Fig. 10
From: A review of shallow slow earthquakes along the Nankai Trough
Regional differences in shallow VLFE swarms in Nankai. We modified Fig. 4 of Takemura et al. (2022b). Blue circles, purple triangles, and red diamonds are the resultant values in regions southeast off the Kii Peninsula, south off the Kii Peninsula, and off Cape Muroto, respectively. The light blue square represents a shallow VLFE swarm that started on September 6, 2004, which can be considered a triggered VLFE swarm owing to the Mw 7.4 intraslab earthquake. Cumulative moments versus a swarm activity areas, b swarm durations, and c apparent spreading speeds. We added d apparent spreading speeds versus swarm durations. The apparent spreading speed was evaluated by dividing the along-strike distance by the duration of each shallow VLFE swarm. The data of shallow VLFE swarms can be downloaded from https://doi.org/10.5281/zenodo.5824418