Embedded Files
ERC ABYSS
ERC ABYSS
Starting in October 2022 ABYSS project will open the way for Monitoring giant subduction faults using distributed acoustic measurements on the seafloor.
The objective of the ABYSS project is to probe the mechanical state of a fault zone prior to several large earthquakes (magnitude > 6) in order to identify systematic markers of the earthquake preparatory phase. The chosen target is one of the most active faults on Earth: the Chilean subduction zone. A promising technology will be used, the distributed acoustic measurement on optical fibers, which allows to detect earthquakes thanks to underwater telecommunication cables. ABYSS will rely on the GTD network along the Chilean coast and strong collaboration with CSN. This unprecedented observation capability, combined with the development of real-time data stream processing, will strengthen the early warning system in Chile by improving the speed and accuracy of seismic warnings.
Shallow crustal imaging offshore Chile using continuous DAS observations. The ABYSS network reveals lateral velocity variations invisible to land-based seismic networks.
Converted Ps phases recorded by DAS can improve rapid magnitude estimation for earthquake early warning. The study highlights the value of offshore fiber-optic cables for subduction-zone EEW.
Development of a deep-learning phase picker specifically designed for submarine DAS data.
Release of the open ABYSS offshore Chile DAS dataset covering ~450 km of submarine cables. It is the first long-term open submarine DAS dataset from a subduction zone.
Development of an automated earthquake catalog pipeline using the ABYSS offshore DAS network. The catalog reveals offshore microseismicity undetected by land-based networks.
A new method to reconstruct the 3D geometry of submarine cables using ambient acoustic noise. The approach improves the accuracy of offshore earthquake locations.
Development of Xdas, an open-source Python framework dedicated to DAS data processing. The software enables scalable workflows for large continuous datasets.
Systematic analysis of DAS dynamic range limitations for earthquake early warning applications. The study provides practical guidelines for optimizing DAS acquisition settings.
Imaging of offshore Chile sediment structures using surface waves and PS conversions. The method provides high-resolution sediment characterization along the margin.
Development of a DAS-adapted back-projection method for offshore earthquake rupture imaging. The work demonstrates the potential of DAS for rapid rupture characterization.
Demonstration that DAS can operate on active telecom submarine cables without disrupting traffic. This result enables large-scale geophysical monitoring using existing cable infrastructure.
Earthquake source parameters are extracted directly from raw DAS strain-rate data. The study demonstrates DAS as a standalone tool for source characterization.
Development of a method to correct sediment effects in offshore DAS observations. The approach significantly improves earthquake location accuracy.
First demonstration of submarine DAS for earthquake early warning in Chile. DAS-based magnitude estimates are comparable to those obtained from conventional seismometers.
Detection of a magnitude 4.8 earthquake located 150km south west of the GTD fiber optic cable. P-, S- and surface waves are clearly visible along more than 130km of the cable. Here the 32500 "virtual" sensors
The experiment to detect earthquakes on the coast of central Chile began on October 27, when the DAS device was connected to the Concón node of the Prat cable. This device will be connected until the end of November, and has already been able to record some earthquakes.
POST project for submarine monitoring of earthquake in central Chile - PI D. Rivet
POST project for submarine monitoring of earthquake in central Chile - PI D. Rivet
Submarine fiber optic cable already records earthquake data in Chile -
Submarine fiber optic cable already records earthquake data in Chile -
The Underwater Earthquake Observation Project (POST), led by Diane Rivet from the French laboratory Géoazur, in collaboration with the National Seismological Center, has already started the first stage of experimentation by using one of the strands of GTD's Prat fiber optic cable as seismic sensors.
Seminar about POST project at the Chiliean Sismogical National Center (CSN)
Page updated
Google Sites
Report abuse