Soil-gas radon/helium surveys in some neotectonic areas of NW Himalayan foothills, India
Sandeep Mahajan,Vivek Walia,Bikramjit Singh Bajwa,Ashwani Kumar,S. Singh,N. Seth,Sunil Dhar,G. S. Gill,Tsanyao Frank Yang,Tsanyao Frank Yang +9 more
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In this article, the relationship between variation in the soil gases radon (222Rn) and helium (4He) and recently developed fissures and other neotectonic features in Nurpur and Nadha areas of the NW Himalayas, India.Abstract:
. The present research is aimed at accessing the relationship between variation in the soil gases radon (222Rn) and helium (4He) and recently developed fissures and other neotectonic features in Nurpur and Nadha areas of the NW Himalayas, India. Two soil-gas surveys were conducted on/near known faults to reconfirm their position using soil gas technique and to check their present activity. During these surveys, soil-gas samples were collected along traverses crossing the observed structures. The data analysis reveals that the concentrations of radon and helium along the Dehar lineament and the longitudinal profile (Profile D) are very high compared to any other thrust/lineament of the Nurpur area. The Nadha area shows high values of radon and helium concentrations along/near the Himalayan Frontal Fault (HFF) as compared to the adjoining areas. This indicates the presence of some buried fault/fault zone running parallel to the HFF, not exposed to the surface and not delineated by satellite data but is geochemically active and might be tectonically active too. Hence, soil helium and radon gas patterns have been combined with morphological and geological observations to supply useful constraints for deformation of tectonic environments.read more
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A review on out-of-sequence deformation in the Himalaya
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References
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TL;DR: In this article, the main sources, behaviours and uses of species detected in soils and springs are displayed, and their mode of sampling and analysing briefly described, and the main patterns of degassing in soils are described and a wide range of geochemical signatures as the result of both permeability and mineralogical contrasts.
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Apparent Himalayan slip deficit from the summation of seismic moments for Himalayan earthquakes, 1500-2000
Roger Bilham,N. N. Ambraseys +1 more
TL;DR: In this article, a measure of the convergence rate between India and Tibet for the past five centuries has been used to estimate the magnitudes of Himalayan earthquakes since 1500, and the calculated rate ( 85 earthquakes, events that are unlikely to have escaped note in the historical written record.
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Variations of soil radon and thoron concentrations in a fault zone and prospective earthquakes in SW Taiwan
Tsanyao Frank Yang,Tsanyao Frank Yang,Vivek Walia,L. L. Chyi,Ching-Chou Fu,C.-H. Chen,Tsung-Kwei Liu,Sheng-Rong Song,C.Y. Lee,Ming-Yih Lee +9 more
TL;DR: In this article, an automatic station for soil gas monitoring was set up on an active fault zone of SW Taiwan, and some spike-like anomalous high radon and thoron concentrations could be observed.