Significant anomalies of helium, radon and gamma ahead of 7.9 M China earthquake

Das, N. and Bhandari, R. and Ghose, D. and Sen, P. and Sinha, B. (2009) Significant anomalies of helium, radon and gamma ahead of 7.9 M China earthquake. Acta Geodaetica et Geophysica Hungarica, 44 (3). pp. 357-365. ISSN 1217-8977

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Abstract

Strong anomalies in the concentration of helium, radon and gamma were observed in gases at the geochemical monitoring station, Bakreswar, West Bengal, India, about two weeks before the 7.9 M earthquake at Sichuan, China. The distance between the epicenter of the earthquake and the monitoring site is about 1800 km. This long distance preseismic observation indicates that the radius of influence of large magnitude earthquakes may be substantially large and may cut across plate boundaries. This paper presents the observed geochemical anomalies for the Sichuan earthquake and discusses empirical postulates between earthquake magnitude and its radius of influence.

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