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十九世纪末,人们已注意到地震与地磁变化之间的关系。但是,1950年以前,由于使用仪器的观测精度低,稳定性差,又很少考虑消除其它因素(如地磁日变化,磁暴等)的干扰,因此,这些观测结果是不可靠的。 五十年代以后,高精度、高稳定性的质子磁力仪的发明,以及磁通门磁力仪、光泵磁力仪与超导磁力仪的发展与改进,为地磁场的精确测量提供了条件,也从根本上改变了地震磁现象的观测状况,并取得了一些较为可靠的震例资料。
The late nineteenth century, people have noticed the relationship between earthquakes and changes in geomagnetic. However, before 1950, these observations were unreliable due to the low precision and poor stability of the instruments used, and their negligible interference with other factors (such as geomagnetic diurnal variations and magnetic storms). Since the 1950s, the invention of a proton magnetometer with high precision and high stability, as well as the development and improvement of a fluxgate magnetometer, an optical pumping magnetometer and a superconducting magnetometer, has provided the conditions for the accurate measurement of the geomagnetic field. It fundamentally changed the observation status of the earthquake magnetic phenomena and obtained some reliable earthquake cases data.