Abstract
Seismicity of Jharkhand state resembles to that of Stable Continental Region (SCR) and has experienced nearly 30 earthquakes of magnitudes ranging from 3 to 6 during the last 147 years. These earthquakes are shallow and crustal in nature which are scattered all over the region. However during the last 10 to 15 years there has been increase in the occurrence of seismic events. The study of plot of earthquake energy release versus time indicates that the earthquake of magnitude 6 may occur in and around the year 2060. The probabilistic analysis shows a high probability of occurrence of seismic events with M > 5 in 50 years of time interval and such interval increases with increase of earthquake magnitude. The return period for magnitudes 6 and above is quite high (80 to 100 years) where as for lower magnitudes the probability of occurrence ranges from 7 to 22 years. This periodicity of 100 years for magnitude 6 is approximately matching with the trend of magnitude energy release plot. However in view of the development and upcoming of high rise buildings in the region the smaller events and longer return period of damaging earthquake must not be ignored.
Highlights
The state of Jharkhand is carved out of the erstwhile state of Bihar (India) on 15 November 2000 and extends from 21058’10”N to 25019’15”N Latitude and from 83020’50”E to 8804’40”E Longitude
The region is typically marked by varied type of geomorphic features ( Fig.1) viz.; i) the Vindhayn plateau extending into the Rohtas region ii) the Damodar Valley Coal bearing Gondwana basin iii) Rajmahal belt in east iv) the Satpura range extending into southern central large tract of the state and v) the Chhotanagpur Plateau (CNP) in south which is bounded by the Mahanadi Gondwana basin forming as broad belt and extending linearly south westward to central India, Mahadevan (2002)
In recent past, Jharkhand State has experienced moderate to fairly high seismicity with record of small tremors along the borders of adjoining Indian states viz.; Bihar, Orissa and West Bengal and the area being the hub of the coal mining and allied industries the developments in the region is taking place at faster rate and even this low seismicity is of concern to civil engineers and all aspects should be studied well
Summary
The state of Jharkhand is carved out of the erstwhile state of Bihar (India) on 15 November 2000 and extends from 21058’10”N to 25019’15”N Latitude and from 83020’50”E to 8804’40”E Longitude (with north-south extension of about 380 km and east-west extension of 463 km). No regular pattern of earthquake occurrence has been observed except alignment of few events along the faulted margin of crystalline and sedimentary gondwana basin. In recent past , Jharkhand State has experienced moderate to fairly high seismicity with record of small tremors along the borders of adjoining Indian states viz.; Bihar, Orissa and West Bengal and the area being the hub of the coal mining and allied industries the developments in the region is taking place at faster rate and even this low seismicity is of concern to civil engineers and all aspects should be studied well. In present paper statistical approach of Extreme Value Theory as described by Gumbel (1958) has been carried out to calculate the probability of occurrence of event of certain magnitude using data set for a period 1862 to 2009 down loaded from USGS site and this method has been applied by various workers viz.; Schenkova and Karnik (1970); Karnik and Schenkova (1974); Srivastava et al (1976), Tezcan(1996) in various regions of the world
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