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Fig. 10 | Earth, Planets and Space

Fig. 10

From: InSAR analysis for detecting the route of hydrothermal fluid to the surface during the 2015 phreatic eruption of Hakone Volcano, Japan

Fig. 10

Conceptual diagram of the 2015 volcanic activity of Hakone Volcano inferred from the data modeling of InSAR images. a The reservoir of hydrothermal fluid (elevation of about 225 m) and the crack (elevation of 530–830 m) originally existed before the earthquake swarm.b Temperature and pressure possibly rose in the reservoir of hydrothermal fluid during the swarm activity, and an increase in pressure possibly occurred in the hydrothermal network. A small quantity of water or steam was uplifted to the ground surface and caused the very local swelling and the abnormal blowouts of steam wells. c When a path between the reservoir and crack formed, the hydrothermal fluid intruded from the reservoir to the crack. The released pressure in the hydrothermal system caused inflation of a very shallow source located the northernmost part of the crack and resulted in the phreatic eruption

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