[1]LI Cuiqin,ZHENG Jianchang,ZHANG Zhengshuai,et al.Analysis of Seismic Source Parameters of the Pingyuan, Shandong MS5.5 Earthquake on August 6,2023[J].Journal of Seismological Research,2025,(02):334-340.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0035
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Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
Number of periods:
2025 02
Page number:
334-340
Column:
Public date:
2025-02-10
- Title:
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Analysis of Seismic Source Parameters of the Pingyuan, Shandong MS5.5 Earthquake on August 6,2023
- Author(s):
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LI Cuiqin; ZHENG Jianchang; ZHANG Zhengshuai; DAI Zonghui
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(Shandong Earthquake Agency,Jinan 250014,Shandong,China)
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- Keywords:
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the Pingyuan MS5.5 earthquake; apparent stress; source parameters; corner frequency; western Shandong
- CLC:
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P315.33
- DOI:
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10.20015/j.cnki.ISSN1000-0666.2025.0035
- Abstract:
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On August 6,2023,a 5.5-magnitude earthquake occurred in Pingyuan County of Dezhou City,Shandong Province.On the basis of the Brune model,we take the minimum absolute residual between the theoretical source spectrum and the observed source spectrum as the objective function,and estimate the model parameters by using the high-cut method.Then we obtain the characteristic parameters of the source spectrum of the mainshock and some aftershocks(ML≥2.0).We further analyze the scaling relationship between different source parameters and the spatio-temporal characteristics of apparent stress.The conclusions are as follows:①The apparent stress of the mainshock is about 1.7 MPa.The stress drop is about 3.5 MPa.Moment magnitude(MW)is 5.2.Corner frequency(fc)is about 0.58 Hz; ② For the Pingyuan earthquake sequence,its magnitudes have good linear relations with the corresponding apparent stress:lgδapp=0.64ML+2.92; ③The aftershocks' apparent stress gradually decreases with time.The apparent stress of the 38 aftershocks is under 0.15 MPa,lower than the average apparent stress(0.16 MPa)of the small earthquakes in western Shandong.