Fig. 5
From: Migration of earthquakes with a small stress drop in the Tanzawa Mountains, Japan
Relocated and original hypocenters of the cluster activity. a Hypocenters of earthquakes with M ≥ 2.0 relocated by the double-difference relocation method following Yukutake et al. (2012). Color shows the elapsed time from the first earthquake (M4.9) of the cluster activity at 22:39 UT on January 27, 2012. Focal mechanisms of four earthquakes are also shown with the lower hemisphere projection. Two lines indicate cross sections in (b) and (c). Cross section of hypocenters for (b) line AA’ with the strike of N135° E and (c) line BB’ with the strike of N45° E shown in (a). The cluster activity took place on a south-east dipping plane, which is consistent with a nodal plane of the largest earthquake. d Original hypocenters determined by JMA. Cross section of hypocenters for (e) line AA’ and (f) line BB’ shown in (d). Note that earthquakes with M greater than or equal to 2.0 are plotted