Abnormal discharge of high-temperature hot spring water observed at the abandoned well in the Okuhida hot spring area during the earthquakes occurred around Yakedake volcano

Abstract

Earthquakes around Yakedake volcano have increased since late April 2020, and abnormal discharge of high-temperature hot spring water was observed at the abandoned well in the Okuhida hot spring area. As the Okuhida hot spring area is located near the Yakedake volcano, the major chemical and stable isotopic compositions of hydrogen and oxygen of the discharged water were analyzed to investigate the relationship between this abnormal discharge and the volcanic activity of the Yakedake volcano. As a result, no relationship was found between this abnormal discharge and the volcanic activity of the Yakedake volcano.