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INVESTIGATION OF PREPARATORY PROCESS OF TANGSHAN EARTHQUAKE ACCORDING TO DIGITAL FILTERING OF THE DATA FOR UNDERGROUND WATER

Zhongxi Zheng

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Abstract

The data of underground water levels from 13 deep well scattered around the epicenter about 180 km before Tangshan earthquake, are processed by use of the pure amplitude, point resistance and the band pass digital filters. The results show that there are abnormal drops of water levels in the deep wells before the main shock, and such drops appear first at the distance of about 100 km from the epicenter. Then, they were propagated with velocity of 5-6 km/month both towards and away from the epicenter. This pattern is in accord with the time and spatial distributions of the small earthquakes occurring in the same area. It was suggested that the preparatory process of Tangshan earthquake can be divided into three stages: stage Ⅰ, from Jan. 1972 to Dec. 1974; stage Ⅱ, from Jan. 1975 to Apr. 1976; stage Ⅲ, from Apr. 1976 to the occurrence of Tangshan earthquake.

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What this paper is about

The data of underground water levels from 13 deep well scattered around the epicenter about 180 km before Tangshan earthquake, are processed by use of the pure amplitude, point resistance and the band pass digital filters. The results show that there are abnormal drops of water levels in the deep wells before the main shock, and such drops appear first at the distance of about 100 km from the epicenter. Then, they were propagated with velocity of 5-6 km/month both towards and away from the epicenter. This pattern is in accord with the time and spatial distributions of the small earthquakes occurring in the same area. It was suggested that the preparatory process of Tangshan earthquake can be divided into three stages: stage Ⅰ, from Jan. 1972 to Dec. 1974; stage Ⅱ, from Jan. 1975 to Apr. 1976; stage Ⅲ, from Apr. 1976 to the occurrence of Tangshan earthquake.

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Available abstract

The data of underground water levels from 13 deep well scattered around the epicenter about 180 km before Tangshan earthquake, are processed by use of the pure amplitude, point resistance and the band pass digital filters. The results show that there are abnormal drops of water levels in the deep wells before the main shock, and such drops appear first at the distance of about 100 km from the epicenter. Then, they were propagated with velocity of 5-6 km/month both towards and away from the epicenter. This pattern is in accord with the time and spatial distributions of the small earthquakes occurring in the same area. It was suggested that the preparatory process of Tangshan earthquake can be divided into three stages: stage Ⅰ, from Jan. 1972 to Dec. 1974; stage Ⅱ, from Jan. 1975 to Apr. 1976; stage Ⅲ, from Apr. 1976 to the occurrence of Tangshan earthquake.

Key concepts: Epicenter, Seismology, Stage (stratigraphy), Geology, Paleontology

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INVESTIGATION OF PREPARATORY PROCESS OF TANGSHAN EARTHQUAKE ACCORDING TO DIGITAL FILTERING OF THE DATA FOR UNDERGROUND WATER — Research Paper | ScholarLens