在我国大陆发生的一些地震之前,曾观测到重力,远震 P 波及近震 Pn 波走时残差和上地幔电导率等异常,这些异常具有空间范围广、时间长和幅度大的特点。用已知的地震孕育模式和前兆模式解释这些异常是困难的。本文试用地球深部物质在温度、压力改变时介质物理性质的变化作为这类异常的可能原困。 Prior to some earthquakes that occurred in mainland China, gravity, teleseismic P and near-Earth Pn wave traveltime residuals and upper mantle conductivity anomalies were observed. These anomalies have the characteristics of wide spatial range, long time and large amplitude. It is difficult to explain these anomalies using known models of earthquake gestation and precursors. In this paper, the changes of the physical properties of the deep earth matter in the earth under the change of temperature and pressure are probable problems of this kind of anomaly.