Macroseismic survey and isoseismal map of September 2011 Sikkim earthquake

Abstract

18 flracj 2011 dks Hkkjrh; ekud le; ds vuqlkj 18:11 ij xaxVksd] flfDde ¼v{kkal&27-7º m-] ns’kkarj 88-2º iw-½ ds 68 fd- eh- mRrj if’pe esa tehu ds uhps 50-0 fd- eh- ls vf/kd dh xgjkbZ esa 6-8 ifjek.k dk Hkwdai vk;kA  iz’ukoyh ds ek/;e ls Hkwdai dh rhozrk ds ckjs esa fd, x, losZ{k.k rFkk izsl fjiksVksZ dk bLrseky leHkwdaih; ekufp= rS;kj djus ds fy, fd;k x;k vkSj dk;Z ds fy, ArcGIS ds Hkwlk¡f[;dh; fo’ys"k.k dh lgk;rk yh xbZ gS bl {ks= ds fy, losZ dh xbZ rhozrk ¼SI ,l- vkbZ-½ vk¡dM+k vkSj pje HkwRoj.k ¼ih-th-,-½ ds chp laca/k fodflr fd;k x;k gS

 An earthquake of M: 6.8 occurred inland at 1811 hrs (IST) on 18 September, 2011, about 68 km northwest of Gangtok, Sikkim (Latitude 27.7 º N, Longitude 88.2º E) at a deeper depth of more than 50.0 km. Intensity survey conducted through a questionnaire and press reports were used for generation of isoseismal map using geo-statistical analysis tool of ArcGIS. Relationship between Surveyed Intensity (SI) data and Peak Ground Acceleration (PGA) was developed for the region.