Slip rate of the seismogenic fault of the 2021 Maduo earthquake in western China inferred from GPS observations

Zhu, Yage; Diao, Faqi; Fu, Yuchao; Liu, Chengli; Xiong, Xiong

doi:10.1007/s11430-021-9808-0

Cited by 47 publications

(23 citation statements)

References 26 publications

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“…Using dense near‐field GPS observation profiles across the Kunlun fault, Y. Zhu et al. (2021) inverted the slip rate of 1.2 ± 0.8 mm/yr on the seismogenic fault. The similar slip rate also had been inverted using the interseismic deformations derived from the S1A/B InSAR data during 2014–2019 (L. Zhu et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

“…This earthquake provides a unique chance to understand the seismogenic mechanism and regional seismic hazard risks. After this earthquake, the relocated aftershock sequences (Wang et al., 2021), slip rate across the seismogenic fault (Y. Zhu et al., 2021), the 3D coseismic deformation (J. Liu et al., 2021), and coseismic source modeling (e.g., Hua et al., 2021; Li et al., 2021; Zhao et al., 2021) are quickly presented, but the complete coseismic deformation from geodetic data and the fault postseismic slip model are seldom reported.…”

Section: Introductionmentioning

confidence: 99%

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Coseismic and Early Postseismic Slip Models of the 2021 Mw 7.4 Maduo Earthquake (Western China) Estimated by Space‐Based Geodetic Data

Feng

et al. 2021

Geophysical Research Letters

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The 1600-km-long left-lateral East Kunlun fault (EKF) defines the northern boundary of the Bayan-Har Block, which is one of the most seismically active regions in the Tibetan Plateau, China (Li et al., 2011;. Over the past century, three destructive earthquakes (M > 7) ruptured some segments of the EKF, including the 1937 M7.5 Huashixia, 1963 M7.0 Dulan, and 2001 𝐴𝐴 Mw 7.8 Kokoxili earthquakes (Figure 1a), leaving two seismic gaps. One is the Maqin-Maqu seismic gap (Wen et al., 2007), where large earthquakes are expected to occur in the near future. Yet no related sign has been observed. In addition, the EKF is somewhat straight to the west of 98°E but bends ∼45° toward the southeast from 98°E to 99.5°E. Across such a fault geometry bending, the slip rate of the EKF decreases from ∼10 mm/yr in the west section of 98°E to ∼5-6 mm/yr along the Maqin-Maqu segment (Kirby et al., 2007;Van Der Woerd et al., 1998, 2002. Such a slip rate decrement suggests that the deformation is accommodated by some nearby structures and faults. Hence, some faults around the Maqin-Maqu segment, even though the slip rate is low, can be the location of large earthquakes. On May 22, 2021, an 𝐴𝐴 Mw 7.4 earthquake struck the Maduo county of Guoluo prefecture in Qinghai province, western China. This earthquake is another large earthquake (M > 7) that occurred in the Bayan-Har block since the 1947 M7.7 Dari earthquake. Until 30 May 2021, a total of 2979 aftershocks have been recorded by the China earthquake administration (Wang et al., 2021). This event caused severe damages to local buildings and

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coseismic and Early Postseismic Slip Models of the 2021 Mw 7.4 Maduo Earthquake (Western China) Estimated by Space‐Based Geodetic Data

Feng

et al. 2021

Geophysical Research Letters

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“…According to the China Earthquake Information Network ( http://www.csi.ac.cn/ ), Maduo earthquake has the focal depth of 17 km, and the average altitude of 4,200 m within 10 km of the epicenter. Up to date, many scholars have kept on studying on the occurrence mechanism and induced geohazards of the 2021 Maduo earthquake (Chen et al, 2021 ; Gao et al, 2021 ; Wang et al, 2021 ; Zhu et al, 2021 ). However, we still know less about how will plant community responds to the earthquake in alpine grassland.…”

