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《Chinese Journal of Geophysics》 1980-04
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PRELIMINARY STUDY OF THE RELATION BETWEEN A KIND OF PRESSURE WAVES IN THE ATMOSPHERE AND EARTHQUAKES

Hu XIN-KANG SHI JIN-RUI KEN JIAN-GUO(Institute of Acoustics, Academia Sinica)  
An observational result of the relation between a kind of pressure waves in the atmosphere and local earthquakes is reported.The period of the pressure waves is between tens and 500 seconds; its amplitude is between 5 and 100 Pa; the dominant period of the waves changes very little. The waves occur in groups each consisting of 3-15 waves. The identification of the waves is easy, because their waveform is smooth. The order of magnitude of horizontal phase speed for these waves is 10 m/s, and the waves are transverse.For the local earthquakes studied in this report, about 70% of them are preceded by such low frequency pressure waves within 30 hours before the earthquake event.
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