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从位场理论的观点讨论了场和源的概念,建议将“场兆”改称为构造前兆,将“源兆”称为震源前兆。文中还分析了震源体与各种前兆观测方法探测的深度,并根据地磁与重力观测方法不同的物理基础和地质基础,指出震磁效应对于研究震源前兆的特殊意义。文中还介绍了1976年唐山地震前观测到震源前兆的部分实际地磁资料。
The concept of field and source is discussed from the viewpoint of field theory. It is suggested that “field trillion” should be renamed as “tectonic precursor” and “source trillion” be called precursory source. The paper also analyzes the depth of the source body and various precursory observation methods, and points out the special significance of the seismic magnetic effect for the study of the source precursors according to the different physical basis and geological basis of the geomagnetic and gravity observation methods. The article also introduces some actual geomagnetic data of the source precursors observed before the Tangshan earthquake in 1976.