From resonant Very Low Frequency (VLF) seismicity to seafloor deformation: bridging science and marine data validation in the Mayotte volcanic crisis

The ongoing seismo-volcanic crisis offshore Mayotte, initiated in May 2018 and associated to the formation of the new submarine volcano Fani Maoré, has led to the establishment of the REVOSIMA observatory. This large seafloor eruption has been documented through a combination of onshore and offshore instruments, offering an integrated dataset for studying seismic signals and seafloor deformation.
During my PhD at IPGP (2019–2023), I focused on the detection, location, and characterization of Very Low Frequency (VLF) events, oscillations dominated by ~15 s periods and higher modes. More than 780 signals were detected, located and interpreted as the resonance of a fluid-filled sill at 25-35 km depth, within Mayotte’s proximal active swarm.
In parallel, my current work focuses on seafloor pressure measurements acquired by absolute pressure gauges (A0A). These instruments, deployed and recovered during successive MAYOBS campaigns, require careful validation to account for long-term instrumental drift and observed anomalies. Understanding their behaviour and response is essential for detecting subtle deformation signals, if present.
Future perspectives aim at perform an integrative comparison of seafloor pressure, seismological and hydroacoustic records to establish a broadband spectral diagnostic of VLF events, with the long-term perspective of assessing their potential for early warning within submarine volcanic monitoring.

Also on ZOOM here: https://u-paris.zoom.us/j/3129957938?pwd=S2lISUFkSzVXNk52UFNYS1pzRkN2dz09