[1]JIANG Peng,LI Pingping,LI Tonglin,et al.The Characteristics of Strong Motion Records of the 2022 Luding,Sichuan MS6.8 Earthquake[J].Journal of Seismological Research,2023,46(04):593-602.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0057
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The Characteristics of Strong Motion Records of the 2022 Luding,Sichuan MS6.8 Earthquake
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
46
Number of periods:
2023 04
Page number:
593-602
Column:
Public date:
2023-07-15
- Title:
- The Characteristics of Strong Motion Records of the 2022 Luding,Sichuan MS6.8 Earthquake
- Keywords:
- the Luding MS6.8 earthquake; strong motion records; response spectrum; attenuation relation
- CLC:
- P315.914
- DOI:
- 10.20015/j.cnki.ISSN1000-0666.2023.0057
- Abstract:
- At 12:52 on September 5,2022,an MS6.8 earthquake occurred in Luding County,Sichuan Province,China.The Sichuan Earthquake Early Warning Network acquired 1 799 sets of seismic records.The acquisition of high-density strong motion records has great significance for the study of regional ground motion characteristics and source characteristics.In this paper,we calculate the ground motion related parameters of the strong motion records.Using the Kreging interpolation method,we obtain the spatial distribution maps of PGA,PGV,and acceleration response spectrum based on those related parameters.This shows that the peak values of ground motion recorded by the reference stations,the basic stations and the general stations increase successively,reflecting the amplification effect of terrain and site conditions.In the high intensity area,the intensity determined through strong ground motion instruments is consistent with the intensity determined through field investigation.While in the Ⅵ-degree area,there is a striking difference between the instrumental-intensity contour and the survey-intensity contour,which reflects that the instrumental intensity is not consistent with survey intensity in the area where the earthquake damage is light.The seismic phase analysis shows that the peak value in the vertical direction recorded by the stations near the fault is larger,and large horizontal velocity pulses are recorded at several stations.Based on the peak values of ground motion of bedrock,we analyze the attenuation characteristics of the Luding MS6.8 earthquake.Compared with PGV proposed in the Seismic Ground Motion Parameters Zonation Map of China(GB18306—2015),PGV in this Luding earthquake event decays with distance more slowly.The characteristics of seismic phases show this earthquake is more consistent with the characteristics of shallow earthquakes.To further analyze the relationship between the ground motion and the earthquake damage,we select the strong motion records in two areas with severe earthquake damage,and calculate the pseudo-acceleration response spectrum of 5% damping ratio.In the period Tg-1.5 s,the acceleration response spectrum value exceeds the design response spectrum value.In some periods,the acceleration response spectrum value exceeds the response spectrum value of rare earthquakes.Response spectrum has a good correlation with earthquake damage.
- References:
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Last Update:
2023-10-01