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REVOSIMA @revosima.bsky.social · 06/07/2026

📄 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

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 08/07/2026

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 👇

nature.com

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...

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Observatoire volcanologique du Piton de la Fournaise @ovpf.bsky.social · 10/03/2026

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...

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Seismica @weareseismica.bsky.social · 16/04/2025

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...

Káldy et al, 2025.
Funding supported by: project RINGEN - research infrastructure upgrade No CZ.02.1.01/0.0/0.0/16_013/0001792 and Education and project SYNERGYS - systems for energy synergies No CZ.10.02.01/00/22_002/0000172.

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 01/02/2025

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! 🤞

Schematic illustration of the OHA-GEODAMS seafloor observatory. Credit: J.-A. Olive (LG-ENS) & J.-Y. Royer (Geo-Ocean)

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 01/02/2025

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.

An A-0-A pressure sensor, encased in a frame attached to four buoys floating on the ocean surface, waiting to be picked up. Credit: J.-A. Olive, LG-ENS / FOF

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 31/01/2025

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

Water color drawing of an acoustic transponder at the seafloor. Credit: J.-A. Olive, LG-ENS

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 31/01/2025

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.

2 iXblue/Exail Canopus acoustic transponders encased in yellow floats, atop 2-m tall metal tripods, waiting to be deployed on the back deck of R/V Marion Dufresne during the 2024 GEODAMS cruise. Credit: J.-A. Olive, LG-ENS / FOF

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 19/01/2025

Planning our upcoming deployments like they schedule sketches on Saturday Night Live (with multiple new versions since that v1 😜) #GEODAMS

@sismolise.bsky.social and @jaodynamics.bsky.social trying to figure out the most efficient schedule of operations in front of a post-it-covered whiteboard

a whiteboard covered in colored post-it notes representing the order of our instrument recoveries and deployments

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 30/01/2025

We also recovered and redeployed five hydrophones that were first deployed last year during the #GEODAMS 2024 cruise.

a hydrophone encased in an orange float just surfaced right in front of the R/V Marion Dufresne, on a calm sea. Credit: J.-A. Olive, LG-ENS / FOF

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 30/01/2025

We deployed 7 Ocean Bottom Seismometers (OBSs) to record earthquakes and other signals emitted by the Southeast Indian Ridge and the Amsterdam transform fault.

water color by D. Pacaud illustrating the deployment of an ocean bottom seismometer from the Marion Dufresne

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 20/01/2025

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.

Julie & Jean-Arthur bringing the glider to the workboat for deployment. Credit: E. Klein

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 19/01/2025

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.

Data coming live from the ship's multibeam echosounder

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 05/01/2025

Meet the #GEODAMS 2025 team! ⚒️ @earth-science.bsky.social Right to left, back to front 👇

Group picture of the GEODAMS 2025 team, on the deck of R/V Marion Dufresne, in front of Crozet Island

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 02/01/2025

Today we were treated to spectacular views of Crozet's Possession Island and East Island, while the local penguins put on quite a show! 🐧🌤️⛰️

the cliffs of Crozet's Possession Island. Credit: S. Furst

the spectacular cliffs of Crozet's East Island in the distance. Credit: S. Furst

curious penguins swimming all around the ship. Credit: S. Furst

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 01/01/2025

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.

$The R\V Marion Dufresne making its way through some fog$

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 31/12/2024

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

Our planned route across the Southern Indian Ocean. Credit: Claire Lo Monaco

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 31/12/2024

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.

Schematic overview of the OHA-GEODAMS observatory. Credit: J.-A. Olive & J.-Y Royer

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J.-A. Olive @jaodynamics.bsky.social · 28/12/2024

turns out the R/V Marion Dufresne is a spaceship

starry night from the deck of the R/V Marion Dufresne

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 26/12/2024

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!

a cloudy sunset from the R/V Marion Dufresne

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