地震研究

2014年10月7日云南景谷发生M_S6.6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M_S5.8、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 M_S6.6 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 M_S5.8 and M_S5.9 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 M_S6.6 earthquake and Ludian M_S6.5 earthquake and their influence are discussed.

引言
1 强震动观测台站及其记录的强地面
2 地震动特征
3 结论与讨论

表1 MS6.6强震动记录中PGA>70 cm/s2的强震动台站场地条件<br/>Tab.1 Field conditions of strong motion station with PGA>70 cm/s2 in the MS6.6 mainshock recording

表1 MS6.6强震动记录中PGA>70 cm/s2的强震动台站场地条件
Tab.1 Field conditions of strong motion station with PGA>70 cm/s2 in the MS6.6 mainshock recording

图1 获取景谷MS6.6主震记录的强震动台站及MS6.6、MS5.9、MS5.8三次地震的PGA等值线分布<br/>Fig.1 Distribution of stations of obtaining the Jinggu MS6.6 mainshock recording and the PGA contours for MS6.6,MS5.9 and MS5.8 earthquakes

图1 获取景谷MS6.6主震记录的强震动台站及MS6.6、MS5.9、MS5.8三次地震的PGA等值线分布
Fig.1 Distribution of stations of obtaining the Jinggu MS6.6 mainshock recording and the PGA contours for MS6.6,MS5.9 and MS5.8 earthquakes

表2 3次地震强震动记录PGA>10 cm/s2的台站参数及峰值加速度<br/>Tab.2 Stations parameters and peak acceleration of strong motion with PGA>10 cm/s2 of three mainshocks

表2 3次地震强震动记录PGA>10 cm/s2的台站参数及峰值加速度
Tab.2 Stations parameters and peak acceleration of strong motion with PGA>10 cm/s2 of three mainshocks

图2 部分台站记录到的景谷MS6.6(a)、 MS5.9(b)和MS5.8(c)地震北南向地震动加速度时程<br/>Fig.2 Acceleration time history of Jinggu MS6.6(a)、 MS5.9(b)和MS5.8(c)earthquakes in NS recorded by some stations

图2 部分台站记录到的景谷MS6.6(a)、 MS5.9(b)和MS5.8(c)地震北南向地震动加速度时程
Fig.2 Acceleration time history of Jinggu MS6.6(a)、 MS5.9(b)和MS5.8(c)earthquakes in NS recorded by some stations

图3 景谷MS6.6地震与鲁甸MS6.5地震PGA随距离的变化曲线<br/>Fig.3 Curve of PGA for Jingu MS6.6 and Ludian MS6.5 earthquakes varied with distance

图3 景谷MS6.6地震与鲁甸MS6.5地震PGA随距离的变化曲线
Fig.3 Curve of PGA for Jingu MS6.6 and Ludian MS6.5 earthquakes varied with distance

图4 强震动台站记录的景谷MS6.6和鲁甸MS6.5地震加速度反应谱和景谷地区设计反应谱<br/>Fig.4 Acceleration response spectrum of Jinggu MS6.6 and Ludian MS6.5 earthquakes recorded by strong motion station

图4 强震动台站记录的景谷MS6.6和鲁甸MS6.5地震加速度反应谱和景谷地区设计反应谱
Fig.4 Acceleration response spectrum of Jinggu MS6.6 and Ludian MS6.5 earthquakes recorded by strong motion station

图5 永平强震动台记录到的景谷MS6.6(a)、MS5.9(b)和MS5.8(c)地震北南向地震动时频分布和相应加速度时程<br/>Fig.5 Time-frequency distribution of strong motion recording of Jinggu MS6.6(a)、MS5.9(b)和MS5.8 (c)earthquakes in NS recorded by Yongping Strong Motion Station and the corresponding acceleration time history

图5 永平强震动台记录到的景谷MS6.6(a)、MS5.9(b)和MS5.8(c)地震北南向地震动时频分布和相应加速度时程
Fig.5 Time-frequency distribution of strong motion recording of Jinggu MS6.6(a)、MS5.9(b)和MS5.8 (c)earthquakes in NS recorded by Yongping Strong Motion Station and the corresponding acceleration time history

图6 主震仪器烈度及实际考察烈度的分布<br/>Fig.6 Distribution of intensities of mainshock instrument and real site investigation

图6 主震仪器烈度及实际考察烈度的分布
Fig.6 Distribution of intensities of mainshock instrument and real site investigation

图7 景谷MS6.6主震及两次MS5.9、MS5.8强余震仪器烈度分布<br/>Fig.7 Distribution of instrument intensity for the Jinggu MS6.5 mainshock and two MS5.9、MS5.8 strong aftershocks

图7 景谷MS6.6主震及两次MS5.9、MS5.8强余震仪器烈度分布
Fig.7 Distribution of instrument intensity for the Jinggu MS6.5 mainshock and two MS5.9、MS5.8 strong aftershocks

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备注

引言

1 强震动观测台站及其记录的强地面

2 地震动特征

3 结论与讨论

期刊信息