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Reposted by J.-A. Olive

Hugo Boulze @hugoboulze.bsky.social · 10/08/2026

⚠️New paper⚠️ Curious about the link between seafloor deformation, mush viscosity, and magma replenishment at #mid-ocean ridges? Check out our new paper on #EPR with @jaodynamics.bsky.social doi.org/10.1029/2026...

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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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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 09/02/2026

What a day! We visited Kerguelen station, met king penguins and elephant seals, and walked on the "Desolation Island". Just a few days before reaching the OHA-GEODAMS area, this was an unforgettable stop in the middle of the Southern Ocean. Cheers to the penguins 🐧

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 03/02/2026

On our way to the Southeast Indian Ridge and it’s all hands on deck 🚢🔧 From building tripods for acoustic beacons to installing the transducer and modem in the ship’s forward hold, operational prep is well underway!

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 24/01/2026

The 2026 GEODAMS team safely arrived close to Possession Island in the Crozet archipelago a few days ago. A penguin crowd welcomed us under a very bright sky and with the traditional croziflette that follows... 🐧 🍽️ We’ve had our fill, both for the eyes and the stomach.

Penguin crowd at la Manchotière from Possession Island

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 20/01/2026

The OHA-GEODAMS team is back to document how the Indian Ocean grows. Cruise #3 on board Marion Dufresne left La Réunion Island a few days ago to maintain the multi-sensor observatory on the South East Indian Ridge. Follow us on this new adventure! (credit photo: Ewen & Didier)

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Proceedings of the National Academy of Sciences @pnas.org · 20/10/2025

Researchers successfully predicted a seafloor eruption at a midocean ridge in April 2025 by tracking hydrothermal fluid temperatures. A 35-year record reveals that temperature increases from 350°C to 390°C may reliably forecast eruptions. In PNAS: ow.ly/lrwZ50Xf1v0

Alvin submersible working at an active high-temperature hydrothermal vent located on the East Pacific Rise at 2,510 m depth.
CREDIT: Dan Fornari, Woods Hole Oceanographic Institution and Thibaut Barreyre, CNRS - U. Brest; National Deep Submergence Facility, HOV Alvin Team, WHOI-MISO Facility, National Science Foundation.

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J.-A. Olive @jaodynamics.bsky.social · 19/05/2025

🎓 #PhD opportunity in Paris! Join us at @geosciences.bsky.social to study how magma reservoirs beneath mid-ocean ridges pressurize and trigger eruptions. Part of the @erc.europa.eu #SeaSALT project with strong international links. Background in (geo)physics? Apply now! tinyurl.com/yupkweya

emploi.cnrs.fr

Portail Emploi CNRS - Offre d'emploi - PhD position on the dynamics of mid-ocean ridge magma reservoirs (M/F)

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Javier Escartín @jescartin.bsky.social · 02/05/2025

🧪⚒️ The New eruption @ the East Pacific Rise after a cycle of melt accumulation & seafloor uplift. Several years of follow up by Thibaut Barreyre (CNRS@GeoOcean) & coPIs will tell how these events build the oceanic crust, 1 eruption @ a time - & comeback of ecosystems www.nytimes.com/2025/05/02/s...

nytimes.com

Volcanic Eruption in Deep Ocean Ridge Is Witnessed by Scientists for First Time

Researchers diving in a submersible in the eastern Pacific realized that the landscape they had studied the day before had been glassed over by fresh lava.

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Maya Wei-Haas, PhD @mayaweihaas.bsky.social · 02/05/2025

**BIG NEWS in the geology world!** For the first time, scientists spotted an active eruption along the mid-ocean ridge!! They visited the hydrothermal vent the day before, where a vibrant ecosystem thrived in the sweltering water. The next day, everything was gone. ⚒️🧪 My latest for @nytimes.com

nytimes.com

Volcanic Eruption in Deep Ocean Ridge Is Witnessed by Scientists for First Time (Gift Article)

Researchers diving in a submersible in the eastern Pacific realized that the landscape they had studied the day before had been glassed over by fresh lava.

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La Science, CQFD @sciencecqfd.bsky.social · 02/04/2025

[RDV 16h !] A la fin du XXe siècle, les travaux de l’océanographe Marie Tharp ont bouleversé la géologie et notre connaissance de la tectonique des plaques. Quelles furent ces découvertes et leurs impacts ? tinyurl.com/26xwkx4y avec @jescartin.bsky.social, Cécile Prigent et Laurent Jolivet

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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 · 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

For the last ~10 days, we've been hard at work on and around the Southeast Indian Ridge at 37ºS to recover and redeploy a bunch of geophysical instruments. Let's break it down 👇

Regional map of the Southeast Indian Ridge near Amsterdam Island

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Javier Escartín @jescartin.bsky.social · 16/01/2025

⚒️🧪🌊 25/25 -The #VG2024 leader completed the race after 64j19h22 at 17.8 knots. More than 26700 nm (~51000 km) crossing 4 major mid-ocean ridges (Mid-Atlantic, Southwest, South East & East Pacific Rise) & around Antarctica. Thnks to @jie-chen.bsky.social for the Spilhaus map: doi.org/10.1038/s415...

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J.-A. Olive @jaodynamics.bsky.social · 20/01/2025

off you go, Glidy! come back with lots of 🐋 sounds

workboat deploying a glider in the open ocean

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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 · 14/01/2025

A tradition aboard the Marion Dufresne is to stamp letters to be mailed from the French Southern and Antarctic Lands. The ship captain, chief mechanic, doctor... each have their own stamp, and the science teams make new, custom ones every year!

