28 June 2021 to 2 July 2021
Europe/Vienna timezone

Observed laterally reflected hydroacoustic signals generated by underwater impulsive sound sources

29 Jun 2021, 09:00


e-Poster T1.3 - The Oceans and their Properties T1.3 e-poster session


Ivana Jukic (CTBTO Preparatory Commission, Vienna, Austria)


The International Monitoring System (IMS) of the CTBTO includes hydroacoustic stations composed of underwater hydrophones placed at the depth of the SOFAR channel. Since the hydroacoustic component of the network is designed to detect underwater nuclear explosions, events of special interest are impulsive underwater explosions. Among these, we studied several underwater explosions detonated close to the coast of Florida in September 2016 and 4 impulsive-like events (likely also underwater sources) from the Kamchatka area recorded in August 2020. In both cases, we observe secondary arrivals on IMS station HA11 for the Kamchatka sources and HA10 for the Florida sources immediately following the direct hydroacoustic arrivals. We assume these secondary arrivals are due to coastal reflections. We identify the potential reflection points for these reflections based on their back azimuths at the recording station and the estimated location of the impulsive sources. To verify this, we used the IDC standard hydroacoustic analysis tool HART and DTK-(G)PMCC, the latter provided to CTBTO authorized users, to estimate back azimuths. Comparisons between sources in the same general area give us an idea of the consistency of these reflections between sources in the same general area.

Promotional text

From this study of reflected hydroacoustic signals generated by underwater impulsive sources it is evident that the IMS in-water hydroacoustic stations can detect signals of high relevance to CTBTO and also that the IDC processing analyst tools are applicable to define them.

Primary author

Ivana Jukic (CTBTO Preparatory Commission, Vienna, Austria)


Peter Louring Nielsen (CTBTO Preparatory Commission, Vienna, Austria) Ronan Le Bras (CTBTO Preparatory Commission, Vienna, Austria) Paulina Bittner (CTBTO Preparatory Commission, Vienna, Austria) Aaron Joseph Gutierrez Jimenez (CTBTO Preparatory Commission, Vienna, Austria) Baby Jane Punongbayan (CTBTO Preparatory Commission, Vienna, Austria)

Presentation materials