Fractal study of seismicity in order to characterize the various tectonic blocks of North-east Himalaya, India

North-eastern Himalaya is said to be one of the world most complex geological set-up with different kinds of seismotectonic systems. Region has experienced two of the world’s strongest earthquakes, such as Shillong earthquake of 1897 known as Assam earthquake and subsequent 1950 earthquake in Arunac...

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Bibliographic Details
Published in:Natural hazards (Dordrecht) 2015-05, Vol.77 (Suppl 1), p.5-18
Main Authors: Roy, P. N. S., Chowdhury, Suparna, Sarkar, Partha, Mondal, Saroj Kumar
Format: Article
Language:English
Subjects:
Civil Engineering
Earth and Environmental Science
Earth Sciences
Earthquakes
Environmental Management
Fractals
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Natural Hazards
Original Paper
Plate tectonics
Seismic activity
Seismic hazard
Seismology
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Summary:North-eastern Himalaya is said to be one of the world most complex geological set-up with different kinds of seismotectonic systems. Region has experienced two of the world’s strongest earthquakes, such as Shillong earthquake of 1897 known as Assam earthquake and subsequent 1950 earthquake in Arunachal Pradesh, both of with magnitude of 8.7, and also several other strong earthquakes. Various techniques have been applied to understand the past strong earthquake mechanism as well as hazard estimation carried out for future earthquake. Fractal correlation dimension ( D c ) is being used in this study with the seismicity for the period 1961 to recent for understanding the pattern of seismic hazard. The entire area has been divided into four major tectonic blocks, and each block event was divided into consecutive fifty events window for seeing spatiotemporal patterns. After comparing the patterns, we have identified that Block of Eastern Himalaya near Main Central Thrust, Main Boundary Thrust, north of Kopili lineament and Block of Shillong plateau near Dauki fault are having relatively intense clustering of events in recent times, which may be identified as the zones of most potential to have a strong event.
ISSN:0921-030X
1573-0840
DOI:10.1007/s11069-014-1188-2