Megameter propagation and correlation of T-waves from Kermadec Trench and Islands
On 18 June 2020 and 4 March 2021, very energetic low-frequency underwater T-wave signals (2 to 25 Hz) were recorded at the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydrophone stations in the Pacific Ocean (Stations HA11 and HA03) and the South Atlantic Ocean...
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ftdoajarticles:oai:doaj.org/article:3f1f15d7905642b18b749cdb3bea31f8 2023-05-15T18:21:14+02:00 Megameter propagation and correlation of T-waves from Kermadec Trench and Islands Tiago C. A. Oliveira Peter Nielsen Ying-Tsong Lin Noriyuki Kushida Sérgio M. Jesus 2022-11-01T00:00:00Z https://doi.org/10.3389/fmars.2022.1009013 https://doaj.org/article/3f1f15d7905642b18b749cdb3bea31f8 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.1009013/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.1009013 https://doaj.org/article/3f1f15d7905642b18b749cdb3bea31f8 Frontiers in Marine Science, Vol 9 (2022) underwater soundscape 3DPE CTBT-IMS passive acoustics DTK-GPMCC submarine earthquake Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.1009013 2022-12-30T20:19:48Z On 18 June 2020 and 4 March 2021, very energetic low-frequency underwater T-wave signals (2 to 25 Hz) were recorded at the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydrophone stations in the Pacific Ocean (Stations HA11 and HA03) and the South Atlantic Ocean (Station HA10). This work investigates the long-range (megameters) propagation of these T-waves. Their sources were three powerful submarine earthquakes in the Kermadec Trench and Islands, located at approximately 6000, 8800, and 15100 km from Stations HA11, HA03, and HA10, respectively. Arrival time and back azimuth of the recorded T-waves were estimated using the Progressive Multi-Channel Correlation algorithm installed on the CTBT Organization (CTBTO) virtual Data Exploitation Centre (vDEC). Different arrivals within the duration of the earthquake signals were identified, and their correlations were also analyzed. The data analysis at HA03 and HA10 revealed intriguing T-wave propagation paths reflecting, refracting, or even transmitting through continents, as well as T-wave excitation along a chain of seamounts. The analysis also showed much higher transmission loss (TL) in the propagation paths to HA11 than to HA03 and HA10. Moreover, strong discrepancies between expected and measured back azimuths were observed for HA11, and a three-dimensional (3D) parabolic equation model was utilized to identify the cause of these differences. Numerical results revealed the importance of 3D effects induced by the Kermadec Ridge, Fiji archipelago, and Marshall Islands on T-wave propagation to HA11. This analysis can guide future improvements in underwater event localization using the CTBT-IMS hydroacoustic sensor network. Article in Journal/Newspaper South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Pacific Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
underwater soundscape 3DPE CTBT-IMS passive acoustics DTK-GPMCC submarine earthquake Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
underwater soundscape 3DPE CTBT-IMS passive acoustics DTK-GPMCC submarine earthquake Science Q General. Including nature conservation geographical distribution QH1-199.5 Tiago C. A. Oliveira Peter Nielsen Ying-Tsong Lin Noriyuki Kushida Sérgio M. Jesus Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
topic_facet |
underwater soundscape 3DPE CTBT-IMS passive acoustics DTK-GPMCC submarine earthquake Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
On 18 June 2020 and 4 March 2021, very energetic low-frequency underwater T-wave signals (2 to 25 Hz) were recorded at the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydrophone stations in the Pacific Ocean (Stations HA11 and HA03) and the South Atlantic Ocean (Station HA10). This work investigates the long-range (megameters) propagation of these T-waves. Their sources were three powerful submarine earthquakes in the Kermadec Trench and Islands, located at approximately 6000, 8800, and 15100 km from Stations HA11, HA03, and HA10, respectively. Arrival time and back azimuth of the recorded T-waves were estimated using the Progressive Multi-Channel Correlation algorithm installed on the CTBT Organization (CTBTO) virtual Data Exploitation Centre (vDEC). Different arrivals within the duration of the earthquake signals were identified, and their correlations were also analyzed. The data analysis at HA03 and HA10 revealed intriguing T-wave propagation paths reflecting, refracting, or even transmitting through continents, as well as T-wave excitation along a chain of seamounts. The analysis also showed much higher transmission loss (TL) in the propagation paths to HA11 than to HA03 and HA10. Moreover, strong discrepancies between expected and measured back azimuths were observed for HA11, and a three-dimensional (3D) parabolic equation model was utilized to identify the cause of these differences. Numerical results revealed the importance of 3D effects induced by the Kermadec Ridge, Fiji archipelago, and Marshall Islands on T-wave propagation to HA11. This analysis can guide future improvements in underwater event localization using the CTBT-IMS hydroacoustic sensor network. |
format |
Article in Journal/Newspaper |
author |
Tiago C. A. Oliveira Peter Nielsen Ying-Tsong Lin Noriyuki Kushida Sérgio M. Jesus |
author_facet |
Tiago C. A. Oliveira Peter Nielsen Ying-Tsong Lin Noriyuki Kushida Sérgio M. Jesus |
author_sort |
Tiago C. A. Oliveira |
title |
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
title_short |
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
title_full |
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
title_fullStr |
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
title_full_unstemmed |
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands |
title_sort |
megameter propagation and correlation of t-waves from kermadec trench and islands |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.1009013 https://doaj.org/article/3f1f15d7905642b18b749cdb3bea31f8 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.1009013/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.1009013 https://doaj.org/article/3f1f15d7905642b18b749cdb3bea31f8 |
op_doi |
https://doi.org/10.3389/fmars.2022.1009013 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1766200397650722816 |