Brothelande E, Amelung F, Yunjun Z, Wdowinski S
Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL, 33149, USA.
Department of Earth and Environment, Florida International University, Miami, Florida, USA.
Sci Rep. 2018 Jun 28;8(1):9811. doi: 10.1038/s41598-018-28026-4.
It is not known whether clustered or aligned volcanic edifices at the Earth surface have connected magmatic systems at depth. Previously suggested by geological records of paired eruptions, volcano interconnectivity still lacks proper geodetic evidence. Here we use GPS time-series and deformation modeling to show how Aira caldera and Kirishima, two adjacent volcanic centers in Kagoshima graben (southern Japan), interacted during Kirishima unrest in 2011. Whereas Aira caldera had been inflating steadily for two decades, it deflated during the eruption of Kirishima which started with a large-volume lava extrusion. This deflation, which cannot be explained by stress changes, is interpreted as the result of magma withdrawal from the Aira system during the Kirishima replenishment phase. This study highlights the behavior of connected neighboring volcanic systems before and after a large eruption, and the importance of taking into account volcano interactions in eruption probability models.
目前尚不清楚地球表面成群或排列的火山结构体在深部是否具有相连的岩浆系统。尽管以前成对喷发的地质记录曾暗示火山之间存在连通性，但仍然缺乏合适的大地测量证据。在此，我们利用GPS时间序列和形变建模来展示2011年雾岛火山活动期间，日本南部鹿儿岛地堑中两个相邻的火山中心——阿伊拉火山口和雾岛是如何相互作用的。在长达二十年的时间里，阿伊拉火山口一直在稳定膨胀，但在雾岛火山开始大规模熔岩喷发时，它却出现了收缩。这种收缩无法用应力变化来解释，被解释为在雾岛火山岩浆补给阶段，阿伊拉火山系统的岩浆被抽出的结果。这项研究突出了大型火山喷发前后相邻火山系统的连通行为，以及在喷发概率模型中考虑火山相互作用的重要性。