Section: Methodsmentioning

confidence: 99%

Effects of Strong Earthquake on Plant Species Composition, Diversity, and Productivity of Alpine Grassland on Qinghai-Tibetan Plateau

et al. 2022

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Earthquakes occur frequently in fragile alpine grassland areas on the Qinghai-Tibet Plateau (QTP), but few studies have evaluated the impacts of seismo-fault of earthquake on alpine grassland vegetation diversity. In this study, we conducted a field survey of plant communities of alpine grassland along the fault zone in the 7.4 Maduo earthquake occurred on 22 May 2021. Surrounding grassland habitat far from the seismo-fault of earthquake was selected as the control. Plant community metrics around and far from seismic rupture were studied. The results showed that plant community metrics were negatively affected by seismo-fault of earthquake. Species composition around seismo-fault was being shifted from sedges-dominant into forbs-dominant. In addition, the diversity and aboveground biomass were significantly decreased around seismo-fault compared with the control. Our findings highlighted that earthquakes can cause species loss and plant community shift and finally lead to productivity reduction of alpine grassland. Additionally, forbs may be more competitive than other functional groups after the earthquake.

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“…In addition, both the geodetic observations over decadal timescales and geological studies from millennialscale geomorphic markers document a decreased slip rate on the east Kunlun fault from west to east (Diao et al, 2009;Duvall & Clark, 2010;Kirby et al, 2007;Lin & Guo, 2008;Zhu et al, 2021a;Zhu et al, 2020;Zhu et al, 2021b), and it terminated within the thickened crust of the plateau at its easternmost tip.…”

Section: Block-wide Distributed Deformation In the East Bayan Har Blockmentioning

confidence: 99%

Resolving co- and early post-seismic slip variations of the 2021 MW 7.4 Maduo earthquake in east Bayan Har block with a block-wide distributed deformation mode from satellite synthetic aperture radar data

Wang

Song

et al. 2022

Earth and Planetary Physics

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On 21 May 2021 (UTC), an MW 7.4 earthquake jolted the east Bayan Har block in the Tibetan Plateau. The earthquake received widespread attention as it is the largest event in the Tibetan Plateau and its surroundings since the 2008 Wenchuan earthquake and in proximity to the seismic gaps on the east Kunlun fault. Here we use satellite interferometric synthetic aperture radar data and subpixel offset observations along the range directions to characterize the coseismic deformation of the earthquake. Rang offset displacements depict clear surface ruptures with a total length of ~170 km involving two possible activated fault segments in the earthquake. Coseismic modeling results indicate that the earthquake is dominated by left-lateral strike-slip motions of up to 7 m within top 12 km of the crust. The well-resolved slip variations are characterized by five major slip patches along strike and 64% of shallow slip deficit, suggesting a young seismogenic structure. Spatial-temporal changes of postseismic deformation are mapped from the early 6day and 24-day InSAR observations, and are well explained by time-dependent afterslip models. Analysis of GPS velocity profiles and strain rates suggests that the eastward extrusion of plateau is diffusely distributed across the east Bayan Har block, but showing significant lateral heterogeneities as evidenced by magnetotelluric observations. The block-wide distributed deformation of the east Bayan Har block along with the significant co-and post-seismic stress loading from the Maduo earthquake imply high seismic risks on regional faults, especially the Tuosuo Lake and Maqin-Maqu segments of the Kunlun fault that known as seismic gaps.

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Slip rate of the seismogenic fault of the 2021 Maduo earthquake in western China inferred from GPS observations

Cited by 47 publications

References 26 publications

Coseismic and Early Postseismic Slip Models of the 2021 Mw 7.4 Maduo Earthquake (Western China) Estimated by Space‐Based Geodetic Data

Coseismic and Early Postseismic Slip Models of the 2021 Mw 7.4 Maduo Earthquake (Western China) Estimated by Space‐Based Geodetic Data

Effects of Strong Earthquake on Plant Species Composition, Diversity, and Productivity of Alpine Grassland on Qinghai-Tibetan Plateau

Resolving co- and early post-seismic slip variations of the 2021 MW 7.4 Maduo earthquake in east Bayan Har block with a block-wide distributed deformation mode from satellite synthetic aperture radar data

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