使用当前地震小区划方法研究玉田低烈度异常

A Study on Low Intensity Anomaly in Yutian with The Current Microzoning Method

利用以前和最近所取得的玉田县浅层和深层的地质资料、波速资料和人工地震波现场测量资料，采用当前通行的地震小区划方法，对１９７６年唐山地震时出现的玉田低烈度异常区内外共２７个场点进行了地震地面运动的计算和分析，与实际震害指数作了比较，并进一步探讨了玉田低烈度异常的原因，考察了当前地震小区划方法的适用程度。

In this paper the ground motions of 27sites in Yutian county excited by the 1976 Tangshan earthquake are calculated with the current microzoning method, of which 15 sites located inside the low intensity area and 12 sites outside the area. The geological data, shear wave velocity data and the down hole measured data obtained through the artificial earthquake for shallow and deep layers in these sites are used. The calculated results are compared with the actual damage indexes. The cause of low intensity anomaly is discussed. ThuS the availability of the current microzoning methed is tested.