2014年景谷MS6.6地震及其强余震强震动观测记录及初步分析*

(云南省地震局,云南 昆明 650224)

强震动观测记录; 强余震; 景谷地震; 鲁甸地震

Strong-motion Observation Recordings of Jinggu MS6.6 Earthquake and its Strong Aftershocks in Yunnan in 2014 and their Preliminary Analysis
CUI Jianwen,LIU Qiongxian,DUAN Jianxin,LIN Guoliang,YANG Liwei,XU Shuo,

(Earthquake Administration of Yunnan Province, Kunming 650224, Yunnan, China)

strong motion observation recordings; strong aftershocks; Jinggu MS6.6 earthquake; Ludian MS6.5 earthquake

备注

2014年10月7日云南景谷发生MS6.6地震,中国数字强震动台网(NSMONS)的40个台站(阵)获取了主震的强震动记录。位于极震区永平镇的强震动台站完整记录了地震动时程,其北南向PGA为627.1 cm/s2,该台站周边多栋教学楼破坏严重,与记录所反映的强烈震动程度相吻合。12月6日主震区再次发生MS5.8、5.9强余震,NSMONS的多个台站(阵)及布设于震区的强震动流动台站获取了两次地震强震动记录。首先介绍获取强震动观测记录,接着对其强震动特征进行初步分析,最后对比分析景谷地震与鲁甸地震强震动的差异及影响。

A MS6.6 earthquake occurred in Jinggu County of Yunnan Province on Oct.7,2014, and its strong motion recording of main shock have been recorded by 40 strong motion observation stations that are parts of the National Strong Motion Observation Network System(NSMONS). The strong ground motion time history of the mainshock was perfectly recorded by the strong motion station which is located at Yongping town in the meizoseismal area,and the PGA of it is 627.1 cm·s-2 in North-South Component. Many school buildings were severely damaged around the station, which were coincide with the strong shock reflected in the recording. The two strong aftershocks of MS5.8 and MS5.9 occurred in the main shock area on Dec.6,2014 and their strong motion recordings were recorded by lots of stations of NSMONS and the mobile stations deployed after the main shock. Firstly, we describe the strong motion recordings of the main shock and two big aftershocks and then take the preliminary analysis on the strong motion recordings. Finally,the characteristics difference of the strong motion between Jinggu MS6.6 earthquake and Ludian MS6.5 earthquake and their influence are discussed.