@jbeesau.bsky.social carefully applying an official Marion Dufresne stamp on the mail. Credit: C. Dimier

the official OHA-GEODAMS 2025 stamp: an illustration of our seismo-geodetic network across the mid-ocean ridge + the glider listening to whale sounds. Credit: J.-Y. Royer

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Javier Escartín @jescartin.bsky.social · 12/01/2025

⚒️🧪🌊 24/n - & the #VG2024 lead is near King's Trough, a failed rift formed perpendicular to the ridge axis 40 to 25 Myrs ago, now fossilised. First named by Laughton in '65 and described in detail by Matthews et al. in '69, the rift is a few km deep, and reaches 6000 m bsl @ Keep Deep to the East.

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The OHA-GEODAMS Seafloor Observatory @geodams.bsky.social · 13/01/2025

We're back in business after a rough storm west of Kerguelen! We're now sheltered from the waves (but not the wind!) in the Gulf of Morbihan, enjoying our first views of the island and prepping the logistics of next week's deployments.

big wave crashing against the prow of R/V Marion Dufresne. Credit: S. Furst

barometer highlighting the low-pressure zone (965 hPa) we just went through. Credit: S. Furst

Kerguelen island in the distance. Credit: J.-A. Olive

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Javier Escartín @jescartin.bsky.social · 12/01/2025

⚒️🧪🌊 23/n - The #VG2024 sailed over Great Meteor Guyot - part of a set of hotspot seamounts formed 20 to Myrs ago, possibly linked to the Azores hotspot to the N. The Guyot is flat topped due to wave erosion & later subsidence. It was 1st mapped & named during the N Atlantic Meteor cruise in 1937.

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J.-A. Olive @jaodynamics.bsky.social · 10/01/2025

our regularly scheduled @geodams.bsky.social programming will resume when the ship returns to a more horizontal position

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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 · 05/01/2025

For several days now, several species of seabirds have been making their way with us. We've seen: the great albatross, the sooty albatross, yellow-billed albatross, black-browed albatross, giant petrels, white-chinned petrels and many others whose identification is not always easy.

black-browed albatross. Credit: Julie Béesau

white-chinned petrel. Credit: Julie Béesau

yellow-billed albatross. Credit: Julie Béesau

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J.-A. Olive @jaodynamics.bsky.social · 05/01/2025

the perks of the Furious Fifties

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Javier Escartín @jescartin.bsky.social · 05/01/2025

⚒️🧪🌊 21/n - The #VG2024 tracks N the S-wards path from a month ago, over the Equatorial Atlantic (posts 3-6). Here most transform zones link continental margins & the ridge axis, peristing tens of millions of years. Others form & disappear, transition to oblique offsets that migrate over time.

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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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J.-A. Olive @jaodynamics.bsky.social · 02/01/2025

Crozet Island’s 🐧 welcoming committee never disappoints #OBSAustral2025 #GEODAMS

close up shot of a penguin swimming below the ocean surface

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Javier Escartín @jescartin.bsky.social · 01/01/2025

⚒️🧪🌊 20/n - #VG2024 sailing NE along the Brazilian coast, soon xssing the tracks of the start of VG2024. And sailing by the Vitoria Trinidad seamount chain, the track of the Trinidade hotspot. Volcanism is ~40 My near the coast, and at <500 kyrs at the Martin Vaz & Trinidad Islands to the East.

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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

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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Jackie Caplan-Auerbach @geophysichick.bsky.social · 28/12/2024

Did you know that there's an undersea volcano off of the Oregon/Washington coast? And did you know that's acting up? Let's unpack what this means, and what we know. 🧵

sciencenews.org

Scientists predict an undersea volcano eruption near Oregon in 2025

Real-time data from Axial Seamount off the Oregon coast is providing researchers with a good eruption forecasting test.

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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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J.-A. Olive @jaodynamics.bsky.social · 26/12/2024

Off to sea again! Another long journey across the Southern Indian Ocean to complete our #GEODAMS seismo-geodetic observatory on the Southeast Indian Ridge. Follow us at @geodams.bsky.social !

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Javier Escartín @jescartin.bsky.social · 21/12/2024

⚒️🧪🌊 17/n - #VG2024 lead crossed the Pacifc-Antarctic Ridge, south of the Nemo Point - farthest from land, some 2700 km from the nearest shore - & unmapped. The Fracture Zones here dissecting the ridge are named after some of the pioneers of marine geology - including Marie Tharp and Bruce Heezen.

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J.-A. Olive @jaodynamics.bsky.social · 03/12/2024

Very grateful to have been awarded an #ERCCoG grant! The SeaSALT project aims at understanding how individual diking and fault slip events compete to accommodate extension at mid-ocean ridges… and end up shaping 2/3 of our planet’s surface. Stay tuned for future PhD/postdoc opportunities at ENS!

Seismicity of the global mid-ocean ridge system. Spilhaus projection map by J. Chen

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Javier Escartín @jescartin.bsky.social · 10/11/2024

⚒️🌊 - 1/n - Today, 10th #VendeeGlobe 40 skippers sail from Sables d'Olonne: Atlantic, around Antarctica (Pacific & Indian oceans), back Atlantic. Will blog about marine geology & related topics following the race - till mid Jan if enough interest here. www.vendeeglobe.org/cest-quoi-le...

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J.-A. Olive @jaodynamics.bsky.social · 30/11/2024

Hi there! My name is Jean-Arthur Olive, I’m a ☕️-fueled geodynamicist with a soft spot for mid-ocean ridges. My group and I study how brittle deformation of Earth’s lithosphere shape tectonic plate boundaries, from human to geological time scales.

pretending to be a geologist by looking at deformed rocks next to a stormy ocean

modeling how rift faults respond to river erosion, from https://www.pnas.org/doi/full/10.1073/pnas.2115077119

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