Analysis of ground motion characteristics and near-fault effects for the September 5, 2022, MS6.8 Luding earthquake

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Dexin Lin, Qiang Ma, Quancai Xie, Junjie Zhang, Dongwang Tao
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Abstract

Using the three component acceleration records of the National Strong Motion Observation Network System (NSMONS) and the National Seismic Intensity Rapid Reporting and Earthquake Early Warning Network, the ground motion attenuation characteristics, spatial distribution, source rupture direction, and near-fault pulse characteristics of the Luding MS6.8 earthquake were analyzed. Comparing the observed values of peak ground acceleration (PGA), peak ground velocity (PGV), pseudo-spectral acceleration (PSA), and 90% significant duration (SD) with several typical ground motion prediction equations (GMPE), it was found that the ground motion attenuation characteristics of this earthquake are consistent with GMPE for the southwest region, but overall lower than the global model average level. In the comparison of between-event residuals, this earthquake exhibits different characteristics from the same magnitude thrust type earthquake. The within-event residuals reflect that the anelastic attenuation in the Luding region is slightly weaker than that in the Menyuan region. In terms of spatial distribution of ground motion parameters, the PGV and PSA with a period of 1.0 to 8.0 s have significantly higher intensity in the southeast direction of the epicenter than in other directions. Based on PGV, it is speculated that the source rupture direction of the earthquake was 151°, which is close to the fault strike of 163°. Pulse-like ground motions were identified in up to 12 sets of near-fault records with pulse periods significantly lower than historical earthquakes of similar magnitudes. Stations with pulse peak values greater than 40 cm·s−1 in the pulse dominant direction of the velocity time history all appeared in the narrow band area ahead of the rupture direction. The distribution area of near-fault pulses is highly correlated with the distribution of high macroseismic intensity areas and landslide areas, and it is necessary to pay attention to the impact of near-fault pulses in seismic fortification.

Abstract Image

2022 年 9 月 5 日泸定 MS6.8 级地震的地面运动特征和近断层效应分析
利用国家强震观测网系统(NSMONS)和国家地震烈度速报与地震预警网的三分量加速度记录,分析了泸定MS6.8地震的地动衰减特征、空间分布、震源破裂方向和近断层脉冲特征。将地面峰值加速度(PGA)、地面峰值速度(PGV)、伪谱加速度(PSA)和 90%显著持续时间(SD)的观测值与几种典型的地面运动预测方程(GMPE)进行比较,发现此次地震的地面运动衰减特征与西南地区的 GMPE 一致,但总体上低于全球模型的平均水平。在事件间残差比较中,本次地震表现出与同级推力型地震不同的特征。事件内残差反映出泸定地区的非弹性衰减略弱于门源地区。从地震动参数的空间分布来看,周期为 1.0~8.0 秒的 PGV 和 PSA 在震中东南方向的强度明显高于其他方向。根据 PGV 推测,震源断裂方向为 151°,与断层走向 163°接近。在多达 12 组近断层记录中发现了脉冲地动,其脉冲周期明显低于历史上类似震级的地震。在速度时间历程的脉冲主导方向上,脉冲峰值大于 40 cm-s-1 的台站均出现在断裂方向前方的窄带区域。近断层脉冲分布区与宏观地震高烈度区和滑坡区的分布高度相关,在抗震设防中需要重视近断层脉冲的影响。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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