19–23 Jun 2023
Hofburg Palace & Online
Europe/Vienna timezone

A Recent Episode of Submarine Volcanic Activity in the South Sandwich Arc – Insights from International Monitoring System Hydrophone and T Phase Station Data

20 Jun 2023, 09:00


Board: 12
E-poster T1.3 The Oceans and their Properties Lightning talks: P1.3, P1.4, P5.2


Mr Dirk Metz (CTBTO Preparatory Commission)


We present a recent example for the civil and scientific application of International Monitoring System (IMS) hydroacoustic data. On 24 April 2022, IMS stations detected a cluster of impulsive, seismoacoustic events in the South Sandwich Arc, a volcanically active chain of remote islands and seamounts in the southern Atlantic Ocean. Preliminary results from automated and interactive analysis of hydrophone and T phase station data suggest that these events, which occurred over a period of less than two hours and which were preceded by at least two hour-long episodes of low level tremor, are likely volcanic in nature, and originated at or near one of several recently discovered seamounts offshore Candlemas and Saunders Island. Our findings are consistent with waveform data gathered by non-IMS stations as well as satellite observations and further highlight the potential of the IMS hydroacoustic network for detecting and studying submarine volcanic activity in some of the most remote regions on the planet.

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International Monitoring System hydroacoustic data help us to detect and study submarine volcanic activity in the South Sandwich Arc, one of the most remote regions on Earth.

E-mail [email protected]
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Primary authors

Mr Dirk Metz (CTBTO Preparatory Commission) Paulina Bittner (CTBTO Preparatory Commission) Isobel Yeo (National Oceanography Centre) Mr Tiago Oliveira (CTBTO Preparatory Commission) Mr Julien Vergoz (Commissariat à l’énergie atomique et aux énergies alternatives (CEA)) Mr Wolfgang Sommerer (CTBTO Preparatory Commission) Mario Zampolli (CTBTO Preparatory Commission) Mr Georgios Haralabus (CTBTO Preparatory Commission)

Presentation materials