Teleseisms monitoring using chirped-pulse φOTDR

Monitoring of seismic activity around the word is a topic of high interest for the analysis and understanding of deep Earth dynamics. However, the deployment of a homogeneous network of seismic stations both onshore and offshore poses a strong economic challenge that makes this solution practically inviable. Using the pre-existing fiber optical network for seismic monitoring arises as an excellent solution with important advantages in terms of ubiquity and cost. In this communication, we present the detection of an M8.2 earthquake occurred in Fiji Island using distributed acoustic sensing based on chirped-pulse φOTDR. Two sensors were placed simultaneously at two different locations at >9,000 km from the earthquake epicenter: a metropolitan area and a submarine environment. The recorded data is postprocessed using a 2D linear filter to cancel out environmental noise. The resulting signals are compared with the signals acquired by nearby seismometers. The attained good matching between the recorded data and the seismometer data shows the strong potential of the use of the already-deployed communication fiber network for teleseism monitoring

Teleseisms monitoring using chirped-pulse φOTDR

Monitoring of seismic activity around the word is a topic of high interest for the analysis and understanding of deep Earth dynamics. However, the deployment of a homogeneous network of seismic stations both onshore and offshore poses a strong economic challenge that makes this solution practically inviable. Using the pre-existing fiber optical network for seismic monitoring arises as an excellent solution with important advantages in terms of ubiquity and cost. In this communication, we present the detection of an M8.2 earthquake occurred in Fiji Island using distributed acoustic sensing based on chirped-pulse φOTDR. Two sensors were placed simultaneously at two different locations at >9,000 km from the earthquake epicenter: a metropolitan area and a submarine environment. The recorded data is postprocessed using a 2D linear filter to cancel out environmental noise. The resulting signals are compared with the signals acquired by nearby seismometers. The attained good matching between the recorded data and the seismometer data shows the strong potential of the use of the already-deployed communication fiber network for teleseism monitoring

Belgium Distributed Acoustic Sensing Array Raw Data

This file contains 1 hr of raw strain data from the Belgium Distributed Acoustic Sensing Array acquired on August 19, 2018 including the principle body wave phases from the M8.2 Fiji deep earthquake of the same date. The data is provided in a Matlab format (.mat) binary data file, which contains a data block (channels x time samples) and some header information. For more information on reading and interpreting the data in this file, please contact the authors (email: [email protected])

Les jeunes et le travail

L'Institut régional du travail d'Aix-en-Provence et le LEST-CNRS (UMR 6123), avec la collaboration du Pôle régional TRavail PACA et du Réseau national des Instituts du Travail, organisent un colloque interdisciplinaire sur le thème "Les jeunes et le travail", les 4 et 5 octobre 2012 à Marseille. L'objet de ce colloque est d'éclairer la question du rapport au travail des jeunes. Il poursuit un double objectif : réunir et mettre en dialogue les éclairages diversifiés que peuvent produire les di..