Observations and studies of electromagnetic waves during the approaching of earthquakes

This article introduces the practical observation results of pre-earthquake electromagnetic radiations at the network of monitoring stations in Jiangsu region in resent years and discusses the electromagnetic wave precursors during the approaching period of earthquakes based on the observations of the electromagetic radiation signals before theMs 6.0 Liyang earthquake of 1979 in Jiangsu province, theMs 5.9 Heze earthquake of 1983 in Shandong province and theMs 6.2 South Yellow Sea earthquake of 1984.