摘要
2018年1月20日乌鲁木齐县发生MS4.8地震,乌鲁木齐市区多处震感强烈。此次地震新疆强震台网共获取36条地震动加速度记录,距离震中21.8km的草原工作站烈度速报台记录到本次地震最大峰值加速度97.1×10^-2m/s^2(NS向),距离震中最近的永丰镇峰值加速度70.8×10^-2m/s^2(NS向)。经计算永丰镇仪器烈度为5.5度,与现场工作队考察结果基本一致。对获取到的地震动加速度进行频谱分析,卓越频率集中在2~8Hz范围内,这可能是造成永丰镇建筑物出现轻微破坏的原因之一。将峰值加速度与经验性衰减关系进行对比,震中距小于33km时,水平峰值加速度普遍高于经验性衰减关系。
The strong motion of Urumqi county MS4.8 earthquake occured on January 20th,2018.It was strongly felt in a wide area of Urumqi.A total of 36 strong motion acceleration records were obtained by Xinjiang Digital Strong Motion Network.The maximum peak acceleration was 97.1gal(NS)recorded by Caoyuangongzuozhan intensity rapid report station which was 21.8km from the epicenter.Yongfengxiang intensity rapid report station was the closest to the epicenter with peak acceleration of 70.8gal(NS).The instrument intensity of Yongfengxiang station was 5.5,which was consistent with the result of field team basically.Spectrum analysis of the seismic acceleration showed that the predominant frequency was ranging from 2 to 8 Hz.Comparing the peak acceleration with empirical attenuation,when the epicenter distance was less than 33 km,the horizontal peak acceleration was generally higher than the empirical attenuation.
作者
李文倩
何金刚
LI Wen-qian;He Jin-gang(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)
出处
《内陆地震》
2019年第2期129-136,共8页
Inland Earthquake
