RÉSIF-SI: A Distributed Information System for French Seismological Data

Péquegnat, Catherine; Schaeffer, Jonathan; Satriano, Claudio; Pedersen, Helle A.; Touvier, Jérôme; Calvet, Marie; Stehly, Laurent; Arnoul, Patrick; Bollard, Philippe; Dewée, Olivier; Engels, Fabien; Grunberg, Marc; Pardo, Constanza; Wolyniec, David; Arneodo, Grégory; Bouazzouz, Rima; Geber, Olivier; Aubert, Coralie; Langlais, Mickaël; Roussel, Sandrine; Brenguier, Florent; Crawford, Wayne; Lemarchand, Arnaud; Olivier, Serge; Rivet, Diane; Vallée, Martin; Vergne, J.; Chèze, Jérôme; Debayle, E.; Delouis, Bertrand; Guéguen, Philippe; Lambotte, Sophie; Mocquet, A.; Ambert, Paul; Peix, Fabrice; Schindelé, François; Shapiro, N. M.; Stutzmann, E.; Volcke, Pierre; Walpersdorf, Andréa

doi:10.1785/0220200392

Cited by 10 publications

(5 citation statements)

References 48 publications

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“…Over this period, accelerometric stations from the national strong motion networks [Péquegnat et al, 2008, FDSN code: RA;RESIF-RAP, 1995] were gradually added to the SISmalp regional network. At the beginning of 2010, at the initiative of the ISTerre-OSUG team, the upgrading of the network was launched, the first step of the Résif-Epos project (Réseau sismologique et géodésique français-French seismological and geodetical network; FDSN code: FR; RESIF-RLBP, 1995) with the objective of bringing together in a research infrastructure all the national and regional networks (such as SISmalp) and mobile station pool in France [Péquegnat et al, 2021]. Over this period, efforts have focused both on the upgrading of recording sites, related to the quality of the site [Langlais et al, 2013] and the real time and continuous data management through seedlink protocols, and the use of Seiscomp3 software [Weber et al, 2007] for the processing and automatic detection of earthquakes.…”

Section: Operational Monitoring Of the Seismic Sequence Of The Maurienne Swarmmentioning

confidence: 99%

Unprecedented seismic swarm in the Maurienne valley (2017–2019) observed by the SISmalp Alpine seismic network: operational monitoring and management

Guéguen¹,

Janex²,

Nomade³

et al. 2022

Comptes Rendus. Géoscience

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In 2017-2019, a seismic swarm was triggered in the Maurienne valley (French Alps), with more than 5000 events detected by the regional SISmalp network. The population, who asked SISmalp to provide information on the processes and the associated risk, felt many earthquakes. In a post-L'Aquila trial context, we conducted a reflection on the scientific and social operational management of the crisis. The geological and tectonic analysis, the deployment of a temporary seismic network, an automatic double-difference relocation procedure (HypoDD) after clustering earthquakes, as well as the interactions with the population and the risk managers, have been carried out jointly. The length and unpredictability of the sequence complicated crisis management and the relations between local authorities and civil protection. The involvement of SISmalp, beyond its main scientific and observation prerogatives, has contributed to moderate the fears of the population by providing scientific explanations.

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Section: Operational Monitoring Of the Seismic Sequence Of The Maurienne Swarmmentioning

confidence: 99%

Unprecedented seismic swarm in the Maurienne valley (2017–2019) observed by the SISmalp Alpine seismic network: operational monitoring and management

Guéguen¹,

Janex²,

Nomade³

et al. 2022

Comptes Rendus. Géoscience

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“…Data are managed at the Résif‐data center hosted at ISTerre (Guéguen et al., 2017; RESIF, 1995; Sismob, 2021). Résif‐Epos (Péquegnat et al., 2021) is a national Research Infrastructure, recognized as such by the French Ministry of Higher Education and Research. Résif‐Epos is managed by the Résif‐Epos Consortium, composed of 18 Research Institutions and Universities in France.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Data are managed at the Résif-data center hosted at ISTerre (Guéguen et al, 2017;RESIF, 1995;Sismob, 2021). Résif-Epos (Péquegnat et al, 2021)…”

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confidence: 99%

Analysis of the Spatiotemporal Evolution of the Maurienne Swarm (French Alps) Based on Earthquake Clustering

