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- Title
Characteristic ULF band magnetic field variations at MPGO, Ghuttu for the 20 June 2011 earthquake in Garhwal Himalaya.
- Authors
Rawat, Gautam
- Abstract
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.
- Publication
Current Science (00113891), 2014, Vol 106, Issue 1, p88
- ISSN
0011-3891
- Publication type
Academic Journal