干旱区生态环境知识资源中心(Arid): 2013年岷县M_s6.6地震区域台阵强震动记录衰减与烈度线比较分析

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	2013年岷县M_s6.6地震区域台阵强震动记录衰减与烈度线比较分析
其他题名	Strong Motion Records and Attenuation Analysis of July 22, 2013, Minxian M_s6.6 Earthquake
	何新社; 刘旭宙; 潘颖凌; 田秀丰
来源期刊	地震工程学报
ISSN	1000-0844
出版年	2013
卷号	35 期号:4 页码:774-779
中文摘要	2013年7月22日甘肃岷县6.6级地震是十年来发生在甘肃省破坏性最大的地震。本文对距震中距18~ 218 km以内的22个强震动台所获取的主震记录进行了分析处理,研究了该次地震在强震动台站分布方向上的衰减规律。将根据衰减规律得出的烈度区域与震后灾害评估的烈度图比较后发现,分析得出的VIII度、VII度区范围相对略大,VI度以下区域范围则大致相当,其原因应该与近场的强震动记录较少有关系。
英文摘要	The Minxian M_s6.6 earthquake, the largest earthquake to occur in Gansu province during the past decade, devastated areas in Minxian and Zhangxian and affected counties in Longnan and the Gannan Tibetan Autonomous Prefecture more than 100 km from the epicenter. During the tenth five-year plan, 20 strong-motion stations have been erected in southeastern Gansu, most of which recorded the main shock. In addition, several stations in Lanzhou also recorded strong motion. After preliminary processing of the strong motion data, we determined that the majority of stations that recorded the main shock are broadly distributed with same strike; therefore, a simplified mathematical model was developed to analyze the attenuation of these strong motion records. The epicentral distances of the strong motion stations recording the main shock are 18 km to more than 200 km. The largest peak ground acceleration was recorded by the Minxian strong motion station at 172.5 cm/s2 with an epicentral distance of 18 km. For the free-field soil observation conditions, these values essentially reflect the local ground acceleration; therefore, the extent of damage reached VIIIO. Stations near Lanzhou with epicentral distances close to 200 km also recorded the motion, with peak acceleration between 1 cm/s2 arid 8 cm/s2. Chinese ground motion attenuation data originally used ground motion data observed in the Unit-ed States as a reference before such information was recorded in China. In recent years, a Chinese digital strong motion observation network was been created to provide important data in earthquake-prone regions for in- depth research of Chinese ground motion attenuation. Therefore, the study of Minxian M_s6.6 earthquake ground motion attenuation also has practical significance in areas outside of southeast Gansu. In the study of peak ground acceleration attenuation, the following formula is often used: lg7= c1 + C2 M+ C3 M2+c4lg [R + c5exp (c6 M)],...............(1) where y is the peak ground acceleration, M is the magnitude, R is the epicentral distance, and C1, C2, C3, c4, c5, and c6 are regression coefficients. When the magnitude is determined, equation (1) can be simplified to: lg y=A+ Blg (R+Ro)..............................................(2) The correspondence of the parameters is as follows: A = c1 + c2M+ c3 M2; B = C4; Ro = c5exp (c6 M). We fit the peak ground acceleration attenuation curve by using formula (2). Because the peak ground acceleration from the station on a thick layer (bedrock) would be significantly greater (smaller), data from five stations were removed during the attenuation curve fitting. We took Ro as 30 for lg y and lg (R + R0) to obtain the best linearity. The results show that the peak ground acceleration attenuation curves of the three components had the same shape. However, the value of limit acceleration, or the value of A+ Blg (R0) differed. The formulas of the peak ground acceleration attenuation of three components are: EW: lg y= -2.847 7lg(R + 30) + 7.056 9; R2= 0.846 6 NS: lg 7 = -1793 5lg(R + 30) + 6.984 4;R2 = 0.860 3 UD: lg y=-2.796 9*lg(R + 30) + 6.751 8; R2 = 0.849 7. We compared the results with the disaster assessment intensity map to determine that the ranges of VIII and VII degrees given by our results are slightly larger because of fewer near-field strong motion records were used.
中文关键词	岷县M_s6.6地震 ; 强震动记录 ; 衰减 ; 烈度区
英文关键词	Minxian M_s6.6 earthquake strong motion record attenuation seismic region
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5085345
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229393
作者单位	中国地震局兰州地震研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	何新社,刘旭宙,潘颖凌,等. 2013年岷县M_s6.6地震区域台阵强震动记录衰减与烈度线比较分析[J],2013,35(4):774-779.
APA	何新社,刘旭宙,潘颖凌,&田秀丰.(2013).2013年岷县M_s6.6地震区域台阵强震动记录衰减与烈度线比较分析.地震工程学报,35(4),774-779.
MLA	何新社,et al."2013年岷县M_s6.6地震区域台阵强震动记录衰减与烈度线比较分析".地震工程学报 35.4(2013):774-779.