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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Overpressurized fluids drive microseismic swarm activity around Mt. Ontake volcano, Japan

Fig. 1

Topographic map of Mt. Ontake volcano, seismic stations, and 379 focal mechanisms with M ≥ 1. Focal mechanism solutions are represented by the lower-hemisphere projection of focal spheres, and the color scale corresponds to focal depth. The dashed rectangle in red represents the model region in the present FMT analysis. The red triangle indicates Mt. Ontake. The solid circles and squares mark temporary and permanent seismic stations, respectively. The light gray, dark gray, and black symbols denote seismic stations organized by Nagoya University, national institutes (the Japan Meteorological Agency and NIED), and Gifu and Nagano prefectures, respectively. The white star and the blue rectangle denote the epicenter and the source region of the 1984 Western Nagano prefecture earthquake. The brown lines indicate active faults. The dashed black line marks the prefectural boundary between Gifu and Nagano prefectures. The red rectangle denotes the events that were triggered between June and September, 2011

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