Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Lukman A. Sunmonu ¹, V. P. Dimri ²

Affiliations
1 Department of Pure and Applied Physics, Ladoke Akintola University of Technology, P.M.B. 4000, Ogbomoso, NG
2 Fractals in Geophysics Group, National Geophysical Research Institute, Hyderabad - 500 007, IN

Abstract

Northeast India experienced compressive forces from the Himalayan Arc in the north and the Burmese Arc in the east, which led to the development of a number of seismogenic faults, fractures and lineaments. It is observed that the characteristics of earthquakes occurring on an active fault are closely related to the irregularity of fault geometry. Because of their rough appearances over many length scales, faults can be conveniently regarded a. fractal sets, and their georretrical irregularity can be quantified using fractal dimension. We have calculated fractal dimension of the distribution of faults in two tectonic blocks, Bengal basin and Tripura fold belt, in the northeast India. We found that in the spatial sense the fractal dimension and the seismicity are positively correlated.

Keywords

Earthquake, Seismicity, Fractal Dimension, Faults, Tripura, Bengal Basin, Ne India.

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Lukman A. Sunmonu ¹, V. P. Dimri ¹, M. Ravi Prakash ², Abhey Ram Bansal ²

Affiliations
1 Department of Pure & Applied Physics, Ladoke Akintola University of Technology, P.M.B. 4000 Ogbomoso Oyo State, NG
2 Fractals in Geophysics Group, National Geophysical Research Institute, Hyderabad - 500 007, IN

Abstract

We presented time series analysis of multifractal properties of M≥7.0 earthquakes in Himalaya and vicinity during the period 1895-1995. The multifractal analysis of complex phenomena involves the estimation and interpretation of D_q-q relation. Our investigations show that: (1) the distribution of earthquakes of M≥7.0 on the time axis has a multifractal set, (2) well distributed, steep type decreasing function of D_q with increasing q, indicates high rates of accumulation and release; therefore, leading to adjustment of a large scale stress field in the area, and (3) value of D₂ = 0.95 > D₂ > D_∞ = 0.80.

Keywords

Multifractal, Time Series, Earthquake, Himalaya.

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