Hydroacoustic Signals Originating from Marine Volcanic Activity at Kadovar Island, Papua New Guinea, Recorded by the Comprehensive Nuclear-Test-Ban Treaty International Monitoring System
Hydroacoustic Signals Originating from Marine Volcanic Activity at Kadovar Island, Papua New Guinea, Recorded by the Comprehensive Nuclear-Test-Ban Treaty International Monitoring System
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DOI：
10.1007/s00024-022-03096-8
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发表时间：
2022-07
影响因子：
2
通讯作者：
H. Matsumoto;M. Zampolli;G. Haralabus;J. Stanley;James Robertson;N. Özel
中科院分区：
文献类型：
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作者：
H. Matsumoto;M. Zampolli;G. Haralabus;J. Stanley;James Robertson;N. Özel
本文研究了由《全面禁止核试验条约》（《全面禁试条约》）国际监测系统（IMS）水声站HA11 Wake Island（美国）记录的源自Kadovar岛（巴布亚新几内亚）海洋火山活动的水声信号。两次发现火山活动高峰期，相隔一个月。研究的事件与2018年1月至2月期间的初始喷发系列有关。根据当地的视觉观察，卡多瓦火山在山顶开始喷发，然后在海岸附近形成了一个新的喷口。这一系列事件还包括熔岩圆顶的坍塌。利用互相关技术计算了在HA11探测到的水声信号的到达方向估计数，从而能够区分源自Kadovar火山活动的水声信号和源自太平洋地震活动的许多其他水声信号。国际监测系统区域地震台站无法识别与Kadovar有关的地震信号，这表明这些事件起源于海底。另一方面，位于Kadovar和HA11之间的马努斯岛的地震仪发现了来自Kadovar火山活动的水声信号。该研究表明，一系列爆炸性爆发，随后是不寻常的隆隆声和宽带信号加上隆隆声，可能会将卡多瓦岛熔岩圆顶坍塌事件的时间限制在2018年2月9日00：30 UTC，00：33 UTC和00：46 UTC。考虑到这一观测结果与附近Blup Blup岛目击者报告的海啸发生的一致性，作者将这一特定的水声信号解释为对这一海啸发生事件的远程观测。这项研究的目的是评估国际监测系统水声数据在其他监测稀少地区进行地质灾害远程监测的潜在附加值。
Hydroacoustic signals originating from marine volcanic activity at Kadovar Island (Papua New Guinea), recorded by the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydroacoustic (HA) station HA11 Wake Island (USA), are examined herein. Episodes of high volcanic activity were identified on two occasions, separated by a period of 1 month. The events studied pertain to an initial eruption series during a period between January and February 2018. Based on local visual observations, the Kadovar volcano began to erupt at the summit and then created a new vent spot near the coast. This series of events also included the collapse of a lava dome. Direction-of-arrival estimates for the hydroacoustic signals detected at HA11 were computed using a cross-correlation technique, which allowed for the discrimination between hydroacoustic signals originating from the Kadovar volcanic activity and numerous other hydroacoustic signals attributed to seismic activity in the Pacific Ocean. The Kadovar-related seismic signals could not be identified by regional IMS seismic stations, suggesting a submarine origin of these events. On the other hand, hydroacoustic signals originating from the Kadovar volcanic activity were identified by the seismometer at Manus Island, which is located between Kadovar and HA11. The study suggests that a series of explosive bursts followed by an unusual rumble and a broadband signal plus rumble may constrain the time of the lava dome collapse event at Kadovar Island to 00:30 UTC, 00:33 UTC, and 00:46 UTC on 09 February 2018. Given the compatibility of this observation with the tsunami generation reported by eyewitnesses on the nearby island of Blup Blup, the authors interpret this particular hydroacoustic signal as being a remote observation of this tsunamigenic event. The objective of this study was to assess the potential added value of IMS hydroacoustic data for remote surveillance of geohazards in otherwise sparsely monitored areas.