MERCIER DE LEPINAY , Bernard

The August 14th 2021 Mw 7.2 Nippes, Haiti, earthquake is the second major event to strike southern Haiti this century, 11 years after the devastating Mw7.0 in 2010. The large magnitude earthquake and the possibility to access seismic data recorded since 2019 led us to investigate the variability of the site resonance frequency with time and...

Subduction of a narrow slab of oceanic lithosphere beneath a tightly curved orogenic arc requires the presence of at least one lithospheric scale tear fault. While the Calabrian subduction beneath southern Italy is considered to be the type example of this geodynamic setting, the geometry, kinematics and surface expression of the associated...

The main Marmara Fault exhibits numerous sites of fluid venting, observed during previous cruises and in particular with ROV VICTOR during the MARMARASCARPS cruise (2002). Long CALYPSO cores were recovered near active vents and at reference sites during the MARMARA-VT cruise (2004), together with echosounder sub-bottom profiles (frequency of...

The disastrous situation in Haiti, marked by escalating insecurity, failing institutions, and widespread gang control in the capital, severely hampers effective management of the country's natural hazards both now and in the foreseeable future. Yet earthquakes – or hurricanes and floods – are not going to stop. But at the moment, the Haitian...

Based on 2D seismic profiles, multibeam and seabed grab cores acquired during the Garanti cruise in 2017, 1–5 km wide seabed giant polygons were identified in the Grenada basin, covering a total area of ∼55,000 km2, which is the largest area of outcropping polygonal faults (PF) ever found on Earth so far. They represent the top part of an...

Based on an extensive seismic and multibeam dataset, 1-5 km wide giant polygons were identified at the bottom of the Grenada basin, covering a total area of ~55000 km². They represent the top part of an active underlying polygonal fault system due to the volumetric contraction of clay- and smectite-rich sediments during burial. To date, this is...