Aftershock sequence relocation of the 2021 MS7.4 Maduo Earthquake, Qinghai, China

Wang, Weilai; Fang, Lihua; Wu, Jianping; Tu, Hongwei; Chen, Liyi; Lai, Guijuan; Zhang, Long

doi:10.1007/s11430-021-9803-3

Cited by 103 publications

(127 citation statements)

References 18 publications

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“…The uncertainty of the viscosity coefficient is greater than those of the elastic parameters. The viscosity coefficients of the Tibetan Plateau obtained in previous studies using different data and methods differ by several orders of magnitude (Beaumont et al, 2001;Clark & Royden, 2000;Royden, 1996;Shen et al, 2003;Wang, Fang, et al, 2021, Wang, Shen, et al, 2021Wen et al, 2012). Further research is warranted in the future regarding how to select appropriate medium parameters and how to consider a reasonable lithospheric structure in the calculations in order to obtain relatively reliable conclusions.…”

Section: Influence Of Lithospheric Structure On Calculation Resultsmentioning

confidence: 95%

“…The hypocenter of this earthquake was closer to the inner part of the block than the previous large earthquakes that occurred in this block. A high precision relocation study of its aftershocks (Wang, Fang, et al, 2021;Wang, Shen, et al, 2021) determined that the Kunlun Mountain Pass-Jiangcuo fault was the main seismogenic fault of the Maduo earthquake. According to the division of the active faults (Zhang et al, 2003), the fault is located near the boundary zone in the northern part of the Bayan Har Block, and overall, it is a NWW-trending sinistral strike-slip fault.…”

mentioning

confidence: 99%

“…Due to the strong discontinuous tectonic deformation, the active block boundary zone is conducive to stress accumulation for the generation of strong earthquakes (Zhang et al, 2003). When the front edge of the block is obstructed, a series of internal faults similar to the boundary faults is likely to form immediately adjacent to the block boundary fault zone, accompanied by strong seismic activity (Wang, Fang, et al, 2021;Wang, Shen, et al, 2021). Therefore, in addition to the block's boundary faults, the future seismic hazards posed by the nearby intra-block fault zones is also worthy of attention.…”

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confidence: 99%

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Stress Transfer at the Northeastern End of the Bayan Har Block and Its Implications for Seismic Hazards: Insights From Numerical Simulations

Huang¹,

Zhang

2021

Earth and Space Science

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also occurred in the Bayan Har Block (Figure 1). This series of large earthquakes provide us with excellent examples for exploring the stress transfer and fault interactions of the strong earthquakes in the continent.The adjustment of the regional stress field by earthquakes includes a coseismic stress drop and viscoelastic stress transfer. Extensive research has confirmed that the stress relaxation in the viscoelastic lower crust and upper mantle transfers stress to the seismogenic layer in the upper crust (

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Section: Influence Of Lithospheric Structure On Calculation Resultsmentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Stress Transfer at the Northeastern End of the Bayan Har Block and Its Implications for Seismic Hazards: Insights From Numerical Simulations

Huang¹,

Zhang

2021

Earth and Space Science

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“…Based on the relocated aftershocks (W. Wang et al, 2021) and the visually identified fault traces (Figures 1 and 2), we initially construct a fault model with five fault segments (Figure 2). The fault plane is discretized into a series of subfault patches with a dimension of 2 × 2 km.…”

Section: Coseismic Slip Distribution Inversionmentioning

confidence: 99%

Tectonic and Geometric Control on Fault Kinematics of the 2021 Mw7.3 Maduo (China) Earthquake Inferred From Interseismic, Coseismic, and Postseismic InSAR Observations

Zhao

Chen

Song

et al. 2021

Geophysical Research Letters

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Resulting from the ongoing India-Eurasia plate convergence and considerable tectonic loading, several large-scale strike-slip faults bounding the active blocks on the Tibetan plateau are considered to be a major seismogenic zone with the potential of generating devastating earthquakes (Kirby et al., 2007;Meade, 2007). One of the most remarkable kinematic features of the locked block-bounding fault zone on the Tibetan plateau is the localized or distributed high strain rate observed by interseismic geodetic velocities (e.g., H. Wang et al., 2019;Wang & Shen, 2020), indicating significant strain accumulation prior to a future earthquake (Loveless & Meade, 2011;Smith-Konter et al., 2011). However, faults with seemingly low or undetectable interseismic strain rates still have the potential to generate large earthquakes, and a wide range of hypotheses accounting for such unusual features include long earthquake intervals accompanied by low fault slip rates and/or large locking depth, distributed off-fault deformation around the active faults and earthquake cycle effects (e.g.,

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“…Field investigations immediately after the event [1,2], and Interferometric Synthetic Aperture Radar (InSAR) observation obtained within a few days after the main shock [3][4][5] confirmed that the seismogenic fault of the Maduo earthquake was the Kunlunshankou-Jiangcuo Fault, a secondary fault ~70-80 km to the south of the East Kunlun Fault within the Bayan Har block. This unexpected earthquake was the largest earthquake to have occurred in China since the 2008 Mw 7.9 Wenchuan earthquake [6][7][8], challenging the conventional perspective that the Bayan Har block acts as a quasi-stable block.…”

Section: Introductionmentioning

confidence: 99%

Earthquake Magnitude Estimation from High-Rate GNSS Data: A Case Study of the 2021 Mw 7.3 Maduo Earthquake

Gao

Shan

et al. 2021

Remote Sensing

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Peak ground displacement (PGD) and peak ground velocity (PGV) are critical parameters during earthquake early warning, as they can provide rapid magnitude estimation before rupture end. In this study, we used the high-rate Global Navigation Satellite System (GNSS) data from 55 continuous stations to estimate the magnitude of the 2021 Maduo earthquake in western China. We used the relative positioning method and variometric approach to acquire real-time GNSS displacement and velocity waveforms, respectively. The results showed the amplitude of displacement and velocity waveforms gradually decreased with increasing hypocentral distance. Our results showed that the fluctuation of PGD magnitudes over time is smaller than that of PGV magnitudes. Nonetheless, the earthquake magnitudes estimated from both methods were consistent with their counterparts (Mw 7.3) reported by the United States Geological Survey (USGS). The final magnitude estimated from the PGD and PGV methods were Mw 7.25 and Mw 7.31, respectively. In addition, our results highlighted how the number of high-rate GNSS stations could influence the stability and convergence time of magnitude estimation.

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Aftershock sequence relocation of the 2021 MS7.4 Maduo Earthquake, Qinghai, China

Cited by 103 publications

References 18 publications

Stress Transfer at the Northeastern End of the Bayan Har Block and Its Implications for Seismic Hazards: Insights From Numerical Simulations

Stress Transfer at the Northeastern End of the Bayan Har Block and Its Implications for Seismic Hazards: Insights From Numerical Simulations

Tectonic and Geometric Control on Fault Kinematics of the 2021 Mw7.3 Maduo (China) Earthquake Inferred From Interseismic, Coseismic, and Postseismic InSAR Observations

Earthquake Magnitude Estimation from High-Rate GNSS Data: A Case Study of the 2021 Mw 7.3 Maduo Earthquake

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