2023年8月6日山东平原5.5级地震震源参数初步分析

Preliminary Analysis of Source Parameters of the M5.5 Earthquake on August 6,2023 in Pingyuan Country,Shandong Province

摘要:

北京时间2023年8月6日2时33分山东德州市平原县(37.16°N,116.34°E)发生5.5级地震,中国地震台网中心部署的预警试运行系统于震后7.5s产出首报预警结果。中国地震台网中心于震后2min发布自动速报结果,于震后10min发布正式速报结果,同时联合多家单位启动地震应急产品产出工作,共产出震源参数、历史地震、地震构造、震源机制、余震精定位、推测烈度和震源破裂过程等9类应急产品。结果显示,本次地震发生在林南断裂附近,震源机制解表明该地震为一次走滑型事件; 余震精定位结果显示余震展布呈近NEE向,与震中附近断裂方向一致; 烈度速报推测极震区烈度达Ⅷ度,区域面积约528km²,Ⅶ度及以上区域总面积约1694km²。

Abstract:

An earthquake of magnitude 5.5 occurred in Pingyuan county(37.16N,116.34E),Shandong Province at 2:33 on August 6,2023,of Beijing time. The early warning produced the first early warning results 7.5 seconds after the earthquake. The China Earthquake Network Center released the automatic rapid report results in 2 minutes after the earthquake and the official rapid report results in 10 minutes after the earthquake. Cooperated with multiple units,the China Earthquake Network Center produced 9 types of emergency products,including source basic parameters,historical earthquakes,seismic tectonics,source mechanisms,aftershock location,earthquake intensity and source rupture process. The results show that the earthquake occurred near the Linnan fault. The source mechanism indicates that the earthquake was a strike-slip event. The results of aftershock precise relocation show that the aftershock spread was close to NEE direction,which was consistent with the fault direction near the epicenter. The estimation from the Intensity Rapid Report suggests that the intensity of the polar earthquake area reaches Ⅷ,with an area of about 528km²,and the total area of Ⅶ and above is about 1694km².