地震地磁观测与研究2023，Vol.44Issue(6)：13-19,7.DOI:10.3969/j.issn.1003-3246.2023.06.002
2023年山东平原MS5.5地震宽频带面波震级和近场地震动反应谱空间分布特征分析
Spatial distribution characteristics of broadband surface-wave magnitude and response spectra for ground motion in the near-field for the August 6,2023 MS 5.5 Pingyuan earthquake,Shandong Province
摘要
Abstract
On August 6,2023,a MS 5.5 earthquake occurred in Pingyuan County,Shandong Province.The China Earthquake Networks Center obtained abundant three-component waveform data from seismic and strong ground motion stations.In this paper,we used broadband vertical component velocity records from 80 stations within a 2°-10° epicentral distance to measure the surface-wave magnitude of this event.Using three component recordings of 1278 strong ground motion instruments and simple intensity meters within 200 km,we calculate the acceleration response spectra.The results show that the surface-wave magnitude MS(BB)averaged 5.5,and those stations with relatively small magnitudes are mostly distributed on the southwest side of the epicenter,while those with larger magnitudes are in the northeast.The acceleration response spectra within 200 km in the near-field show an NE-SW trend with a strip-shaped distribution characteristic,and along the fault rupture direction,the attenuation is slow while fast along the vertical fault direction.The spatial distribution of broadband surface-wave magnitude and acceleration response spectra support the unilateral rupture,mainly in the NE direction.According to the seismic fault data in the epicenter area,the earthquake may belong to the Gaotang and Lingxian-Yangxin hidden fault system.关键词
平原地震/多普勒效应/宽频带面波震级/近场地震动特征Key words
Pingyuan earthquake/Doppler effect/broadband surface-wave magnitude/near-field ground motion characteristics引用本文复制引用
韩光洁,刘奕君,席楠..2023年山东平原MS5.5地震宽频带面波震级和近场地震动反应谱空间分布特征分析[J].地震地磁观测与研究,2023,44(6):13-19,7.基金项目
地震科技星火计划(项目编号:XH23050YB) （项目编号:XH23050YB）
国家自然科学基金(项目编号:42304072) （项目编号:42304072）
