📄 Bulletin mensuel du #REVOSIMA - juin 2026 . Retrouvez la synthèse des observations liées à l'activité volcano-tectonique au large de #Mayotte sur ce lien: www.ipgp.fr/volcanoweb/m... Et la version simplifiée ici👇 @cnrs-insu.bsky.social @ifremer.bsky.social @brgm.fr @ipgp.bsky.social
🌋 🌊 Comment capturer l'expansion du fond océanique ? Super dossier dans @lemonde.fr qui accompagne la sortie du papier dans @nature.com par les chercheur·ses de l'observatoire @geodams.bsky.social ! www.lemonde.fr/sciences/art...
Des chercheurs ont pu observer en direct l’expansion d’une dorsale océanique
Grâce à des instruments de mesure placés à près de 2 000 mètres de profondeur, au large de l’île Amsterdam, une équipe française avait pu suivre le phénomène tectonique, le 26 avril 2024. Les géophysi...
lemonde.fr
The news is out today in @nature.com ! The OHA-GEODAMS observatory had the incredible luck to capture a major seafloor spreading event back in 2024, just 2 months after its deployment. You can read all about it at: www.nature.com/articles/s41... Here’s how it unfolded 👇
Anatomy of a seafloor spreading event captured by in situ seismogeodesy - Nature
By combining hydroacoustic, direct-path ranging and bottom-pressure measurements, in situ observations of a rifting event at a segment of the Southeast Indian Ridge are reported, providing insight int...
nature.com
Communiqué OVPF-IPGP – 10/03/2026 🌋 1 site éruptif actif (flanc SSE) ✅ front du bras de coulée actif à ~1,7 km de la RN2 📈 inflation de l’édifice 📊 trémor globalement stable sur les dernières 24h ▶️ Niveau d’alerte : 2.1 ▶️ Communiqué complet ici: www.ipgp.fr/volcanoweb/r...
How well can we detect tiny, human-made earthquakes? Káldy et al, answer this question by testing automatic earthquake detection and localization with synthetic seismograms: a powerful validation tool! Read more: doi.org/10.26443/sei...
If it all goes well, our now-complete observatory will be the first to document seafloor spreading and transform faulting events with geodesy, hydro-acoustics, and seismology! 🤞
Last, but not least, we also recovered and re-deployed an A-0-A pressure sensor, right in the middle of the ridge's axial valley. This state-of-the-art instrument corrects its own drift by regularly re-calibrating itself against an inner chamber where the pressure is known.
But last week we succeeded in recovering and re-deploying 1 beacon from the ridge network, and 1 from the transform network. The first year of data did not disappoint! #ToBeContinued
The core of the OHA-GEODAMS project is to measure active deformation for 3 years on the Southeast Indian Ridge and the Amsterdam transform fault. To this end, in February 2024, we deployed 15 acoustic beacons that have been pinging each other every few hours ever since.
Planning our upcoming deployments like they schedule sketches on Saturday Night Live (with multiple new versions since that v1 😜) #GEODAMS
We also recovered and redeployed five hydrophones that were first deployed last year during the #GEODAMS 2024 cruise.
We deployed 7 Ocean Bottom Seismometers (OBSs) to record earthquakes and other signals emitted by the Southeast Indian Ridge and the Amsterdam transform fault.
A few days ago, we deployed a Sea Explorer glider developed by ALSEAMAR and owned by ENSTA Bretagne at the location of our first hydrophone, southeast of Amsterdam island.
As we make our way to our study area, we map the seafloor under the ship! 🌊 Our multibeam echosounder sends acoustic waves to the ocean floor and records how much time they take to bounce back.
Today we were treated to spectacular views of Crozet's Possession Island and East Island, while the local penguins put on quite a show! 🐧🌤️⛰️
Happy new year from the R\V Marion Dufresne! Our journey began last year on xmas day, by heading straight South from La Réunion to the Crozet Islands.
Our target site is located on the Southeast Indian Ridge, near Amsterdam Island. But to get there, the R/V Marion Dufresne will first loop across the Southern Indian Ocean to do all kinds of oceanographic and geochemical measurements, and swing by the Crozet Islands and Kerguelen. #OBSAustral2025
The goal of #GEODAMS is to deploy and maintain the first-of-its-kind seafloor seismo-geodetic observatory across a mid-ocean ridge and adjacent transform fault, to document seafloor spreading as it happens on a time scale of a few years.
Hi! We are the OHA-GEODAMS team, a research project documenting how the Indian Ocean grows in (almost) real time. Between 2024 and 2027, we'll have 4 cruises to maintain a seafloor seismo-geodetic observatory across the Southeast Indian Ridge. We just started cruise #2, follow our adventures here!
