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地震形变资料表明,震中往往位于形变量较大或者形变差异剧烈的地方,也即大致上位于形变梯度矢量的方向,如果掌握某地区形变梯度的失量方向,尤其是掌握多地区形变梯度矢量方向,这对从形变资料推断未来可能发震的危险区域显然具有现实意义。当某地区有限长度水准路线水准点高程变化呈现较强的地形变信息,一定程度上表现为面的趋势倾斜时,用本文介绍的方法,根据水准点平面座标和高程可以计算其主倾斜方向和倾角。本文利用上海佘山地区基岩水准点资料计算出1984年5月21日南黄海6.2级地震前一年,其最大倾斜方位为NE43°,倾角0.16角秒;1975年9月2日郎家沙5.3级地震前,其主倾斜方位为NE28°,倾角0.08角秒。倾斜应变的方向基本上指向震中。
Earthquake deformation data show that the epicenter is often located in a large deformation or deformation of violent differences in place, that is roughly located in the direction of deformation gradient vector, grasping a region of the direction of the loss of deformation gradient, in particular, to master multi-regional deformation gradient vector direction , Which is obviously of practical significance for inferring the possible future earthquake-prone dangerous region from the deformation data. When the level elevation of a limited length level route in a certain region shows strong deformation information, which is partly expressed as the trend of slope, the main inclination direction can be calculated by the method described in this paper according to the coordinate and elevation of the level point plane And inclination. Based on the data of bedrock leveling of Sheshan area in Shanghai, this paper calculated the maximum tilt azimuth of NE43 ° and inclination angle of 0.16 arc second in the year prior to the M = 6.2 M44 M Huanghai Mound on May 21, 1984. On September 2, 1975, Langjiaisha 5.3 Before the earthquake, the main tilt azimuth NE28 °, dip 0.08 arc seconds. The direction of the diagonal strain points essentially to the epicenter.