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Gupta, Vikram
- Influence of Magnetic Fabric Anisotropy on Seismic Wave Velocity in Paramagnetic Granites from NW Himalaya: Results from Preliminary Investigations
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 4 (2010), Pagination: 322-330Abstract
Anisotropy of Magnetic Susceptibility (AMS) and seismic wave velocity studies of some paramagnetic Himalayan granitoids show good correlation between magnetic fabric anisotropy and P wave velocity (Vp). Vp shows strong positive correlation with magnetic lineation (L) and degree of magnetic anisotropy (P') having correlation coefficient (r) values of 0.93 and 0.89 respectively. Both Vp and Vs show positive correlation with the SiO2 content of Proterozoic and Paleozoic granitoids. Velocity of S wave (Vs) shows negative correlation with mean magnetic susceptibility (Km) having 'r' value of 0.86. The correlation between Vs-Km, Vp-P', Vp-L also shows >95% probability in Spearman's rank correlation. Based on the results from the present sample size it is suggested that, in paramagnetic granites, Vp is proportional to intensity of deformation and preferred orientation of minerals as well as the mineralogy. On the other hand, Vs is more dependent on the mineralogy alone.Keywords
Paramagnetic Granites, AMS, Primary Wave, Secondary Wave, Deformation, XRF, NW Himalaya.
- Spatial Distribution pf Landslides Vis-à-Vis Epicentral Distribution of Earthquakes in The Vicinity of The Main Central Thrust Zone, Uttarakhand Himalaya, India
Abstract Views :151 |
PDF Views:77
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 12 (2021), Pagination: 1927-1932Abstract
Landslides and related mass movement activities along with earthquakes are common in the Himalayan terrain. The distribution of seismic activities in the vicinity of the Main Central Thrust (MCT) is well known. However, in order to assess the relationship between these seismic events and landslides, the spatial distribution of landslides and earthquake events (magnitude >1.5) on either side of the MCT zone was evaluated. It has been observed that seismic events of magnitude <2.1 are clustered around the 1991 Uttarkashi earthquake rupture, 1999 Chamoli earthquake rupture and around Munsiyari. The zone surrounding 1999 Chamoli earthquake rupture indicates the highest earthquake and landslide density of ∼75% and 53% respectively.Keywords
No Keywords.Full Text
References
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