Estimating Seismic Intensity Maps of the 2021 Mw 7.3 Madoi, Qinghai and Mw 6.1 Yangbi, Yunnan, China Earthquakes

Chen, Wenkai; Wang, Dun; Zhang, Can; Yao, Qiang; Si, Hongjun

doi:10.1007/s12583-021-1586-9

Cited by 23 publications

(12 citation statements)

References 34 publications

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“…Many supershear ruptures were discovered by backprojecting seismic data recorded at dense stations. For the Madoi earthquake, modeling of the geodetic and teleseismic data gives a rupture speed of 2.6-2.8 km/s (K. Chen et al, 2022). This speed probably represents the average rupture speed for the entire process, and might overlook the variations of the speed over different segments.…”

Section: Comparison With Other Supershear Earthquakesmentioning

confidence: 99%

“…At 02:04 a.m. on May 22, 2021 (local time, hereafter the same), an Mw 7.3 earthquake occurred in Madoi County (34.59°N, 98.34°E, depth 17 km, according to the China Earthquake Networks Center, CENC), Qinghai Province, China (hereafter referred to as “The Madoi Earthquake”), with the epicenter located in the Bayan Har block of the Tibetan Plateau (Figure 1). The seismic intensity map showed a northwest‐southeast (NW‐SE)‐oriented damage zone centered at the earthquake epicenter, with a maximum seismic intensity of X degree (Ministry of Emergency, China, http://www.mem.gov.cn/xw/yjglbgzdt/202105/t20210528_386251.shtml; W. Chen et al., 2022). Due to the low population and the residential reinforcement project prior to the earthquake, there were no casualties but 17 people were injured.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are still debates concerning the rupture process of the Madoi earthquake. For example, modeling of geodetic data suggested a subshear rupture speed (K. Chen et al, 2022), whereas some seismic studies indicated a very fast rupture speed of 4 km/s (Yue et al, 2022;. The long fault rupture with multiple fault segments provides a great opportunity to map the mainshock rupture speed along the different fault segments and investigate the relation among rupture speed, fault structure, and aftershock distribution (Bouchon & Karabulut, 2008;Dunham et al, 2011;Xu & Ben-Zion, 2013).…”

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confidence: 99%

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The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike‐Slip Fault

et al. 2023

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At 02:04 a.m. on May 22, 2021 (local time, hereafter the same), an Mw 7.3 earthquake occurred in Madoi County (34.59°N, 98.34°E, depth 17 km, according to the China Earthquake Networks Center, CENC), Qinghai Province, China (hereafter referred to as "The Madoi Earthquake"), with the epicenter located in the Bayan Har block of the Tibetan Plateau (Figure 1). The seismic intensity map showed a northwest-southeast (NW-SE)-oriented damage zone centered at the earthquake epicenter, with a maximum seismic intensity of X degree (Ministry of Emergency, China,

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Section: Comparison With Other Supershear Earthquakesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike‐Slip Fault

et al. 2023

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“…The peak ground acceleration (PGA) reflects the ground motion intensity, an essential driver of lateral spreadings during an earthquake [75]. The PGA exceeds 0.5 g in almost all the epicentral areas and even reaches values above 0.7 in S 1 [76], where the Yematan Highway bridge was severely damaged. Additionally, the intense seismic shaking can induce collapses and notable fractures along the steep banks of the Yellow River and lakes.…”

Section: Discontinuous Surface Rupturesmentioning

confidence: 99%

Discontinuous Surface Ruptures and Slip Distributions in the Epicentral Region of the 2021 Mw7.4 Maduo Earthquake, China

Han,

Liu-Zeng,

Yao

et al. 2024

Remote Sensing

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Geometric complexities play an important role in the nucleation, propagation, and termination of strike-slip earthquake ruptures. The 2021 Mw7.4 Maduo earthquake rupture initiated at a large releasing stepover with a complex fault intersection. In the epicentral region, we conducted detailed mapping and classification of the surface ruptures and slip measurements associated with the earthquake, combining high-resolution uncrewed aerial vehicle (UAV) images and optical image correlation with field investigations. Our findings indicate that the coseismic ruptures present discontinuous patterns mixed with numerous lateral spreadings due to strong ground shaking. The discontinuous surface ruptures are uncharacteristic in slip to account for the large and clear displacements of offset landforms in the epicentral region. Within the releasing stepovers, the deformation zone revealed from the optical image correlation map indicates that a fault may cut diagonally across the pull-apart basin at depth. The left-lateral horizontal coseismic displacements from field measurements are typically ≤0.6 m, significantly lower than the 1–2.7 m measured from the optical image correlation map. Such a discrepancy indicates a significant proportion of off-fault deformation or the possibility that the rupture stopped at a shallow depth during its initiation phase instead of extending to the surface. The fault network and multi-fault junctions west and south of the epicenter suggest a possible complex path, which retarded the westward propagation at the initial phase of rupture growth. A hampered initiation might enhance the seismic ground motion and the complex ground deformation features at the surface, including widespread shaking-related fissures.

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“…These calculations are known as attenuation relationships, and they express ground motion as a function of distance and magnitude, as well as other variables like faulting type [2]. In the past, such relationships have been developed for numerous locations of the world [3,4,[13][14][15][16][17][18][5][6][7][8][9][10][11][12]. Most of these studies use regression analysis.…”

Section: Introductionmentioning

confidence: 99%

Application of metaheuristic algorithms in prediction of earthquake peak ground acceleration

Challagulla,

Suluguru,

Noroozinejad Farsangi

et al. 2023

The Journal of Engineering

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The seismic resilience of a structure has been evaluated using peak ground acceleration (PGA). Ground motion parameters such as source characteristics, local site conditions are used to forecast the PGA of the ground motion. This paper aims to develop an Artificial Neural Network (ANN) based model to predict the PGA. Here, hypocentral distance (Rhypo${R}_{hypo}$), shear wave velocity (Vs30${V}_{s30}$), and moment magnitude (Mw${M}_w$), are used as input parameters. The model uses 12,706 ground motion recordings from 283 earthquakes from the revised NGA‐West2 database supplied by Pacific Engineering Research Centre. Among the whole data, 70% of the data is set for training, 15% for validation, and 15% for testing the network. The R value derived from the testing dataset is 0.952, indicating the excellent performance of a network. An extensive parametric study is conducted with the PGA values, and the results indicate that the PGA increases with the magnitude and decreases with the hypocentral distance. The predicted PGA values from the present study are comparable with those from the existing relationships in the global database. The generated ANN model is further verified by comparing the predicted and recorded PGA values of an actual recorded event.

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Estimating Seismic Intensity Maps of the 2021 Mw 7.3 Madoi, Qinghai and Mw 6.1 Yangbi, Yunnan, China Earthquakes

Cited by 23 publications

References 34 publications

The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike‐Slip Fault

The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike‐Slip Fault

Discontinuous Surface Ruptures and Slip Distributions in the Epicentral Region of the 2021 Mw7.4 Maduo Earthquake, China

Application of metaheuristic algorithms in prediction of earthquake peak ground acceleration

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