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《Chinese Journal of Sinica》 1978-03
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ELECTRICAL RESISTIVITY ANOMALY OBSERVED IN AND AROUND THE EPICENTRAL AREA PRIOR TO THE TANGSHAN EARTHQUAKE OF 1976

ZHAO YU-LIN QIAN FU-YE (State Seismological Bureau)  
Before the Tangshan earthquake, magnitude 7.8 on July 28, 1976, nine of the fourteen resistivity stations located within the region of Peking, Tientsin and Tangshan recorded gradual decreases in apparent electrical resistivity for a period of 2-3 years. The anomalous region as deduced from the records of these nine stations has a semi-major axis of about 150 km surrounding the epicenter and yet two of the stations located very close to the epicenter recorded rapidly decreasing apparent resistivity anomaly during a period of more than 2 months immediately before the earthquake. According to results of some field measurements in-situ of the apparent resistivity decrease due to compression of rock or soil layers near earth's surface, we estimated that the linear compressional strain of shallow layers in and around the epicentral area is about 3 × 10-5. Compressional strain of much the same order of magnitude has been observed by base line survey before the Tangshan earthquake.
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