Statistical parameters of Bhuj earthquake sequence of January 26th, 2001 |
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Authors: | M A Shaik Sanjay Srivastava |
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Institution: | (1) Seismology Unit, Engineering Geology Division, Gujarat Engineering Research Institute, Race Course, 390 007 Vadodara |
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Abstract: | An intraplate earthquake of magnitude (M
c) 6.9 (Anon 2001a) struck Bhuj and the adjoining region of Kachchh in Gujarat on January 26th, 2001 at about 0316 hrs (GMT)
and was followed by a number of aftershocks. The epicentre of this earthquake was located at 23.4‡N and 70.28‡E close to the
Kachchh mainland fault. The intensity observed around the epicenter was X on the MSK scale. A study of 531 aftershocks, in
the magnitude range of 3.0–5.7, recorded at Vadodara Seismological Observatory till March 31st, 2001 has been carried out
and various statistical parameters calculated. The total energy released during the study period is calculated to be 8.2 ×
1014 joule. Sudden occurrence of the main shock without any foreshock in the same tectonic system is a unique feature of this
sequence. Theb- value (0.86), value of M0-M1 (1.2), high M1/M0 (0.89) and high value of the decay constanth (0.91), all support the tectonic origin of the present study. |
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Keywords: | Foreshock aftershock b-value decay constant energy tectonic stress |
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