Stochastic finite-fault ground motion simulation for the Mw 6.7 earthquake in Lushan, China

Dang, Pengfei; Liu, Qifang

doi:10.1007/s11069-020-03859-3

Cited by 25 publications

(6 citation statements)

References 42 publications

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“…The model deviation obtained by the three path durations is nearly consistent with the recorded values; the maximum value of the model deviation in the whole period is no more than 0.41. This is consistent with the conclusion of Dang and Liu (2020), who simulated the 2013 Mw 6.7 Lushan, China earthquake and Dang et al (2021), who simulated the 2016 Mw 6.2 Tottori, Japan earthquake. Figure 14 shows In summary, in ground motion simulation, this study recommends using the source rise time determined in Equation 8 as the input parameter, which is consistent with the assumption used in deriving the static corner frequency, in theory, forming a unified whole, but also verified in the actual simulation.…”

Section: Effect Of Path Durationsupporting

confidence: 90%

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Dang,

Cui,

et al. 2023

Earth and Space Science

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On 21 May 2021 (local time), an Mw 6.1 earthquake struck the Yangbi County, Yunnan Province, China. The finite fault stochastic simulation approach is usually used to simulate ground motions in high‐frequency band (f > 1 Hz). Model parameters needed for earthquake ground motion simulation mainly include source, path, and site. In the high‐frequency ground motion simulation program widely used in earthquake engineering, the reciprocal of corner frequency is typically used to define the source rise time; however, the complete step‐wise derivation process is unavailable. In deriving the static corner frequency f0, source rise time is typically estimated to be the time required for the rupture to reach 50% of the final location, and the source rise time then can be obtained as 0.27/f0, which is consistent with the hypothesis of corner frequency and rupture velocity, and the correlation and integrity between parameters are established. This study also focuses on the influence of different source rise times and path durations on the simulation results, such as Fourier acceleration spectrum, pseudo‐spectral acceleration, and peak ground acceleration. The results show that the source rise time recommended in this simulation can improve the accuracy of near‐fault ground motion simulations. This study provides suggestions for a reasonable selection of path duration in different engineering applications.

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Section: Effect Of Path Durationsupporting

confidence: 90%

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Dang,

Cui,

et al. 2023

Earth and Space Science

Self Cite

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“…For example, if the dislocation of a subfault is extremely large, the subfault adjacent to it may be considerably small or even 0. Moreover, Dang and Liu (2020) used two different slip models to simulate the Lushan M w 6.7 earthquake; except for the different stress drop parameters, other input parameters were the same. The results indicated that the simulation method based on the two models provided the same results.…”

Section: Resultsmentioning

confidence: 99%

“…The results indicated that the simulation method based on the two models provided the same results. Some scholars have reported that random and inverted slip can only affect the simulation results at low frequencies and not at high frequencies (Dang & Liu, 2020; Fu & Li, 2017; Ghasemi et al., 2010). The results of the study comply with the observation values taken at most stations, especially at 65AKS, 65ALL, 65ALM, 65BRM, 65GDL, 65GLK, 65HLJ, 65HQC, 65JAS, 65SUF, 65SUL, 65YPH, and 65YPQ.…”

Section: Resultsmentioning

confidence: 99%

Ground Motion Simulations for the 19 January 2020 Jiashi, China, Earthquake Using Stochastic Finite‐Fault Approach

Wang

Dang

et al. 2022

Earth and Space Science

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A 6.0-magnitude (M w ) earthquake was reported to have occurred in Jiashi County, Xinjiang at 21:27 on 19 January 2020, Beijing time (13:27 UTC). This study applied a stochastic finite-fault approach based on the dynamic corner frequency (EXSIM) to simulate 23 near-field stations within a distance of 120 km from the epicenter. The stochastic finite-fault approach is the simplest and most effective method for simulating high-frequency ground motions. According to studies and empirical relationships, we estimated a region-specific parameter (κ 0 ) for use in simulations. In this study, two different slip models, namely, random and inverted slip models, were used to explain their influence on the simulation results. For most stations, the simulated seismic characteristics, such as the peak ground acceleration (PGA), pseudo spectral acceleration ,and Fourier acceleration spectrum, are highly compatible with the observed values in the frequency range (f > 1 Hz), indicating that the stochastic finite-fault approach is not highly sensitive to input slip distributions and fault dimensions. The simulation results indicated no significance between the two slip models under high-frequency conditions. Finally, based on the predicted PGA values of 1891 field points selected near the fault, the acceleration field of the Jiashi earthquake is plotted. The results show that the use of the acceleration time history predicted by modified EXSIM is feasible and practical in the high-frequency band above 1 Hz.

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“…At present, there are several site amplification correction methods to account for this effect: (1) the empirical transfer function (ETF) method (Huang et al, 2017), which is formed by the deviation between regional weak events simulation and observation; (2) the HVSR method, which was proposed by Nakamura (1989), indicates that the site overburden has a significant impact on the horizontal component of ground motion, but has little effect on the vertical ground motion. This method was applied successfully in the site correction of stochastic simulation of the 2013 Lushan and 2016 Meinong earthquakes (Chen et al, 2017; Dang and Liu, 2020). In this study, the HVSR method was used to estimate the shallow site response.…”

Section: Simulation Of the 2021 Yangbi Earthquake With A Magnitude Of...mentioning

confidence: 99%

Ground motion simulation for the 21 May 2021 Ms 6.4 Yangbi, China, earthquake using stochastic finite-fault method

et al. 2022

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On 21 May 2021, a 6.4-magnitude earthquake occurred in Yangbi County, Yunnan Province, China. To reproduce the ground motion characteristics of this earthquake, the stochastic finite-fault method was adopted. The ground motion records were analyzed to determine the source, path, and site parameters. Based on the optimization algorithm, the stress drop was set to 10 bar. The S-wave attenuation relation ( QS = 122.7 f0.44) was calculated by the spectral decay method. For the site effect, the site amplification was corrected using the horizontal-to-vertical spectral ratio method, and the zero-distance kappa filter had a value of 0.0328 s. To verify the reliability of the input parameters, the simulated 5%-damped pseudo-spectral acceleration, time history, and Chinese instrumental intensity were compared with those observed at six stations and finding acceptable consistency. Furthermore, the fitted model was used to simulate the ground motion of 2279 nodal points in the area, and the seismic intensity contours were obtained. Finally, the earthquake damage assessment was performed in the Yangbi County, and the difference between the designed spectral acceleration and that simulated at a specific period was regarded as the degree of earthquake damage. It was found that the reinforced concrete structures near the epicenter have sufficient safety reserves, and the earthquake damage was not serious. In summary, the stochastic finite-fault method with calibrated parameters could effectively synthesize the ground motion of specific sites, thus providing a basis for the earthquake damage assessment of engineering buildings.

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Stochastic finite-fault ground motion simulation for the Mw 6.7 earthquake in Lushan, China

Cited by 25 publications

References 42 publications

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Ground Motion Simulations for the 19 January 2020 Jiashi, China, Earthquake Using Stochastic Finite‐Fault Approach

Ground motion simulation for the 21 May 2021 Ms 6.4 Yangbi, China, earthquake using stochastic finite-fault method

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