CTBT: Science and Technology Conference 2025 - SnT2025

Interpretation of Bolide infrasonic observation on 25 August 2024 in South Africa

P5.1-341

Not scheduled

20m

Zeremoniensaal

E-poster T5.1 Synergies with Global Challenges P5.1 Synergies with Global Challenges

Speaker

Jean Bernardo Andrianaivoarisoa (Institute and Observatory of Geophysics of Antananarivo (IOGA))

Description

On 25 August 2024, around 6h50 UT, Bolide impacted the Earth atmosphere over South Africa. This event was recorded at some IMS infrasound arrays in Southern Africa. Data analysis were performed using GTK-PMCC software (CTBTO) based on PMCC method (Y. Cansi 1995). A pass-band frequency between 0.1 Hz and 4 Hz is applied to detect the source. As results from infrasound station I47ZA, azimuth is around 180° for the coming infrasound signals. Infrasound processing gave an estimated energy of 0.09 kT. Acoustic simulation of propagation using Raytracing technique (Virieux, 2004 Hamiltonian mathod ; Bass & Sutherland, 2003 absorption model) shows dominant stratospheric phases.