Seismic intensity map of South India for estimated future earthquakes
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ORIGINAL PAPER
Seismic intensity map of South India for estimated future earthquakes Panjamani Anbazhagan & Sayed S. R. Moustafa & Nassir S. N. Al-Arifi
Received: 20 August 2014 / Accepted: 24 February 2015 # Saudi Society for Geosciences 2015
Abstract In this study, an attempt has been made to prepare the seismic intensity map for south India considering the probable earthquakes in the region. Anbazhagan et al. (Nat Hazards 60:1325–1345, 2012) have identified eight probable future earthquake zones in south India based on rupture-based seismic hazard analysis. Anbazhagan et al. (Eng Geol 171:81– 95, 2014) has estimated the maximum future earthquake magnitude at these eight zones using regional rupture character. In this study, the whole south India is divided into several grids of size 1o ×1o and the intensity at each grid point is calculated using the regional intensity model for the maximum earthquake magnitude at each of the eight zones. The intensity due to earthquakes at these zones is mapped and thus eight seismic intensity maps are prepared. The final seismic intensity map of south India is obtained by considering the maximum intensity at each grid point due to the estimated earthquakes. By looking at the seismic intensity map, one can expect slight to heavy damage due to the probable earthquake magnitudes. Heavy damage may happen close to the probable earthquake zones. Keywords Earthquake . Probable earthquake zone . Intensity . South India P. Anbazhagan (*) Indian Institute of Science, Bangalore, Karnataka, India e-mail: [email protected] P. Anbazhagan e-mail: [email protected] P. Anbazhagan : S. S. R. Moustafa : N. S. N. Al-Arifi Geology and Geophysics Department, Faculty of Science, King Saud University, Riyadh 11451, Saudi Arabia S. S. R. Moustafa Seismology Department, National Research Institute of Astronomy and Geophysics (NRIAG), Cairo 11421, Egypt
Introduction Indian cities face threats from a variety of natural hazards, among which damages and loss of lives caused by the earthquake and related hazards are predominant, even though it occurs infrequently. Seismic hazard values are the essential components of earthquake resistant design and disaster management. The results of earthquake hazard analysis are useful to estimate the site effects of liquefaction, landslide, and tsunami for microzonation of city, which can be further useful for urban planning and disaster management. Macro level and micro level hazard parameters are estimated and mapped. Macro level hazard values are given in the seismic codal provision of India based on observed seismicity. The spate of earthquakes in the recent past which have caused extensive damage has heightened the sensitivity of administrators, engineers, and general public to the looming hazard due to future earthquakes which might occur near densely populated cities worldwide, particularly in India. Major earthquakes are rare events in south India, but moderate earthquakes can be expected in this region (Anbazhagan et al. 2014). The increas
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