STUDY ON THE RELATIONSHIP BETWEEN GOLMUD GEOMAGNETIC OBSERVATION DATA AND MODERATE EARTHQUAKES
The geomagnetic data of Golmud seismic monitoring center station in western China before several strong earthquakes in 2021-2022 were analyzed.It is considered that there are three kinds of abnormal chan-ges in Golmud geomagnetic field before the earthquake:the annual change of the daily mean magnetic devia-tion angle,the abnormal amplitude of the daily change of the magnetic deviation angle,and the abnormal verti-cal component of the"double low point".The three kinds of abnormalities were summarized and analyzed,and the extraction of the abnormal amplitude of the daily change of the magnetic deviation angle was further carried out.
Magnetic deviation angleDaily amplitudeSeismic magnetic anomaly
NETL
NSTL
万方数据
