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Crustal thickness and poisson’s ratio variations across the northwest Himalaya and eastern Ladakh

100%

Hazarika D. , Kumar N. , Yadav D.

Acta Geophysica

2013

tom Vol. 61, no. 4

905--922

Crustal thickness and PoissonPoisson's ratios are estimated across the northwest (NW) Himalaya and eastern Ladakh applying H-k stacking method on receiver functions of teleseismic earthquakes recorded at 16 broadband seismological stations. The results show significant lateral variation of crustal thickness from the Lesser and Higher Himalaya (~50 km thick) to Ladakh (~80 km thick) through the Indus Tsangpo Suture Zone (ITSZ). The Indian Moho is continuously traceable across the ITSZ which is consistent with the underthrusting of the Indian plate beyond the surface collision boundary. The estimated Poisson's ratio is intermediate in the Tethyan Himalaya (0.269-0.273) and high beneath Ladakh (0.280-0.303), indicating the effect of aqueous fluid/partial melt present in the crust.

Earthquake precursory research in western Himalaya based on the multi-parametric geophysical observatory data

100%

Kumar N. , Rawat G. , Choubey V. , Hazarika D.

Acta Geophysica

2013

tom Vol. 61, no. 4

977--999

The opening of cracks and influx of fluids in the dilatancy zone of impending earthquake is expected to induce short-term changes in physical/ chemical/hydrological properties during earthquake build-up cycle, which should be reflected in time-varying geophysical fields. With this rationale, eleven geophysical parameters are being recorded in continuous mode at the Multi-Parametric Geophysical Observatory (MPGO), in Ghuttu, Garhwal Himalaya, for earthquake precursory research. The critical analysis of various geophysical time series indicates anomalous behavior at few occasions; however, the data is also influenced by many external forces. These external influences are the major deterrent for the isolation of precursory signals. The recent work is focused on the dataadoptive techniques to estimate and eliminate effects of solar-terrestrial and hydrological/environmental factors for delimiting the data to identify short-term precursors. Although any significant earthquake is not reported close to the observatory, some weak precursory signals and coseismic changes have been identified in few parameters related to the occurrence of moderate and strong earthquakes.

Nanotechnology in cancer therapeutics, diagnosis, and management

100%

Hazarika D. , Sarma S. , Shankarishan P.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

2024

tom 105

nr 3