Megaearthquake of March 11, 2011, in Japan: The event magnitude and the character of the aftershock sequence |
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| Authors: | M V Rodkin I N Tikhonov |
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| Institution: | 1.International Institute of Earthquake Prediction Theory and Mathematical Geophysics,Russian Academy of Sciences,Moscow,Russia;2.Institute of Marine Geology and Geophysics, Far East Branch,Russian Academy of Sciences,Yuzhno-Sakhalinsk,Russia |
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| Abstract: | The great Japanese earthquake (GJE) of March 11, 2011, was a megaevent. The conditions under which such seismic catastrophes
occurred are discussed. The regime of the aftershocks of this megaevent is compared with the data on the aftershock sequences
which accompanied the Simushir earthquakes (2006 and 2007) and the Andaman earthquake (2004) and with the seismicity behavior
in the generalized vicinity of a strong earthquake. The aftershock sequences of the abovementioned strong earthquakes are
shown to represent the sets of trend changes in the postshock activity and specific outbursts of seismic activity. Activity
outbursts are characterized not only by an increase in the number and energy of events, but also by a decrease in the recurrence
plot slope (b value) and the average earthquake depth. Some such outbursts correspond to the occurrence of strong repeated shocks. A possible
mechanism for outbursts of seismic activity is proposed. The possibility of a stronger repeated shock in the vicinity of the
megaearthquake of March 11, 2011, is discussed. |
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