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Rawat, Gautam
- Characteristic ULF Band Magnetic Field Variations at MPGO, Ghuttu for the 20 June 2011 Earthquake in Garhwal Himalaya
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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
Current Science, Vol 106, No 1 (2014), Pagination: 88-93Abstract
Magnetic field variations recorded at the Multi Parameter Geophysical Observatory (MPGO), Ghuttu, using digital fluxgate magnetometer are studied in the frequency band 0.03-1 Hz and for 19-20 h UT for June 2011. Polarization analysis based on planar wave assumption for far field is applied in order to discriminate seismo-magnetic signatures. The dynamics of earthquake processes, considering them as selforganized critical systems, is also studied using fractal dimension of ultra-low frequency band geomagnetic field variations. Marginal increase in polarization ratio and fractal dimension a few days before the earthquake is significant against the background of global geomagnetic activity. At the same time, the effect of post-seismic readjustment of seismogenic processes is clearly marked by significant changes in fractal dimension and increased polarization ratio after the earthquake.Keywords
Fractals, Polarization Ratio, Seismomagnetic Signatures, ULF Band Geomagnetic Field.- Prominent Precursory Signatures Observed in Soil and Water Radon Data at Multi-Parametric Geophysical Observatory, Ghuttu for Mw 7.8 Nepal Earthquake
Abstract Views :268 |
PDF Views:109
Authors
Naresh Kumar
1,
Vishal Chauhan
1,
S. Dhamodharan
1,
Gautam Rawat
1,
Devajit Hazarika
1,
P. K. R. Gautam
1
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