iiinova — where your digital self keeps evolving

Reposted by Anne Briais

European Geosciences Union (EGU) @egu.eu · 19/08/2026

Are you based in the #EU and into #policy? Spend a week at the EU Parliament in Brussels- apply now for the EGU's Policy Pairing Scheme 2026! Work alongside a Member of the European Parliament for up to a week. 📝 Apply here: egu.eu/01DOHF 📆 Tuesday 1 September 2026 👉Learn more here: egu.eu/19K4N1

Image description: Eu Parliament with European flags. Text reads:'' EGU’s Policy Pairing scheme 2026! Apply now to experience life inside the European Parliament!1 September 2026''

013

Reposted by Anne Briais

UMR Geo-Ocean @geo-ocean.bsky.social · 09/03/2026

📣HARMONYSE a réuni scientifiques, compositeur et musiciens autour de l’océan profond et sa biosphère. L'oeuvre est prête!!! 🥳 Conférence (1h): mercredi 11 mars 19h Auditorium, méd. François Mitterand / Les Capucins Ciné-concert (2h): mercredi 11 mars 20h30 Place des Machines, Les Capucins

HARMONYSE est un projet cinématographique et orchestral à but non lucratif, réunissant scientifiques, compositeurs et musiciens afin de sensibiliser le grand public à l’océan profond et à la richesse de sa biosphère. Concrètement, il s’agit d’un montage vidéo 4K d’environ 30 minutes (principalement composé d’images issues de plongées scientifiques en submersible) ayant inspiré une composition orchestrale originale (compositeur : Yves Pignot). La vidéo et la partition seront mises à disposition (licence CC BY-NC-ND 4.0) des organisations à but non lucratif, des orchestres et des acteurs de la recherche en sciences marines intéressés, avec pour objectif final une appropriation et une interprétation par des orchestres pour des publics locaux (par exemple des orchestres universitaires en association avec des instituts locaux de recherche marine).

021

Reposted by Anne Briais

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 🐧

075

Reposted by Anne Briais

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!

085

Reposted by Anne Briais

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

0116

Reposted by Anne Briais

Geology of the Tour de France @geotdf.bsky.social · 19/07/2025

One more Pyrenees stage! And luckily, we have one more Pyrenees clip! How the deepest rocks end up on the highest peaks! youtu.be/0t4EifLi-zU?...

youtu.be

GeoTdF 2023 - Stage 5: Earth's mantle

YouTube video by Geo-Sports - The Geology of Sports Events

13815

Reposted by Anne Briais

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

Pierre-Yves Raumer @pyraumer.bsky.social is a PhD student at Geo-Ocean in Brest. With a background in computer science, Pierre-Yves develops machine learning techniques to automate and improve the analysis of hydrophone records, teasing apart whale songs, icequakes and earthquakes in record time!

151

Reposted by Anne Briais

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

Jean-Arthur Olive @jaodynamics.bsky.social is a CNRS Research Scientist at ENS in Paris, and co-chief scientist on #GEODAMS. J-A uses mechanical models and geophysical observations to understand how the lithosphere deforms at tectonic plate boundaries, with mid-ocean ridges being his clear favorite.

051

Reposted by Anne Briais

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

Measuring travel time and knowing the speed of sound in water, the echosounder provides depth measurements along swaths, which we combine to create bathymetric maps, revealing underwater landscapes, submarine volcanoes, and ridges.

The difference between satellite-based bathymetry (left, Smith & Sandwell, 1997) and ship-acquired multibeam bathymetry of the Southeast Indian Ridge (Loubrieu et al.)

0103

Reposted by Anne Briais

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

Using broadband OBSs, we will also carry out compliance measurements: that's looking at how the oceanic crust responds to changes in water pressure at the seafloor, due to tides and ocean dynamics. This should tell us whether magma is present at depth in the crust.

A broadband OBS being deployed from the side of the ship. The green sphere is the instrument, kept away from the noise of the batteries and data loggers by the white "arm". Credit: L. Retailleau, IPGP/FOF

161

Reposted by Anne Briais

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

This local network will let us locate the events with high precision to characterize how mid-ocean ridge faults slip.

Deployment of a short-period OBS, hanging on a cable over the ocean, from the side of the ship. Credit: L. Retailleau. IPGP/FOF

171

Reposted by Anne Briais

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

184

Reposted by Anne Briais

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

Once comfortably settled in the SOFAR channel, hydrophones record the sound made by earthquakes near and far, and let us relocate them with much better accuracy than distant seismometers on land.

141

Reposted by Anne Briais

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

They also record whale songs, and even the sound of icebergs grinding against each other! See for example this great explainer video from @noaa.gov : oceanexplorer.noaa.gov/explorations...

oceanexplorer.noaa.gov

NOAA Ocean Explorer: Submarine Ring of Fire 2003: Hydroacoustics Animation

051

Reposted by Anne Briais

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

164

Reposted by Anne Briais

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

052

Reposted by Anne Briais

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

Some deployments can take up to 11 hours, as we go through trial-and-error on different target sites with the tripod hanging from the ship on a 2-km long cable.

