The Coulomb stress imparted by the mainshocks to the surrounding major active faults are calculated here. Very large stress increases are evident on the Hinagu and Unzen Faults southwest of the mainshocks, and more modest increases are resolved on the Beppu-Haneyama Fault zone to the northeast and Saga-heiya-hokuen Fault to the northwest. All four of these faults are associated with remote aftershocks of the Kumamoto mainshocks, indicating that the probability of large shocks on them has also increased. The city of Kumamoto is located just to the west of the “+4.2”.
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