孕震过程中重力和倾斜负荷潮的变化
THE VARIATIONS OF THE GRAVITY AND TILT LOADING TIDE IN SEISMOGENIC PROCESS
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摘要: 地震前孕震区弹性参数发生变化,从而导致地震波速变化.本文根据波速异常现象并利用负荷潮汐研究结果,估算了中国沿海某些地区在孕育一次七级地震时 M2负荷潮汐所引起的重力和倾斜的变化.发现重力变化甚微,倾斜变化可观.建议在确定地震重点区的沿海进行一些倾斜潮汐观测.Abstract: The elastic parameter variations within seismic source region prior to an earthquake result in variations of the seismic wave velocity. In this paper, on the basis of the phenomenon of wave velocity anomaly, before an earthquake of M = 7, the distortion of the Earth's gravity and tilt by the M2 loading tide at some places near the coastline of China have been estimated by means of the results of the loading tide studies. We showed that the distortion of the gravity is very little and that of the tilt is observable. It is suggested that tilt observations should be done in the seismic active areas adjacent to the sea.
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[2] 毛伟建,负荷勒夫数的理论计算,测量与地球物理集刊,第5号,1983,
[3] C. H. Scholz, L. R. Sykes and Y. P. Aggarwal, Earthquake prediction: a physical basis, Scierzce,181, 4102, 803—— 809, 1973.
[4] 许厚泽等,海洋潮汐对重力和倾斜潮汐观测的影响,中国科学院测量与地球物理研究所专刊,第4号,1981.
[5] 毛伟建,地球表面质量负荷的静态响应,地球物理学报,27, 1, 74——83, 1984.
[6] 冯德益,地震波速异常,地震出版社,1981.
[7] 许厚泽等,海洋潮汐对重力潮汐观测的影响,地球物理学报,25, 2, 120——129, 1982,
[8] 冯锐,地倾斜与地震,地震出版社,1978.
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