强震前地下水活动引起的垂线变化
DEVIATION OF THE VERTICAL CAUSED BY CHANGE OF GROUND WATER LEVEL BEFORE A STRONG EARTHQUAKE
-
摘要: 本文分析了引起强震前天文测时测纬异常现象的原因问题,认为这种异常主要是地下水活动引起垂线变化的结果.垂线变化包括重力场水平分量变化和垂直分量变化,前者可引起测时测纬异常.地下水活动的主要形式是垂直迁移,这种垂直迁移又沿着一定的水平方向传递.从测时测纬的异常形态和地下水的活动规律,可以分析出应力场变化的某些规律.地下水的这种活动,引起的重力场水平分量变化远远大于垂直分量的变化,两者的变化形式也很不同.Abstract: The question of the cause of the anomalous deviation of the results of the astronomical time and latitude determinations before a strong earthquake has been analysed in this paper. It is believed that variation of the ground water level resulting in the deviation of the vertical chiefly gives rise such anomalous phenomena. The deviation of the vertical consists of the change of the horizontal and vertical components of the gravity field, the former can cause anomalies in the astronomical determinations of time and latitude.Migration of ground water level is mainly in the vertical direction. Such migration can be transmmitted to a certain extent in the horizontal direction. From the anomalous time and latitude determinations and the variation of ground water level, one may notice some regularities of the change of the tectonic stress field. The variation of the horizontal gravity component caused by ground water level migration is much larger than that of the vertical component, they are also quite different in appearance.
-
-
[1] 李致森、张国栋、张焕志、刘学军,天文测时测纬的一种短时间异常与台站附近强震的对应关系,地球物理学报,21,4,1978.
[2] 唐山地震前嫌临前兆资料,地震出版社,1977
[3] 岛崎邦彦,プレートラヶス地震,日本の科学と技衡,1976[1] 李致森、张国栋、张焕志、刘学军,天文测时测纬的一种短时间异常与台站附近强震的对应关系,地球物理学报,21,4,1978.
[2] 唐山地震前嫌临前兆资料,地震出版社,1977
[3] 岛崎邦彦,プレートラヶス地震,日本の科学と技衡,1976
计量
- 文章访问数: 1094
- HTML全文浏览量: 15
- PDF下载量: 116
下载:
