Analysis of volcanic ash from Mt. Asama eruption August 9, 15:37, unlikely to develop into a large-scale eruption

Experts analyzed the volcanic ash that fell during the eruption of Mt. Asama on the 7th, and found that no substances related to the new magma were found. Experts say that it is unlikely to develop into a large eruption at the moment, but continue to be aware of volcanic activity.

On the night of the 7th, a small eruption occurred at the summit crater of Mt. Asama. Volcanic ash was confirmed in Gunma Prefecture on the northeast side.

A group of Teruo Oikawa, senior researcher at the National Institute of Advanced Industrial Science and Technology (AIST), visited a tourist facility in Tsumagoi Village, 4 kilometers away from the crater, collected volcanic ash, and examined it in detail using a microscope.

As a result, so far, almost all of the volcanic ash is debris of old rocks located in the shallow area near the crater, and no material related to new magma deep underground has been found.

Due to the fact that no remarkable crustal deformation has been observed at Mt. Asama, Dr. Oikawa said that this eruption was not caused by the rise of new magma, but could develop into a large-scale eruption so far Is low.

However, this time a small eruption has occurred without any signs, and it is necessary to keep an eye on volcanic activity.

Asama volcano eruption alert level is 3, and the Japan Meteorological Agency has called for warnings of large cinders and pyroclastic flows associated with eruptions approximately 4 km from the crater.