Seismomagnetic research in Beijing and its adjacent area, China

During 1993–2002, a field experiment in the Miyun reservoir was carried out. A relation coefficient of −0.063 nT/m was obtained between geomagnetic changes and water depth variations in the reservoir, which agrees with piezomagnetism. The tectonomagnetic investigations suggested static and dynamic tectonomagnetic effects of the active faults. These effects provide useful information for monitoring the potential earthquakes in and near the active faults in the future. The seismomagnetic observation and research in Beijing and its adjacent area show that seismomagnetic precursors are a near-field effect, the anomalous amplitude is 2–11 nT, and the precursor time is several days to one year. These results could be applied in earthquake prediction study.