CTBT: Science and Technology Conference 2025 - SnT2025

Relation between rainfall variability and signals characteristics of infrasound events during the dry season in the central highland region of Madagascar

P1.1-794

12 Sept 2025, 12:00

1h

Zeremoniensaal

Board: 14

E-poster T1.1 The Atmosphere and its Dynamics P1.1 The Atmosphere and its Dynamics

Speaker

Dr Andry Harifidy Ramanantsoa (Institute and Observatory of Geophysics of Antananarivo (IOGA))

Description

Infrasound is one of four technologies dedicated to monitor nuclear explosions. It is used as well to study other issues for the benefit of science or to improve human life. Nowadays, rainfall variability is a widely discussed topic due to climate change. This work probes the relationship between rainfall variability and the characteristics of infrasound signals recorded during the dry season in the central highland region of Madagascar. The analysis of rainfall patterns uses precipitation data and infrasound bulletins from 2003 to 2024. To obtain characteristics (azimuth, frequency contents, amplitude) of infrasound events. Infrasound data are processed by DTKPMCC. The results provide new perceptions into how infrasound behavior during the dry season correlates with rainfall variability. Among all infrasound events analysed, which serves as the most reliable indicator of rainfall variability?