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一、美国观测计划据约翰斯顿(Johnston)1978年报道,美国地质调查局的地磁研究有两个主要方向:(1)测定伴随浅源地震的地磁特性—震磁效应。(2)测量活动断层附近区域的地磁场长期变化,以确定由一般构造活动,实际上它最终将引起地震的构造活动所产生的地磁变化,通常称之为“构造磁效应”。美国主要的观测现场是圣安德烈斯断层,已经实施了三类试验,以测定此断层的构造磁效应。第一类试验是用一对灵敏度为0.25伽马的
I. US OBSERVATIONS According to a report by Johnston in 1978, there are two main directions for geodesy in the US Geological Survey: (1) To determine the geomagnetic properties associated with shallow earthquakes - the seismic magnetic effect. (2) Long-term changes in the geomagnetic field in the vicinity of the active fault are measured to determine the geomagnetic changes produced by the general tectonic activity that in effect will eventually cause the tectonic activity of the earthquake, commonly referred to as “tectonic magnetism.” The main observation site in the United States is the San Andres Fault, which has conducted three types of tests to determine the structural magnetic effects of this fault. The first type of test is a pair of sensitivity of 0.25 gamma