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Interpretation of detections of volcanic activity at Ioto Island obtained from in situ seismometers and remote hydrophones of the International Monitoring System.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-12-20 , DOI: 10.1038/s41598-019-55918-w Hiroyuki Matsumoto 1, 2 , Mario Zampolli 2 , Georgios Haralabus 2 , Jerry Stanley 2 , James Mattila 2 , Nurcan Meral Özel 2
Scientific Reports ( IF 3.8 ) Pub Date : 2019-12-20 , DOI: 10.1038/s41598-019-55918-w Hiroyuki Matsumoto 1, 2 , Mario Zampolli 2 , Georgios Haralabus 2 , Jerry Stanley 2 , James Mattila 2 , Nurcan Meral Özel 2
Affiliation
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In-situ seismic observations identified that volcanic activity of Ioto (formerly Iwojima), a volcanic island offshore Japan, increased in early September 2018. Observations of discolored nearshore waters and a splash reported by a local flyover provided evidence for a connection between undersea eruptions and recorded seismic activity. However there remain uncertainties as to when the undersea eruption series commenced and how much of the in-situ seismic activity recorded on the island was associated with volcanic earthquakes versus undersea eruptions. During this period, a large number of underwater acoustic (hydroacoustic) signals were recorded by the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydroacoustic station HA11, at Wake Island (U.S. Territory), in the northwestern Pacific Ocean with signals with directions of arrival consistent with sources located at Ioto. The analysis presented here interprets signal features of the remote hydroacoustic recordings provided by HA11 in order to attempt to distinguish between volcanic earthquake signals and undersea eruption signals originating from Ioto. Histograms of hydroacoustic events interpreted as originating from Ioto correlate well with the in-situ seismic observations at Ioto in the early stage of volcanic activity. The results presented suggest that around 75% of the signals detected at HA11 with directions of arrival consistent with Ioto as their origin could be associated with undersea eruptions, supporting the conclusion that the IMS hydroacoustic stations can contribute to volcanic event remote monitoring.
中文翻译：
从国际监测系统的现场地震仪和远程水听器获得的对Ioto岛火山活动探测的解释。
现场地震观测发现，日本近海火山岛Ioto（以前的岩岛）的火山活动在2018年9月上旬有所增加。对近岸水域变色和当地天桥报告的飞溅的观测提供了海底喷发与火山喷发之间的联系的证据。记录的地震活动。然而，关于何时开始海底喷发以及岛上记录的多少原地地震活动与火山地震和海底喷发有关，仍存在不确定性。在此期间，美国威克岛（美国领土）的《全面禁止核试验条约》（CTBT）国际监测系统（IMS）水声台站HA11记录了大量水下声（水声）信号，在西北太平洋中，其到达方向与位于Ioto的源一致的信号。此处介绍的分析解释了HA11提供的远程水声记录的信号特征，以试图区分火山地震信号和源自Ioto的海底喷发信号。解释为起源于Ioto的水声事件的直方图与火山活动早期在Ioto进行的原位地震观测结果有很好的相关性。提出的结果表明，在HA11处检测到的信号的到达方向与Ioto一致，因为其起源可能与海底喷发有关，约占75％，这支持IMS水声台站可以促进火山事件远程监测的结论。
更新日期：2019-12-20
中文翻译：
从国际监测系统的现场地震仪和远程水听器获得的对Ioto岛火山活动探测的解释。
现场地震观测发现，日本近海火山岛Ioto（以前的岩岛）的火山活动在2018年9月上旬有所增加。对近岸水域变色和当地天桥报告的飞溅的观测提供了海底喷发与火山喷发之间的联系的证据。记录的地震活动。然而，关于何时开始海底喷发以及岛上记录的多少原地地震活动与火山地震和海底喷发有关，仍存在不确定性。在此期间，美国威克岛（美国领土）的《全面禁止核试验条约》（CTBT）国际监测系统（IMS）水声台站HA11记录了大量水下声（水声）信号，在西北太平洋中，其到达方向与位于Ioto的源一致的信号。此处介绍的分析解释了HA11提供的远程水声记录的信号特征，以试图区分火山地震信号和源自Ioto的海底喷发信号。解释为起源于Ioto的水声事件的直方图与火山活动早期在Ioto进行的原位地震观测结果有很好的相关性。提出的结果表明，在HA11处检测到的信号的到达方向与Ioto一致，因为其起源可能与海底喷发有关，约占75％，这支持IMS水声台站可以促进火山事件远程监测的结论。
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