| 甘肃岷县漳县6.6级地震强震动观测记录与初步分析 |
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| 引用本文： | 田秀丰,李佐唐,徐钦,党红,何新社.甘肃岷县漳县6.6级地震强震动观测记录与初步分析[J].西北地震学报,2013,35(3):497-502. |
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| 作者姓名： | 田秀丰 李佐唐 徐钦 党红 何新社 |
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| 作者单位： | 中国地震局兰州地震研究所;;中国地震局兰州地震研究所;;中国地震局兰州地震研究所;;中国地震局兰州地震研究所;;中国地震局兰州地震研究所; |
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| 基金项目： | 兰州地球物理国家野外科学观测研究站开放基金(2013Y04) |
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| 摘 要： | 2013年7月22日甘肃省定西市岷县漳县交界(东经104.2°,北纬34.5°)发生M6.6地震。甘肃强震动台网在该地区覆盖良好,获得了丰富的主震加速度记录。本文收集整理了此次地震中各强震动台站获得的加速度记录资料并进行了基本处理;经统计分析绘出了峰值加速度分布图。
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| 关 键 词： | 岷县漳县6.6级地震 强震动记录 峰值加速度 |
The Strong Motion Records and Preliminary Analysis for Minxian-Zhangxian M6.6 Earthquake in Gansu Province |
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| TIAN Xiu-feng;,LI Zuo-tang;,XU Qin;,DANG Hong; and HE Xin-she;.The Strong Motion Records and Preliminary Analysis for Minxian-Zhangxian M6.6 Earthquake in Gansu Province[J].Northwestern Seismological Journal,2013,35(3):497-502. |
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| Authors: | TIAN Xiu-feng; LI Zuo-tang; XU Qin; DANG Hong; and HE Xin-she; |
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| Institution: | Lanzhou Institute of Seismology,CEA;;Lanzhou Institute of Seismology,CEA;;Lanzhou Institute of Seismology,CEA;;Lanzhou Institute of Seismology,CEA;;Lanzhou Institute of Seismology,CEA; |
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| Abstract: | The Minxian-Zhangxian MS6.6 earthquake occurred on July 22,2013,at the junction of Minxian and Zhangxian,Dingxi,Gansu Province(E 104.2°,N 34.5°).The depth of this widespread earthquake was shallow,which caused huge casualties and property losses.In this region,numerous professional strong motion observation stations recorded valuable acceleration records that accurately reflect the ground vibration of the main shock in the corresponding region of Gansu province and play an important role in the evaluation of earthquake development trends.In the present study,these acceleration records were collected and preliminary processed,and the results of peak ground acceleration were statistically analyzed.We determined that 47strong motion stations obtained acceleration records,which included four types of strong motion seismographs such as MR2002,Etna,GSR-18,and GSMA-2400.The Minxian strong motion station was the closest to the epicenter at a distance of 18.0km and peak accelerations of 160.7gal(EW),172.5gal(NS),and 78.4gal(vertical).The farthest station from the epicenter was Songshan at a distance of 297.3km and peak accelerations of 3.3gal(EW),3.1gal(NS),and 2.0gal(vertical).By calculation,we ascertained that the EW,NS,and vertical acceleration values were 1.2~160.7gal,0.4~172.5gal,and 0.4~78.4gal, respectively.This earthquake decayed quickly,and the peak acceleration of stations 100km from the epicenter was only approximately 10gal.For this earthquake,the Minxian station showed the largest peak acceleration.
Located in the Minyang township of Minxian,this station is situated in a good observation environment with stable equipment;therefore,the records obtained by this station are reliable.In addition,the peak ground acceleration of each station gradually reduced with epicentral distance.However,But the effects of anisotropic media and site conditions may have resulted in unequal peak ground acceleration values for different locations at the same epicentral distance.Although the Lintan strong motion station was 79.5km from the epicenter,its peak acceleration was only approximately 5gal.The Songshan was farthest from epicenter;however,its peak acceleration was not minimal.These special conditions may be associated with local geological formations and site environment.On the basis of the peak acceleration obtained by each station,we used the Kriging interpolation method and plotted the peak acceleration map of the Minxian-Zhangxian earthquake.The simulated values accurately reflected the ground motion intensity of the earthquake for each observation point to provide basic information for research on the characteristics of strong ground motion and seismic engineering.Moreover,this map can provide an important basis for rapid damage assessment and earthquake emergency planning.In this study,the work was preliminary pending further research after accumulation of supplemental data. |
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| Keywords: | Minxian-Zhangxian M6 6 earthquake strong motion records peak ground acceleration |
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