Seismicity characteristics of the 2011 <Emphasis Type="Italic">M</Emphasis>9.0 Tohoku earthquake near the East Coast of Honshu in Japan |
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Authors: | Yan Xue Jie Liu HuaiZhong Yu ShuangQing Liu |
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Institution: | (1) Council of Scientific & Industrial Research (CSIR), National Geophysical Research Institute, Uppal Road, Hyderabad, 500606, Andhra Pradesh, India |
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Abstract: | The spatiotemporal evolution of the M9.0 Tohoku earthquake sequence off the East Coast of Honshu in Japan on March 11, 2011 and precursive seismic activity near
the Japan Trench show that the earthquake sequence has foreshock-main shock-aftershock characteristics. Its foreshock sequence
is characterized by a concentrated spatial distribution, low b value and the same focal mechanisms. Half an hour after the
main shock, the two greatest aftershocks, with magnitudes of M7.9 and M7.7, occurred, followed by a rapid reduction in the strength of events. The aftershock activity was enhanced roughly two weeks
and one month after the main event. This great earthquake ruptured bilaterally. Five hours after the main shock, the aftershock
zone extended over a range that was 500 km in length and 300 km in width. A day later, the long axis of the aftershock area
had expanded to about 600 km. Nine years prior to the 2011 earthquake, the seismicity in the location of the seismic source
for this event enhanced significantly, with the extent of this area of enhanced seismicity being roughly equivalent to the
aftershock zone. |
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Keywords: | foreshock sequence aftershock activity accelerating moment release (AMR) |
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