Strange attractor in earthquake swarms near Valsad (Gujarat), India

Authors

  • H. N. SRIVASTAVA 128, Pocket - A, Sarita Vihar, New Delhi, India
  • S. N. BHATTACHARYA Indian Institute of Technology, Kharagpur, India
  • D. T. RAO Indian Institute of Technology, Kharagpur, India
  • S. SRIVASTAVA Gujarat Engineering Research Institute, Vadodara, Gujarat, India

DOI:

https://doi.org/10.54302/mausam.v58i4.1439

Keywords:

Chaos, Earthquake swarm, Strange attractor, Earthquake predictability

Abstract

Valsad district in south Gujarat near the western coast of the peninsular India experienced earthquake swarms since early February 1986.  Seismic monitoring through a network of micro earthquake seismographs showed a well concentrated seismic activity over an area of 7 × 10 km2 with the depth of foci extending from 1 to 15 km.  A total number of 21,830 earthquakes were recorded during March 1986 to June 1988.  The daily frequency of earthquakes for this period was utilized to examine deterministic chaos through evaluation of dimension of strange attractor and Lyapunov exponent.  The low dimension of 2.1 for the strange attractor and positive value of the largest Lyapunov exponent suggest chaotic dynamics in Valsad earthquake swarms with at least 3 parameters for earthquake predictability.  The results indicate differences in the characteristics of deterministic chaos in intraplate and interplate regions of India.

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Published

01-10-2007

How to Cite

[1]
H. N. . SRIVASTAVA, S. N. . BHATTACHARYA, D. T. . RAO, and S. . SRIVASTAVA, “Strange attractor in earthquake swarms near Valsad (Gujarat), India”, MAUSAM, vol. 58, no. 4, pp. 543–550, Oct. 2007.

Issue

Vol. 58 No. 4 (2007): MAUSAM

Section

Research Papers

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