on the possibility of the 2011 tohoku-oki earthquake reactivating shinmoe-dake volcano, southwest japan: insights from strain data measured in vaults
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ID: 174886
2011
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Abstract
The Shinmoe-dake volcano in southwest Japan, which produced its first major eruption in 52 yr on 26 January 2011 but had been quiescent since 1 March, re-erupted on 13 March. It was only two days after the occurrence of the <i>M</i> = 9.0 Tohoku-oki earthquake in eastern Japan. The coincidence of the two events raises the question of whether the earthquake triggered the volcanic activity. As a provisional but rapid assessment of this question, we examined high-resolution strain data at a site located 18 km from Shinmoe-dake. In terms of the Tohoku-oki earthquake, three points can be drawn from the strain data: (1) static strain changes were less than 0.05 × 10<sup>−6</sup>, which is too small to trigger an eruption; (2) the amplitudes of dynamic strain changes are on the order of 10<sup>−6</sup>, which may trigger seismicity or volcanic eruption; and (3) strain rates were not accelerated, which indicates no significant change in magma pressure. Comparing these results with reports of other eruptions coincident with seismic events, and considering a scenario in which a seismic event triggered an eruption, we tentatively conclude that the eruption on 13 March was not a triggered event. However, this conclusion may be revised after analyzing seismic data.
| Reference Key |
yamazaki2011naturalon
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| Authors | ;K. Yamazaki;M. Teraishi;S. Komatsu;Y. Sonoda;Y. Kano |
| Journal | anziam journal |
| Year | 2011 |
| DOI |
10.5194/nhess-11-2655-2011
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