Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China

IF 3.8 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Bulletin of Earthquake Engineering Pub Date : 2024-06-17 DOI:10.1007/s10518-024-01934-9

Bin Zhang, Xiaojun Li, Yanxiang Yu, Xiaojian Lu, Mianshui Rong, Su Chen, Zhao An, Zhenghui Xiong

{"title":"Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China","authors":"Bin Zhang, Xiaojun Li, Yanxiang Yu, Xiaojian Lu, Mianshui Rong, Su Chen, Zhao An, Zhenghui Xiong","doi":"10.1007/s10518-024-01934-9","DOIUrl":null,"url":null,"abstract":"<div>This paper analyzed the strong motion characteristics based on 86 three-component strong motion records of the MW 6.6 Luding earthquake. Additionally, the factors that influence the variation in ground motion for three earthquakes with similar magnitude in Sichuan Province were investigated. The analysis result indicates a strong correlation between the observed ground motion parameters and the distribution of published Modified Mercalli Intensity. The residual analysis reveals that the spectral accelerations at periods 0.1–10.0 s are amplified to 0.0798–0.3057 times the mean level in the rupture forward direction and weakened to 0.0738–0.2831 times the mean level in the rupture backward direction. The maximum pulse direction recorded by the 51LDJ station is N6°E, aligning with the vertical fault direction. The velocity pulses has distinct bidirectional pulses in the waveforms, with a PGV of 37.0 cm/s. The source effect of the strike-slip MW 6.6 Luding and MW 6.5 Jiuzhaigou earthquakes on ground motion is relatively less significant compared to the average level of mainshocks in southwest China. However, the thrust-fault MW 6.7 Lushan earthquake exhibits a stronger source effect on ground motion during short and medium periods, but a weaker source effect during long periods when compared to the average level. The anelastic attenuation of the Longmenshan, Xianshuihe, and Huya fault zones in Sichuan exhibits significant regional variation and periodic correlation. This phenomenon is closely linked to the regional tectonic background variations and the heterogeneity of crustal structure within the area.</div>","PeriodicalId":9364,"journal":{"name":"Bulletin of Earthquake Engineering","volume":"22 9","pages":"4335 - 4355"},"PeriodicalIF":3.8000,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Earthquake Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10518-024-01934-9","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}

引用次数: 0

Abstract

This paper analyzed the strong motion characteristics based on 86 three-component strong motion records of the M_W 6.6 Luding earthquake. Additionally, the factors that influence the variation in ground motion for three earthquakes with similar magnitude in Sichuan Province were investigated. The analysis result indicates a strong correlation between the observed ground motion parameters and the distribution of published Modified Mercalli Intensity. The residual analysis reveals that the spectral accelerations at periods 0.1–10.0 s are amplified to 0.0798–0.3057 times the mean level in the rupture forward direction and weakened to 0.0738–0.2831 times the mean level in the rupture backward direction. The maximum pulse direction recorded by the 51LDJ station is N6°E, aligning with the vertical fault direction. The velocity pulses has distinct bidirectional pulses in the waveforms, with a PGV of 37.0 cm/s. The source effect of the strike-slip M_W 6.6 Luding and M_W 6.5 Jiuzhaigou earthquakes on ground motion is relatively less significant compared to the average level of mainshocks in southwest China. However, the thrust-fault M_W 6.7 Lushan earthquake exhibits a stronger source effect on ground motion during short and medium periods, but a weaker source effect during long periods when compared to the average level. The anelastic attenuation of the Longmenshan, Xianshuihe, and Huya fault zones in Sichuan exhibits significant regional variation and periodic correlation. This phenomenon is closely linked to the regional tectonic background variations and the heterogeneity of crustal structure within the area.

Abstract Image

查看原文本刊更多论文

2022 年四川泸定 6.6 级地震的强烈地动特征及西南三震区地动的区域变异性

本文根据泸定 6.6 级地震的 86 个三分量强震记录分析了强震特征。此外，还研究了影响四川省三次类似震级地震地面运动变化的因素。分析结果表明，观测到的地动参数与公布的修正麦加利烈度分布之间存在很强的相关性。残差分析表明，周期为 0.1-10.0 s 的频谱加速度在断裂前进方向被放大到平均水平的 0.0798-0.3057 倍，在断裂后退方向被减弱到平均水平的 0.0738-0.2831 倍。51LDJ 站记录到的最大脉冲方向为 N6°E，与垂直断层方向一致。速度脉冲的波形具有明显的双向性，PGV 为 37.0 厘米/秒。与中国西南地区主震的平均水平相比，走向滑动 MW6.6 泸定地震和 MW6.5 九寨沟地震对地面运动的震源效应相对较小。然而，与平均水平相比，MW6.7 芦山推断型地震在中短周期内对地面运动的震源效应较强，但在长周期内震源效应较弱。四川龙门山、咸水河、虎牙断层带的非弹性衰减表现出明显的区域差异和周期相关性。这一现象与区域构造背景变化和区内地壳结构的异质性密切相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Bulletin of Earthquake Engineering 工程技术-地球科学综合

CiteScore

8.90

自引率

19.60%

发文量

263

审稿时长

7.5 months

期刊介绍： Bulletin of Earthquake Engineering presents original, peer-reviewed papers on research related to the broad spectrum of earthquake engineering. The journal offers a forum for presentation and discussion of such matters as European damaging earthquakes, new developments in earthquake regulations, and national policies applied after major seismic events, including strengthening of existing buildings. Coverage includes seismic hazard studies and methods for mitigation of risk; earthquake source mechanism and strong motion characterization and their use for engineering applications; geological and geotechnical site conditions under earthquake excitations; cyclic behavior of soils; analysis and design of earth structures and foundations under seismic conditions; zonation and microzonation methodologies; earthquake scenarios and vulnerability assessments; earthquake codes and improvements, and much more. This is the Official Publication of the European Association for Earthquake Engineering.