlight recent accomplishments and prevailing challenges of different waveform‐based location methods and what they promise to offer in the near future.

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“…Microseismicity studies have been conducted in a wide range of fields for different purposes, such as the identification of fault plane (Kao & Shan, ; Mori & Hartzell, ); the detection of tectonic tremor, low frequency earthquakes and very low frequency earthquakes (Ito et al, ; Obara, ; Peng & Gomberg, ; Shelly, ; Shelly et al, ); the studies of seismicity before and after a large earthquake (Cesca et al, ; Kato et al, ; Nakamura et al, ; Tang et al, ; Yao et al, ); the monitoring of microseismic events induced by hydraulic fracturing in oil and gas industry (Eisner et al, ; Liang et al, ; Maxwell et al, ); and monitoring volcanic activity (Battaglia et al, ; Lengliné et al, ; Zhang & Wen, ). Two major aspects are essential in microseismicity study: identifying weak signals with a low signal‐to‐noise ratio (SNR) and constraining locations of small events.…”

Section: Introductionmentioning

confidence: 99%

“…A variety of characteristic functions are chosen for SSA with a coherent aim of highlighting effective signals by stacking, for instance, the short‐time‐average to long‐time‐average ratio (Allen, ); absolute amplitude (Kao & Shan, ); energy envelope (Baker et al, ; Kao & Shan, ); and the kurtosis and its gradient (Langet et al, ). Liang et al () proposed a modified SSA to scan seismic locations and focal mechanisms simultaneously, termed the joint SSA. The match filter method applies full‐wave cross‐correlation (CC) between template events and continuous waveforms to select slave events, which also elevates SNRs by stacking CC functions over multiple stations and components (Gibbons et al, ; Gibbons & Ringdal, ).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Distribution of Microearthquakes and Implications Around the Seismic Gap Between the Wenchuan and Lushan Earthquakes

et al. 2018

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The mechanism of why the rupture terminated sharply on both sides of the seismic gap between the Wenchuan and Lushan earthquakes is not yet known along the southwestern Longmen Shan fault zone. The accommodation modes of compressional strain and stress are still not known well in the gap subregion. Using the Match and Locate method, we obtained a detailed catalog of background microearthquakes around the seismic gap from May to December 2015. The characteristics of spatiotemporal distribution of the events is highlighted with a complete magnitude of 0.2. These small events tend to concentrate at different depth ranges on two sides of the seismic gap, indicating that the gap serves as a transition zone between the Wenchuan and Lushan source regions. Strain release through microearthquakes is an unlikely candidate for accommodating modes in the gap, because of the sustained deficit of microseismicity. A strong anticorrelation between background seismicity and monthly precipitation variation rate is observed for different magnitude scales. Enhanced seismicity may be activated by the terrestrial water storage reduction next to a precipitation peak with a time lag of 1-2 months during the summer and autumn, indicating a seasonal modulation of seismicity by the water storage cycle. The background microseismicity exhibits prominent responses to precipitation variation due to a short nucleation duration of less than one quarter. (1) The seismic activity is distinctively lower in the gap subarea compared to that on the two sides of it. (2) Another intriguing phenomenon is that the background seismicity may be modulated by the seasonal rainfall. The seismicity peaks correspond very well with sharp decrease of rainfall. The dramatic variation of water storage in mountain regions, which is controlled by rainfall, is a primary factor of background seismicity modulation in the study region. Plain Language Summary

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Joint inversion of source location and focal mechanism of microseismicity

Cited by 14 publications

References 27 publications

Automatic microseismic stacking location with a multi-cross-correlation imaging condition

Automatic microseismic stacking location with a multi-cross-correlation imaging condition

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Spatiotemporal Distribution of Microearthquakes and Implications Around the Seismic Gap Between the Wenchuan and Lushan Earthquakes

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