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Title: Seismicity patterns earthquake source mechanism and seismic hazard in north east India
Researcher: Das, Tilaka
Guide(s): Sarmah, S K
Keywords: Cluster
University: Gauhati University
Completed Date: 31/12/1995
Abstract: In this research, studies related to seismicity patterns, earthquake source mechanism and seismic hazards of north-east Indian region have been made by using the available earthquake data and the geotectonic features of the region. History of earthquakes of north-east India reveals that the region is seismically very active. During the last one hundred years, four major earthquakes such as the great Indian earthquake of 1897 (M = 8.7), Dhubri earthquake of 1930 (M = 7.0), the Assam earthquake of 1950 (M = 8.6) and the Indo-burma earthquake of 1988 (M = 7.0) occurred in this region. Earthquake data for the last forty years shows that number of small magnitude earthquakes are increasing whereas that for large magnitude earthquakes are decreasing. The data for this study has been taken from the data file of U.S. coast and Geodatic survey, Bulletin of the International Seismological Centre, Local seismic networks of Regional Research Laboratory, Jorhat and Gauhati University seismic network. Based on geology and tectonics, the study area has been divided into two tectonic blocks such as I and II by a line more or less parallel to the Kopili lineament. The great Indian earthquake of 1897 occured in block I whereas the Assam earthquake of 1950 occured in block II. In this research, a general patterns of seismicity has been studied with the help of epicentral map of both macro and micro earthquakes, the space-time plots of earthquakes and the earthquake depth distribution profiles. From the epicentral map of macro earthquakes the patterns like aseismic areas or gaps, doughnut patterns and reverse doughnut patterns have been observed. But the significant of reverse doughnut pattern is not known. From the epicentral map of micro earthquake from local network data, three clusters of earthquake epicentres have been found and named as Shillong plateau cluster, Assam - Arunachal Pradesh cluster and Manipur - Burma cluster. In this research, some properties of cluster have been discussed by evaluating (1) spatio-temporal...
Appears in Departments:Department of Environmental Science

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01_title page.pdfAttached File20.98 kBAdobe PDFView/Open
02_certificate.pdf23.28 kBAdobe PDFView/Open
03_acknowledgement.pdf24.05 kBAdobe PDFView/Open
04_abstract.pdf92.04 kBAdobe PDFView/Open
05_content.pdf39.28 kBAdobe PDFView/Open
06_list of tables.pdf29.5 kBAdobe PDFView/Open
07_list of figures.pdf123.36 kBAdobe PDFView/Open
08_chapter 1.pdf119.92 kBAdobe PDFView/Open
09_chapter 2.pdf172.33 kBAdobe PDFView/Open
10_chapter 3.pdf500.62 kBAdobe PDFView/Open
11_chapter 4.pdf296.1 kBAdobe PDFView/Open
12_chapter 5.pdf2.31 MBAdobe PDFView/Open
13_chapter 6.pdf1.21 MBAdobe PDFView/Open
14_chapter 7.pdf982.89 kBAdobe PDFView/Open
15_conclusion.pdf70.71 kBAdobe PDFView/Open
16_bibliography.pdf457.63 kBAdobe PDFView/Open
17_appendix i.pdf1.19 MBAdobe PDFView/Open
18_appendix ii.pdf2.72 MBAdobe PDFView/Open

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