Helium/radon precursory signals of Chamoli Earthquake, India
2001; Elsevier BV; Volume: 34; Issue: 1-6 Linguagem: Inglês
10.1016/s1350-4487(01)00190-1
ISSN1879-0925
Autores Tópico(s)Seismology and Earthquake Studies
ResumoThe Bhagirthi and Alaknanda valleys of Garhwal Himalaya, were rocked, respectively, by two major earthquakes: the Uttarkashi earthquake of magnitude mb=6.5, Ms=7.0 on October 20, 1991 and the Chamoli earthquake of mb=6.8, Ms=6.5 on March 29, 1999, during this decade. Both these seismic events are associated with ongoing deformation along the main central thrust of the Himalayas. Helium and radon anomalies on March 24 and March 27, 1999, respectively, were recorded at Palampur which is about 393km from the Chamoli earthquake epicentre. A He/Rn ratio anomaly was recorded on March 20, 9 days before the Chamoli earthquake. The precursory nature of radon and helium anomalies is a strong indicator of the physical basis of earthquake prediction and a preliminary test for the proposed conceptual He/Rn ratio model.
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