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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Temporal changes in the distinct scattered wave packets associated with earthquake swarm activity beneath the Moriyoshi-zan volcano, northeastern Japan

Fig. 1

Hypocenter distribution around the Moriyoshi-zan volcano. a Index map. b Areal map of the study area showing shallow seismicity (≤ 15 km) before and after the Tohoku earthquake (blue crosses: January 2006–March 2011; red circles: March 2011–November 2016) from the unified catalog of the Japan Meteorological Agency (JMA). The solid rectangle represents the largest cluster in which hypocenter migration was observed. The broken rectangle represents the area shown in Figs. 2, 8, and 9. Green and orange inverted triangles denote Hi-net and temporary seismic stations, respectively. c Relocated hypocenter distribution in the largest cluster in b. Color of the circles shows the chronological sequential number of earthquakes in the period from March 2011 to November 2016. d Magnitude versus sequential number plot

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