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JDR Vol.17 No.5 pp. 829-838
(2022)
doi: 10.20965/jdr.2022.p0829

Paper:

Impact on the Electric Infrastructure Due to Volcanic Ash from a Hydrovolcanic Eruption of Aso Volcano in 2016

Masashi Nagai and Setsuya Nakada

National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

Corresponding author

Received:
January 14, 2022
Accepted:
June 8, 2022
Published:
August 1, 2022
Keywords:
hydrovolcanic eruption, ash attachment on insulators, major power outage, ash enriched in volcanic fluid, Kumamoto Earthquake
Abstract

A hydrovolcanic eruption in the early hours of October 8, 2016 triggered a power outage of about 29,000 houses (∼50,000 habitants) in the Aso caldera area, Kyushu, Japan. Although it was recovered naturally by the early morning of that day, the power outage occurred again in the evening following rainfall that began in the afternoon. The power supply in the caldera area had been temporarily maintained despite the heavy landslide damage due to strong earthquakes in April 2016, without the supplemental transmission lines for the normal standard. The power outage is considered to have been due to the insulator flashover in the power substation, Ichinomiya, Aso, around which the mass of volcanic ash was about 3,000 g/m2 or less (≤3 mm thick). This outage resulted from high electric conductivity of the volcanic ash that was wetted with strongly acidic water dammed in the crater before the eruption. This may be one example of the power outage incident due to thin ash fall.

Cite this article as:
M. Nagai and S. Nakada, “Impact on the Electric Infrastructure Due to Volcanic Ash from a Hydrovolcanic Eruption of Aso Volcano in 2016,” J. Disaster Res., Vol.17, No.5, pp. 829-838, 2022.
Data files:
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Last updated on Aug. 05, 2022