地震研究

简要介绍了西南强震动台网对“6·24”宁蒗—盐源5.7级地震的记录获取及其初步处理情况; 根据强震动记录计算了地震动谱烈度,对谱烈度与宏观烈度的地面分布进行了比较; 并对此次地震的相对持时与能量持时、峰值加速度衰减、地震动主频随距离的变化等问题进行了初步计算分析。结果表明:由各台站强震动记录计算的谱烈度而修正得到的仪器烈度值与该处的宏观烈度均吻合,但谱烈度等值线长轴方向与宏观烈度长轴方向相差约20°; 地面峰值加速度的衰减快慢随震中距近远而呈现差异; 三分向加速度反应谱的主频,其垂向的衰减比水平向的衰减要慢; 地面地震动持时长短受诸多因素影响,除震源距外,场地条件的影响有时更显著。

The strong motion records and their data processing of Ninglang-Yanyuan M5.7 earthquake on Jun.24,2012 are introduced. Using strong motion records,we calculated the spectrum intensity and compared it with macroscopic intensity on ground distribution. We also preliminary calculated and analyzed the relative duration,energy duration,the attenuation of peak acceleration and the variation of predominant frequency over epicenter distance. The result showed that the instrument intensity corrected by the spectrum intensity which was calculated by strong motion recordings is concordant with the macroscopic intensity; however the long axis directions difference between spectrum intensity counter and macroscopic intensity is about 20°. The speed of ground peak acceleration attenuation varies from the distance of epicenter,and the attenuation of vertical predominant frequency of the three-component acceleration response spectrum was more slowly than that of horizontal. In addition,the duration of ground strong motion was restricted by many factors which include epicenter distance or site conditions at times.

引言
1 地质构造环境
2 观测台站及获取记录
3 谱烈度及其与宏观烈度对比
4 地震动其它特征
5 结语

表1 宁蒗—盐源5.7级地震强震台站及记录情况<br/>Tab.1 The recordings of Ninglang-Yanyuan M5.7 earthquake recorded by strong motion observation stations

表1 宁蒗—盐源5.7级地震强震台站及记录情况
Tab.1 The recordings of Ninglang-Yanyuan M5.7 earthquake recorded by strong motion observation stations

图1 宁蒗—盐源5.7级地震震中、Ⅵ度烈度圈及获取记录台分布图<br/>Fig.1 The distribution of epicenter of Ninglang-Yanyuan M5.7 earthquake,Ⅵ intensity contour and the strong motion observation stations of obtaining recordings

图1 宁蒗—盐源5.7级地震震中、Ⅵ度烈度圈及获取记录台分布图
Fig.1 The distribution of epicenter of Ninglang-Yanyuan M5.7 earthquake,Ⅵ intensity contour and the strong motion observation stations of obtaining recordings

图2 宁蒗—盐源5.7级主震的加速度记录(a)泸沽湖台;(b)红桥乡台;(c)九河乡台<br/>Fig.2 The acceleration recordings of Ninglang-Yanyuan M5.7 main earthquake(a)Lugu Lake Station;(b)Hongqiao Country Station; (c)Jiuhe Country Station SIζ=∫2.5∫0.1SV(T,ζ)dT.(1)

图2 宁蒗—盐源5.7级主震的加速度记录(a)泸沽湖台;(b)红桥乡台;(c)九河乡台
Fig.2 The acceleration recordings of Ninglang-Yanyuan M5.7 main earthquake(a)Lugu Lake Station;(b)Hongqiao Country Station; (c)Jiuhe Country Station SIζ=∫2.5∫0.1SV(T,ζ)dT.(1)

表2 宁蒗—盐源5.7级地震谱烈度值、修正谱烈度值、仪器烈度与宏观烈度<br/>Tab.2 Spectrum,modified spectrum intensity values,instrumental and macroscopic intensity of Ninglang-Yanyuan M5.7 earthquake

表2 宁蒗—盐源5.7级地震谱烈度值、修正谱烈度值、仪器烈度与宏观烈度
Tab.2 Spectrum,modified spectrum intensity values,instrumental and macroscopic intensity of Ninglang-Yanyuan M5.7 earthquake

图3 宁蒗—盐源5.7级地震宏观烈度和谱烈度分布图<br/>Fig.3 Distribution of macroscopic intensity and spectrum intensity of Ninglang-Yanyuan M5.7 earthquake

