2014年云南鲁甸6.5级地震强震动观测记录及初步分析
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摘要
2014年8月3日云南鲁甸发生MS6.5地震,在震中及其周边地区分布的中国数字强震动台网的81个台站获取了这次地震的主震强震动记录。特别是位于极震区鲁甸龙头山镇财政所强震动台,完整记录到这次地震的地震动时程,其东西向PGA达948.5 cm/s2,该台站周边多栋多层建筑物底层完全倒塌和损毁,与记录所反映的强烈震动相吻合。初步分析强震动观测记录,讨论了本次地震的震中位置、破裂方向和强震动衰减速率等问题。
A MS6. 5 earthquake occurred in Ludian County of Yunnan Province on Aug. 3,2014. The strong motion caused by the mainshock was recorded by 81 strong motion observation stations which are located around the epicenter and its adjacent area. Especially,the strong motion station which is located at Longtoushan Office of Finance in the meizoseismal area perfectly recorded the strong ground motion time history of the mainshock,and the PGA of it is 948. 5 cm ·s- 2in EW. The ground floors of many buildings around the Longtoushan strong motion stations damaged seriously or collapsed,which was consistent with the strong shock reflected in the recording. A preliminary analysis on the strong motion recordings were also done,based on these analysis,the problems about epicenter location,rupture direction and the attenuation of strong motion of Ludian MS6. 5 earthquake are also discussed.
A MS6. 5 earthquake occurred in Ludian County of Yunnan Province on Aug. 3,2014. The strong motion caused by the mainshock was recorded by 81 strong motion observation stations which are located around the epicenter and its adjacent area. Especially,the strong motion station which is located at Longtoushan Office of Finance in the meizoseismal area perfectly recorded the strong ground motion time history of the mainshock,and the PGA of it is 948. 5 cm ·s- 2in EW. The ground floors of many buildings around the Longtoushan strong motion stations damaged seriously or collapsed,which was consistent with the strong shock reflected in the recording. A preliminary analysis on the strong motion recordings were also done,based on these analysis,the problems about epicenter location,rupture direction and the attenuation of strong motion of Ludian MS6. 5 earthquake are also discussed.
引文
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崔建文,李世成,高东,等.2006b.云南分区地震动衰减关系[J].地震研究,29(4):386-391.
非明伦,余庆坤,谢英情,等.2006.鲁甸5.6级地震震害分析[J].地震研究,29(1):87-91.
解丽,谢英情,非明伦,等.2008.2003年鲁甸5.1、5.0级地震震害异常影响因素分析[J].地震研究,31(增刊):607-611.
刘明才.2005.小波分析及其应用[M].北京:清华大学出版社出版.
阮祥,程万正.2008.云南鲁甸3次MS≥5.0地震破裂参数的研究[J].地震学报,30(1):97-102.
闻学泽,杜方,易贵喜,等.2013.川滇交界东段昭通、莲峰断裂带的地震危险性背景[J].地球物理学报,56(10):3361-3367.
俞言祥,李山有,肖亮.2013.为新区划图编制所建立的地震动衰减关系[J].震灾防御技术,8(1):24-33.
周雍年.2006.中国大陆的强震动观测[J].国际地震动态,(11):1-6.
LI X.J.,ZHOU Z.H.,YU H.Y.,et al.2008.Strong Motion Observationand Recordings from Great Wenchuan Earthquake[J].EarthquakeEngineering and Engineering Vibration,7(3):235-246.