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研究地温的变化作为预测地震的一种前兆手段,已为大家所承认,在一般情况下,地下深处的温度变化很小,其变化曲线基本平直,而且离地表越深,越与地表气温变化无关。 在地震前,地温有异常,由于地球本身的热容量很大,因而地温变化幅度也不是很大。据1975年2月海城7.3级和1976年7月唐山7.8级地震前,震中区地下80厘米的地温才上升了1.5℃,因此,这对测温元件提出了二项要求:(一)稳定可靠;(二)具有较高的灵敏度。
Studying the change of geothermal temperature as a means of predicting earthquakes has been acknowledged by everyone. Under normal circumstances, the temperature in the deep underground is very small and its curve is basically flat. The deeper it is from the Earth’s surface, the more it is related to the surface temperature Change has nothing to do. Before the earthquake, there was an anomaly in the ground temperature. Due to the large heat capacity of the earth itself, the change of the ground temperature was not large. According to the February 1975 Haicheng 7.3 and July 1976 Tangshan 7.8 earthquake, the epicenter 80 cm underground temperature increased by 1.5 ℃, therefore, the temperature measuring element proposed two requirements: (a) stable Reliable; (B) with high sensitivity.