All the contents of BRGM, the French geological survey, on ground and subsurface risks.

Ingrid Girardeau, BRGM Director in La Réunion, was awarded the Medal of Honour for BRGM’s commitment to Overseas France on 28 November 2025.
News
BRGM Réunion awarded the Medal of Honour for its contribution to Overseas France
8 Dec 2025
Freely flowing droplets, Isère
4
dec
2025
Paris / Online
Technical seminar
2025 Polluted sites and soils
Rehabilitation work on a brownfield site
Our solutions
Recycling excavated earth from potentially polluted sites and soils
You are a quarry operator, a developer or a public works contractor and you are not sure how to manage and recycle your excavated earth? The BRGM can provide support, from sampling to characterisation and treatment of these excavated soils.
After cyclone Garance hit Réunion, BRGM teams carried out more than 130 geological risk assessments on homes, as seen here in the Butor ravine.
Interview
Ingrid Girardeau and Manuel Parizot: "In Mayotte and Réunion, we are helping the local authorities to forestall and mitigate the effects of a cyclone on the islands"
25 Nov 2025
Cross-section of the volcanic structure beneath Mayotte. This three-dimensional representation provides a conceptual model of how the sections of the magma reservoir beneath the island might be connected.
Press release
A magma reservoir discovered under Mayotte
12 Nov 2025
Pierre-Yves Bard received the Dolomieu Prize on 28 October 2025.
News
BRGM's Dolomieu 2025 Prize awarded to Pierre-Yves Bard, a seismic-risk specialist
29 Oct 2025
The Forbach mine, Moselle
Video
Lorraine coalfield: how can we manage the rising groundwater?
21 Oct 2025
Geophysical acquisition by georadar at La Turballe (44) for the SIBLES2 project (April 2023).
Reference, completed project
SIBLES2: Characterisation of the dune geosystem in Pays de La Loire
13 Oct 2025
Very plastic Eocene to Oligocene clays (Pont-Péan, 2022).
Video
Science in questions: what is "clay shrinking and swelling"?
13 Oct 2025
Example of a slag deposit loaded with metallic elements on a former iron and steel site
4
sep
2025
8
sep
2025
Online
Webinar
Webinars on the BDSolU Urban Soil Analysis Database
Treatability tests for PFASs using reducers.
Feature article
PFAS: frequently asked questions (FAQs)
10 Sep 2025
In-line extraction and analysis of phytosanitary substances in water, Orléans
Article
What solutions are available for cleaning up PFAS contamination in soil and groundwater?
10 Sep 2025