Studies from Y. Ogata et al add new findings in the area of planetary science

"The November 2006 great thrust earthquake of moment magnitude (M-w) 8.3 on the plate boundary in the Kuril (Chishima) Islands triggered as many vigorous normal-faulting aftershocks in the outer rise region seaward of the trench as on-fault aftershocks. Here we show that the aftershocks for a 40 day period preceding the January 2007 M-w = 8.1 event in the outer rise were less frequently observed than the rate expected by both the Omori-Utsu formula and the epidemic-type aftershock sequence (ETAS) model while at the same time were more frequent along the plate boundary," researchers in Tokyo, Japan report.

"We discuss whether such simultaneous quiescence and activation...

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