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Journal: |
Earthquake Science 2012 No.3
clicks:802 |
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Title:
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Author:
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Farah Lazzali |
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Adress: |
University M’Hamed Bougara of Boumerdes, Boumerdes 35000, Algeria |
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Abstract:
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The Tohoku megathrust earthquake,
which occurred on March 11, 2011 and had an epicenter that was 70 km east of
Tohoku, Japan, resulted in an estimated ten′s of billions of dollars in damage
and a death toll of more than 15 thousand lives, yet few studies have documented
key spatio-temporal seismogenic characteristics. Specifically, the temporal
decay of aftershock activity, the number of strong aftershocks (with magnitudes
greater than or equal to 7.0), the magnitude of the greatest aftershock, and
area of possible aftershocks. Forecasted results from this study are based on
Gutenberg-Richter’s relation, Bath’s law, Omori’s law, and Well’s relation of
rupture scale utilizing the magnitude and statistical parameters of earthquakes
in USA and China (Landers, Northridge, Hector Mine, San Simeon and Wenchuan
earthquakes). The number of strong aftershocks, the parameters of
Gutenberg-Richter’s relation, and the modified form of Omori’s law are confirmed
based on the aftershock sequence data from the Mw9.0 Tohoku earthquake.
Moreover, for a large earthquake, the seismogenic structure could be a fault, a
fault system, or an intersection of several faults. The seismogenic structure of
the earthquake suggests that the event occurred on a thrust fault near the Japan
trench within the overriding plate that subsequently triggered three or more
active faults producing large aftershocks. |
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Comment: |
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