Processes of generation of earthquakes in Burmese-Andaman arc and Himalaya-random or non-random?

摘要

The frequency analysis of inter-event time between successive earthquake events (m_b ≥ 5.0), with variable time bin, exhibits non-Poissonian characters when analysed for two contrasting seismotectonic sectors, viz. Burmese - Andaman Arc and Himalaya of Indian subcontinent. The inter-event time follows Hurst phenomena. The value of Hurst coefficient of the original sequence is placed in-between the maximum and minimum Hurst coefficient values generated by 300 randomized sequences. These randomized sequences are synthetically generated from the original inter-event time sequence by Monte-Carlo simulation method. Statistical 'Z' tests on Hurst coefficient values of the original inter-event time sequence with suitable null-hypotheses and Hurst plots exhibit pronounced non-random nature of earthquake occurrences and thereby reflecting the existence of temporal clustering in the sectors. The self similarity process of earthquake occurrences has pointed towards the critically stable condition of the seismogenic crust in the Indian subcontinent. As the process of earthquake generation is deterministic, prediction of earthquakes by statistical means is also possible.