Minetto

Helmstetter

Schwartz

et al. 2022

Earth and Space Science

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A seismic swarm is generally defined as a seismic sequence with no clear dominant earthquake (mainshock) (Mogi, 1963). Seismic swarms also do not have a clear onset, and the number of events do not decrease with time according to the Omori law (Utsu, 1957) as observed in classical mainshock-aftershock sequences. This suggests that stress triggering (Stein, 1999) alone cannot explain the genesis of seismic swarms. Seismic swarms are observed in many geological environments, such as volcanic and hydrothermal regions (Hill, 1977), oceanic ridges (Sykes, 1970), pure tectonic regions (e.g., Špičák, 2000), and also during hydraulic stimulations (Healy et al., 1968).Fluids are commonly cited as one of the driving sources of seismic swarms. Pore fluid pressure would indeed lower the effective stress, thus promoting rupture (Hubbert & Rubey, 1959). This is supported by experiments during fluid injections (e.g., Ohtake, 1974;Raleigh et al., 1976), and by the observation of changes in groundwater level and surface discharge during seismic activity (Kisslinger, 1975). In instances of natural swarms where no subsurface effects are evident, a migration of seismicity compatible with fluid diffusion is the main indicator of the presence of fluids (e.g., Chen et al., 2012;Shelly et al., 2013).Aseismic slip is another proposed triggering mechanism of swarms, which is commonly inferred by comparing geodetic and seismological observations (Lohman & McGuire, 2007;Ozawa et al., 2007). Swarms caused by aseismic slip have a higher migration velocity (km/h) (Lohman & McGuire, 2007;Roland & McGuire, 2009) compared to seismic swarms caused by fluids (m/day) (Shapiro et al., 1997). The periodic occurrence of identical events called repeaters is also thought to be evidence of aseismic slip (e.g., Nadeau et al., 1995), but it has been shown that repeaters are also possible during fluid diffusion (Deichmann et al., 2014). Fluid diffusion and aseismic slip may also coexist (e.g., Bourouis & Bernard, 2007;De Barros et al., 2020;Hatch et al., 2020), and earthquake-earthquake interactions may also play a role in the migration (e.g., Fischer & Hainzl, 2021). Even though several triggering mechanisms have been proposed, it remains a challenge to identify the driving processes of a swarm and to explain the reason why a swarm has a specific migration velocity, propagation direction, and duration.The lack of understanding of why seismic swarms occur does not only derive from the complexity of the processes, but also from specific difficulties inherent to these seismic sequences. Studying the spatiotemporal evolution of swarms requires high-resolution locations and high detection rates, usually obtained with template matching

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“…The Résif-EPOS (French permanent seismological network) data centre gathers the whole regional seismological dataset into a homogeneous archive and provides access to the data through FDSN web services (Péquegnat et al, 2021). The seismological data and metadata from this survey are therefore freely available through the Résif-EPOS portal (https://ws.resif.fr/last accessed January 02, 2022; network 3C -http://dx.doi.org/10.15778/RESIF.3C2019).…”

Section: Data and Resourcesmentioning

confidence: 99%

Postseismic Survey of a Historic Masonry Tower and Monitoring of Its Dynamic Behavior in the Aftermath of Le Teil Earthquake (Ardèche, France)

Combey

Mercerat²,

Guéguen

et al. 2022

Bulletin of the Seismological Society of America

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On 11 November 2019, an Mw 4.9 earthquake struck the middle Rhône valley (South-East France) producing moderate to severe damage in the town of Le Teil and its surroundings. This unexpected event stressed the vulnerability of the French cultural built heritage to a moderate seismic hazard. Commonly applied to modern civil engineering structures, passive seismic methods are still lacking on historic constructions to understand properly the different factors driving their dynamic behavior. In this article, the results of a two-month seismic monitoring survey carried out shortly after the Le Teil mainshock in a historic masonry tower are presented and discussed. Located only 5 km south of the epicenter, the Gate Tower of Viviers (eleventh century) was instrumented with four highly sensitive seismic nodes. Ambient vibrations, as well as aftershocks and quarry blasts from the nearby Le Teil quarry, were recorded and used in the analysis. Through vibration-based analysis, the article addresses three relevant aspects of the dynamic response of ancient masonry structures. We discuss first the differences in the building’s response induced by the three reported types of vibrations, focusing on the particular signal characteristics of shallow aftershocks and quarry blasts. Then, we apply the Random Decrement Technique (RDT) to track the dynamic behavior variations over two months and to discuss the role of the environmental conditions in the slight fluctuations of the structural modal parameters (natural frequencies, damping coefficients) of unreinforced masonry structures. We also show evidence of the nonlinear elastic behavior under both weak seismic and atmospheric loadings. The correlation between the presence of heterogeneities in the construction materials and the nonlinear threshold supports the relevance of such types of monitoring surveys as a valuable tool for future modeling works and conservation efforts.

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RÉSIF-SI: A Distributed Information System for French Seismological Data

Cited by 10 publications

References 48 publications

Unprecedented seismic swarm in the Maurienne valley (2017–2019) observed by the SISmalp Alpine seismic network: operational monitoring and management

Unprecedented seismic swarm in the Maurienne valley (2017–2019) observed by the SISmalp Alpine seismic network: operational monitoring and management

Analysis of the Spatiotemporal Evolution of the Maurienne Swarm (French Alps) Based on Earthquake Clustering

Postseismic Survey of a Historic Masonry Tower and Monitoring of Its Dynamic Behavior in the Aftermath of Le Teil Earthquake (Ardèche, France)

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