Search Results - "Helmstetter, Agnès"

Repeating Low Frequency Icequakes in the Mont‐Blanc Massif Triggered by Snowfalls by Helmstetter, Agnès

“…Deformation mechanisms of glaciers are highly sensitive to basal temperature; the motion of temperate glaciers is dominated by basal slip while cold‐based…”
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Seismic monitoring of Séchilienne rockslide (French Alps): Analysis of seismic signals and their correlation with rainfalls by Helmstetter, Agnès, Garambois, Stéphane

“…In the French Alps, Séchilienne rockslide is one of the natural phenomena that presents one of the highest levels of risk in terms of socioeconomical outcomes…”
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Afterslip and aftershocks in the rate-and-state friction law by Helmstetter, Agnès, Shaw, Bruce E.

“…We study how a stress perturbation generated by a main shock affects a fault obeying the rate‐state friction law using a simple slider block system. Depending…”
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Brittle creep, damage, and time to failure in rocks by Amitrano, David, Helmstetter, Agnès

“…We propose a numerical model based on static fatigue laws in order to model the time‐dependent damage and deformation of rocks under creep. An empirical…”
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Earthquake risk in reinforced concrete buildings during aftershock sequences based on period elongation and operational earthquake forecasting by Trevlopoulos, Konstantinos, Guéguen, Philippe, Helmstetter, Agnès, Cotton, Fabrice

“…•Time-variant seismic risk of reinforced concrete buildings for mainshock scenarios.•Synthetic sequences generated with the Epidemic Type Aftershock Sequence…”
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Subcritical and supercritical regimes in epidemic models of earthquake aftershocks by Helmstetter, Agnès, Sornette, Didier

“…We present an analytical solution and numerical tests of the epidemic‐type aftershock (ETAS) model for aftershocks, which describes foreshocks, aftershocks,…”
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Foreshocks explained by cascades of triggered seismicity by Helmstetter, Agnès, Sornette, Didier

“…The observation of foreshocks preceding large earthquakes and the suggestion that foreshocks have specific properties that may be used to distinguish them from…”
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Seismic monitoring in the Gugla rock glacier (Switzerland): ambient noise correlation, microseismicity and modelling by Guillemot, Antoine, Helmstetter, Agnès, Larose, Éric, Baillet, Laurent, Garambois, Stéphane, Mayoraz, Raphaël, Delaloye, Reynald

“…SUMMARY A network of seismometers has been installed on the Gugla rock glacier since October 2015 to estimate seismic velocity changes and detect…”
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Timing, volume and precursory indicators of rock‐ and cliff fall on a permafrost mountain ridge (Mattertal, Switzerland) by Hendrickx, Hanne, Le Roy, Gaëlle, Helmstetter, Agnès, Pointner, Eric, Larose, Eric, Braillard, Luc, Nyssen, Jan, Delaloye, Reynald, Frankl, Amaury

“…High mountain environments are increasingly affected by rockfall‐related hazards, driven by climate change. Studying rockfall in these environments is,…”
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Multi-method investigation of mass transfer mechanisms in a retrogressive clayey landslide (Harmalière, French Alps) by Fiolleau, Sylvain, Jongmans, Denis, Bièvre, Gregory, Chambon, Guillaume, Lacroix, Pascal, Helmstetter, Agnès, Wathelet, Marc, Demierre, Michel

“…The mass transfer mechanisms in landslides are complex to monitor because of their suddenness and spatial coverage. The active clayey Harmalière landslide,…”
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Relation between stress heterogeneity and aftershock rate in the rate-and-state model by Helmstetter, Agnès, Shaw, Bruce E.

“…We estimate the rate of aftershocks triggered by a heterogeneous stress change, using the rate‐and‐state model of Dieterich. We show that an exponential stress…”
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Importance of small earthquakes for stress transfers and earthquake triggering by Helmstetter, Agnès, Kagan, Yan Y., Jackson, David D.

“…We estimate the relative importance of small and large earthquakes for static stress changes and for earthquake triggering, assuming that earthquakes are…”
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Basal icequakes recorded beneath an Alpine glacier (Glacier d'Argentière, Mont Blanc, France): Evidence for stick-slip motion? by Helmstetter, Agnès, Nicolas, Barbara, Comon, Pierre, Gay, Michel

“…While basal icequakes associated with glacier motion have been detected under Antarctica for several decades, there remains very little evidence of stick‐slip…”
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Fluid‐Induced Swarms and Coseismic Stress Transfer: A Dual Process Highlighted in the Aftershock Sequence of the 7 April 2014 Earthquake (Ml 4.8, Ubaye, France) by De Barros, Louis, Baques, Marion, Godano, Maxime, Helmstetter, Agnès, Deschamps, Anne, Larroque, Christophe, Courboulex, Francoise

“…The upper part of the Ubaye Valley (French Alps) is characterized by alternating mainshock‐aftershock sequences and swarms. Particularly, during the 2012–2015…”
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Testing probabilistic seismic hazard estimates against accelerometric data in two countries: France and Turkey by Tasan, Hilal, Beauval, Céline, Helmstetter, Agnès, Sandikkaya, Abdullah, Guéguen, Philippe

“…Probabilistic seismic hazard models (PSHM) are used for quantifying the seismic hazard at a site or a grid of sites. In this study, a methodology is proposed…”
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Båth's law derived from the Gutenberg-Richter law and from aftershock properties by Helmstetter, Agnès, Sornette, Didier

“…The empirical Båth's law states that the average difference in magnitude between a mainshock and its largest aftershock is 1.2, regardless of the mainshock…”
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Seismic monitoring of soft-rock landslides: the Super-Sauze and Valoria case studies by Tonnellier, Alice, Helmstetter, Agnès, Malet, Jean-Philippe, Schmittbuhl, Jean, Corsini, Alessandro, Joswig, Manfred

“…This work focuses on the characterization of seismic sources observed in clay-shale landslides. Two landslides are considered: Super-Sauze (France) and Valoria…”
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Unprecedented seismic swarm in the Maurienne valley (2017–2019) observed by the SISmalp Alpine seismic network: operational monitoring and management by Guéguen, Philippe, Janex, Gael, Nomade, Jérôme, Langlais, Mickael, Helmstetter, Agnès, Coutant, Olivier, Schwartz, Stéphane, Dollet, Cyrielle

“…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…”
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Analysis of the Spatiotemporal Evolution of the Maurienne Swarm (French Alps) Based on Earthquake Clustering by Minetto, Riccardo, Helmstetter, Agnès, Schwartz, Stéphane, Langlais, Mickaël, Nomade, Jérôme, Guéguen, Philippe

“…Between August 2017 and March 2019, an intense seismic swarm was recorded in the Maurienne valley in the north of the Belledonne massif (Western French Alps)…”
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Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling by Guillemot, Antoine, Baillet, Laurent, Garambois, Stéphane, Bodin, Xavier, Helmstetter, Agnès, Mayoraz, Raphaël, Larose, Eric

“…Among mountainous permafrost landforms, rock glaciers are mostly abundant in periglacial areas, as tongue-shaped heterogeneous bodies. Passive seismic…”
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