Jean-Yves eagerly waiting for the transponder to respond. Credit: J.-A. Olive, LG-ENS / FOF

The control center from where we follow the transponders' deployments. Credit: J.-A. Olive, LG-ENS / FOF

131

Reposted by Anne Briais

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

133

Reposted by Anne Briais

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

We start by deploying the float containing the hydrophone from the back deck, then unroll the ~2 km long mooring...

172

Reposted by Anne Briais

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

183

Reposted by Anne Briais

Sara Satolli @sarasatolli.bsky.social · 22/01/2025

Volume 395 of the Proceedings of the #IODP #Exp395, Reykjanes Mantle Convection and Climate, was published online today, 21 January 2025. Enjoy! publications.iodp.org/proceedings/...

publications.iodp.org

Proceedings of the International Ocean Discovery Program Volume 395

Reykjanes Mantle Convection and Climate

011

Reposted by Anne Briais

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

1124

Reposted by Anne Briais

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

We will recover it at the location of our last hydrophone, West of Amsterdam, next week.

021

Reposted by Anne Briais

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

This glider is equipped with a hydrophone (48kHz) to record the underwater soundscape, and in particular the cetaceans (i.e., blue whales, fin whales, killer whales, sperm whales, etc.). The glider will navigate south and west of Amsterdam, diving down to 1000 m, driven by buoyancy changes.

Deploying the glider from the workboat, with the Marion Dufresne in the background

131

Reposted by Anne Briais

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

In the meantime, Julie stayed on the Marion Dufresne, to manage communications between the pilot team in Brest and the team on the workboat.

121

Reposted by Anne Briais

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

In order to prevent the glider from colliding with the Marion Dufresne, it had to be launched at a certain distance. To do so, 3 brave members of our GEODAMS team, Anne, Séverine and Diane, boarded a workboat with 2 LDA crew members.

Séverine, Anne and Diane all dressed up to deploy the glider from the workboat

Deploying the workboat, with the glider in the front

131

Reposted by Anne Briais

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

395

Reposted by Anne Briais

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

043

Reposted by Anne Briais

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

072

Reposted by Anne Briais

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

the perks of the Furious Fifties

081

Reposted by Anne Briais

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

083

Reposted by Anne Briais

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

Anne Briais @annebriais.bsky.social is a CNRS Research Scientist at Geo-Ocean in Brest. An expert in ocean geodynamics, Anne has participated in many research cruises to better understand how mid-ocean ridges interact with mantle hot (or cold!) spots.

131

Reposted by Anne Briais

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

1114

Reposted by Anne Briais

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

This time, on OBS-Austral 2025, we aim to get our first increment of data while completing the GEODAMS observatory with 7 OBSs 🤞

041

Reposted by Anne Briais

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

In February 2024, as part of the OBS-Austral 2024 cruise, we installed 15 acoustic beacons, 5 hydrophones and 1 A-0-A pressure gauge on and around the Southeast Indian Ridge at 37ºS.

Map of the axis of the Southeast Indian Ridge and Amsterdam Transform Fault showing the GEODAMS geodetic network deployed in February 2024. Credit: J.-Y. Royer

241

Reposted by Anne Briais

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

At the same time, we will listen to the geological activity with hydrophones moored in the SOFAR channel, and ocean bottom seismometers (OBSs). This will help us interpret seafloor displacements in terms of deep magmatic or tectonic deformation sources.

111

Reposted by Anne Briais

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

To answer them, we will measure (relative) horizontal and vertical displacements of the seafloor, for 3 years, using direct path ranging beacons and A-0-A drift-controlled pressure gauges.

121

Reposted by Anne Briais

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

Key questions include: do mid-ocean ridge faults slip seismically? aseismically? both? What are the basic events of extension (e.g., earthquake, eruption...), and how do they interact? How does slip on a transform fault impact deformation at the nearby ridge segment, and vice-versa?

121

Reposted by Anne Briais

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

1106

Reposted by Anne Briais

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

And of course no visit to Crozet on the Marion Dufresne would be complete without the traditional Croziflette dinner!

Croziflette: a French pasta bake with crozets (that's the point), bacon and reblochon

051

Reposted by Anne Briais

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

052

Reposted by Anne Briais

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.

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

173

Reposted by Anne Briais

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

164

Reposted by Anne Briais

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

192

Anne Briais @annebriais.bsky.social · 26/12/2024

Les équipes d'Obs-Austral sont parties pour 6 semaines de mer sur le navire Marion Dufresne. De Geo-Ocean, Jean-Yves Royer, Pierre-Yves Raumer, Edgar Lenhof et moi formons une partie de l'équipe de GEODAMS pour installer des sismomètres fond de mer et des hydrophones près de l'Ile d'Amsterdam.

Le Marion Dufresne sort du port de La Réunion le 25 décembre au départ de la mission Obs-Austral combinant plusieurs projets scientifiques et d’observation de l’océan indien.

040

Reposted by Anne Briais

Yann Klinger @yklinger.bsky.social · 16/12/2024

⚒️ Looking for a PhD in numerical modeling about earthquake cycle and surface deformation using Discrete Element Modelling? Join us at IPGP, open position to start next Fall 2025. Possibilities of funding for master internship prior to PhD if needed. For information and application, just email me.

044

Reposted by Anne Briais

Geomorphica @geomorphica.bsky.social · 06/11/2023

Hello new followers! Please repost so we can reach a much wider audience!

13864