摘要
运用考虑场地效应的震动图快速生成方法,综合考虑震中地区地质构造背景、震源机制解结果、中国西部地区地震动参数衰减特征及测震台站记录信息,估计了2014年2月12日新疆于田7.3级地震震动图。结果显示,于田地震最高震动烈度可能达到Ⅸ度,基本上没有乡镇直接位于震动烈度Ⅷ度和Ⅸ度区内。震动烈度Ⅶ度区的面积约15 000km2,阿羌乡和叶亦克乡的震动烈度可能达到Ⅶ度。Ⅵ度区的面积约为43 000km2,民丰县、于田县、博斯坦乡、奴尔乡、阿热勒乡、英巴格乡、尼雅乡、萨勒吾则克乡等可能遭受震动烈度Ⅵ度的破坏。其次于田县和策勒县之间的乡镇地处Ⅵ度区的分界线附近,由于该地区土层的剪切波速相对较低,地震动容易产生放大,可能加重该地区的震害。最后,与震中距相对较小的和田台相比较,位于破裂走向上的且末测震台出现了限幅的现象,可能是因为地震的方向性效应进一步增大了该地区的震动程度。
Based on geological structure in the epicenter area, focal mechanism solutions of this earthquake, the ground motion attenuation in western China, data of seismic stations and local site effect, Shakemap was acquired after the Yutian, Xinjiang earthquake on 12 February 2014. The results show that maximum shaking intensity may reach IX for Yutian earthquake, and there are no towns located in the area with shaking intensity VIH and IX. Area with the shaking intensity VII is about 15 000kin2. Shaking intensity of Aqiang and Yeyike town may reach VII. Area with shaking intensity VI is about 43000kin2, which includes Minfeng, Yutian County, Bositan, Nuer, Arele, Yingbage, Niya, Salewuzeke town, etc. In villages and towns between Yutian and Cele County, which are near the boundary of intensity VI area, earthquake damage may aggravate, because shear wave velocity of the soil in this area is relatively low, and seismic ground motion is peculiarly prone to be amplified. Amplitude limiting phenomenon occurred in the Qiemo seismic station, which is located in the direction of rupture, instead of in Hetian seismic station, to which the epicentral distance is less than that to Qiemo. This may be due to the directivity effect of this earthquake, which increased the level of shaking in this region.
出处
《地震地质》
EI
CSCD
北大核心
2015年第2期524-528,共5页
Seismology and Geology
基金
中国地震局地球物理研究所基本科研业务专项(DQJB13B19)
地震行业科研专项(201308018)
"十二五"国家科技支撑计划项目(2012BAK15B01-04)共同资助
关键词
震动图
震动烈度
于田地震
场地效应
Shakemap, shaking intensity, Yutian earthquake, site effect