图3 宁蒗—盐源5.7级地震宏观烈度和谱烈度分布图
Fig.3 Distribution of macroscopic intensity and spectrum intensity of Ninglang-Yanyuan M5.7 earthquake

图4 宁蒗—盐源5.7级地震加速度峰值的地面衰减<br/>Fig.4 Ground attenuation of acceleration peak of Ninglang-Yanyuan M5.7 earthquake

图4 宁蒗—盐源5.7级地震加速度峰值的地面衰减
Fig.4 Ground attenuation of acceleration peak of Ninglang-Yanyuan M5.7 earthquake

图5 宁蒗—盐源5.7级地震加速度反应谱卓越频率随距离的变化<br/>Fig.5 Predominant frequency of acceleration response spectra of Ninglang-Yanyuan M5.7 earthquake varying with epicentral distance

图5 宁蒗—盐源5.7级地震加速度反应谱卓越频率随距离的变化
Fig.5 Predominant frequency of acceleration response spectra of Ninglang-Yanyuan M5.7 earthquake varying with epicentral distance

表3 各台站加速度时程的几种相对持时<br/>Tab.3 The several relative durations of acceleration time history recorded by each strong motion station

表3 各台站加速度时程的几种相对持时
Tab.3 The several relative durations of acceleration time history recorded by each strong motion station

崔建文,李世成,高东,等.2006.西南分区地震动衰减关系[J].地震研究,29(4):386-391.
胡聿贤.2006.地震工程学(第二版)[M].北京:地震出版社.
李世成,崔建文,韩新民.2003.云南地区地震烈度衰减特征研究[J].中国地震,19(3):287-294.
李世成,崔建文,张潜,等.2011.2009年姚安6.0级地震强震动应急观测的数据处理及其震害启示[J].灾害学,26(4):82-88.
林淋,孙景江.2011.不同地震动参数与地震烈度相关性对比研究[J].地震工程与工程振动,31(1):6-10.
任叶飞,温瑞智,周宝峰.2011.强震动记录编目—以汶川余震流动观测记录为例[J].震灾防御技术,6(4):406-415.
王玉石,周振华,兰日清.2010a.利用修正谱烈度确定我国西部地区仪器烈度的建议方法[J].应用基础与工程科学学报,18(supp):2-11.
王玉石.2010b.地震动强度及其特征分析[D].哈尔滨:中国地震局工程力学研究所,36-53.
云南防震减灾网.2012.姚安MS6.5地震震源破裂过程研究.(2012-07-16)[2012-07-29].http://www.eqyn.com/manage/html/ff808181126bebda01126bec4dd00001/yjdzzt/index.html.
周雍年.2011.强震动观测技术[M].北京:地震出版社.
Boore D M,Bommer J J.2005.Processing of strong-motion accelerograms:needs,options and consequences[J].Soil Dynamics and Earthquake Engineering,25(2):93-115.
Boore D M,Stephens C D,Joyner W B.1999.Comments on baseline correction of digitalstrongmotion data:Examples from the 1999 Hector Mine,California,earthquake[J].BSSA,92(4):1 543-1 560.
GB/T17742-2008,中国地震烈度表[S].
Husid R L.1969.Analisis de Terremotos:Analisis General,Revista del IDIEM[J].Santiago Chile,8(1):21-42.
Kazi R,Karim,Fumio Yamazaki.2002.Correlation of JMA Instrumental Seismic Intensity with Strong Motion Parameters[J].Earthquake Engineering and Structural Dynamics,31(5):1191-1212.
Li X J,Zhou Z H,Moh Huang,et al.2008.Preliminary Analysis of Strong-Motion Recordings from the Magnitude 8.0 Wenchuan,China,Earthquake of 12 May 2008[J].Seismological Research Letters,79(6):844-854.
Trifunac M D,Brady A G.1975. On the Correlation of Peak Acceleration of Strong Motion with Earthquake Magnitude Epicentral Distance and Site Condition Proc[D].US Nat Conf Earthquake Engineering.43-52.

备注

引言

1 地质构造环境

2 观测台站及获取记录

3 谱烈度及其与宏观烈度对比

4 地震动其它特征

5 结语

期刊信息