Search Results - "Helmstetter, A"

Detection and characterization of transient forcing episodes affecting earthquake activity in the Aleutian Arc system by Reverso, T., Marsan, D., Helmstetter, A.

“…Crustal, slow deformation transients can be caused by fluid or magmatic intrusions, and by slow slip on faults. They can affect earthquake dynamics, if they…”
Get full text

Assessing the reliability of local earthquake tomography for crustal imaging: 30 yr of records in the Western Alps as a case study by Virieux, J, Paul, A, Langlais, M, Janex, G, Guéguen, P, Helmstetter, A, Stehly, L

“…SUMMARY Local earthquake tomography (LET) is a popular method for inverting arrival time picks of local-regional earthquakes for P- and S-wave velocities and…”
Get full text

How variable is the number of triggered aftershocks? by Marsan, D., Helmstetter, A.

“…Aftershock activity depends at first order on the main shock magnitude but also shows important fluctuations between shocks of equal magnitude. We here…”
Get full text

Background seismicity in Boso Peninsula, Japan: Long‐term acceleration, and relationship with slow slip events by Reverso, T., Marsan, D., Helmstetter, A., Enescu, B.

“…Slow slip events (SSEs) in subduction zones can trigger earthquake swarms, especially at shallow depth. The monitoring of seismicity rates has therefore the…”
Get full text

Slow slip and aseismic deformation episodes associated with the subducting Pacific plate offshore Japan, revealed by changes in seismicity by Marsan, D., Reverso, T., Helmstetter, A., Enescu, B.

“…Aseismic phenomena, including slow slip, can alter the surrounding seismicity. We here investigate how seismicity can be used in order to reveal episodes of…”
Get full text

Foreshock activity related to enhanced aftershock production by Marsan, D., Helmstetter, A., Bouchon, M., Dublanchet, P.

“…Foreshock activity sometimes precedes the occurrence of large earthquakes, but the nature of this seismicity is still debated, and whether it marks transient…”
Get full text

Predator‐specific mortality of sage‐grouse nests based on predator DNA on eggshells by Helmstetter, Nolan A., Conway, Courtney J., Roberts, Shane, Adams, Jennifer R., Makela, Paul D., Waits, Lisette P.

“…Greater sage‐grouse (hereafter sage‐grouse; Centrocercus urophasianus) populations have declined across their range. Increased nest predation as a result of…”
Get full text

Automatic approach for increasing the location accuracy of slow-moving landslide endogenous seismicity: the APOLoc method by Provost, F, Malet, J-P, Gance, J, Helmstetter, A, Doubre, C

“…Seismological observations offer valuable insights on the stress-strain states, the physical mechanisms and the possible precursory signs of activation of…”
Get full text

Monitoring of snow avalanches using a seismic array: Location, speed estimation, and relationships to meteorological variables by Lacroix, P., Grasso, J.-R., Roulle, J., Giraud, G., Goetz, D., Morin, S., Helmstetter, A.

“…Monitoring snow avalanches is necessary in order to better understand their triggering mechanisms and ultimately improve forecast performance. Seismic…”
Get full text

Characterization and comparison of landslide triggering in different tectonic and climatic settings by Tatard, L., Grasso, J. R., Helmstetter, A., Garambois, S.

“…The spatial and temporal distributions of landslides in six catalogues are analyzed in order to better understand landslide triggering mechanisms. The six…”
Get full text

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…”
Get full text

Seismic Analysis of the Detachment and Impact Phases of a Rockfall and Application for Estimating Rockfall Volume and Free‐Fall Height by Le Roy, G., Helmstetter, A., Amitrano, D., Guyoton, F., Le Roux‐Mallouf, R.

“…We analyzed 21 rockfalls that occurred in limestone cliffs of the Chartreuse Massif (French Alps). These rockfalls were detected both by Terrestrial Laser…”
Get full text

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…”
Get full text

Is earthquake triggering driven by small earthquakes? by Helmstetter, Agnès

“…Using a catalog of seismicity for Southern California, we measure how the number of triggered earthquakes increases with the earthquake magnitude. The…”
Get full text

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…”
Get full text

Changes in effective stress during the 2003-2004 Ubaye seismic swarm, France by Daniel, G., Prono, E., Renard, F., Thouvenot, F., Hainzl, S., Marsan, D., Helmstetter, A., Traversa, P., Got, J. L., Jenatton, L., Guiguet, R.

“…We study changes in effective stress (normal stress minus pore pressure) that occurred in the French Alps during the 2003–2004 Ubaye earthquake swarm. Two…”
Get full text

Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011) by Bottelin, P, Jongmans, D, Daudon, D, Mathy, A, Helmstetter, A, Bonilla-Sierra, V, Cadet, H, Amitrano, D, Richefeu, V, Lorier, L

“…The eastern limestone cliff of Mount Néron (French Alps) was the theater for two medium-size rockfalls between summer and winter 2011. On 14 August 2011, a…”
Get full text

Occurrence of finite-time singularities in epidemic models of rupture, earthquakes, and starquakes by Sornette, D, Helmstetter, A

“…We present a new kind of critical stochastic finite-time singularity, relying on the interplay between long-memory and extreme fluctuations. We illustrate it…”
Get full text

Creep ruptures in heterogeneous materials by Nechad, H, Helmstetter, A, El Guerjouma, R, Sornette, D

“…We present creep experiments on fiber composite materials with different controlled heterogeneity. All samples exhibit a power-law relaxation of the strain…”
Get full text

Slider block friction model for landslides: Application to Vaiont and La Clapière landslides by Helmstetter, A., Sornette, D., Grasso, J.-R., Andersen, J. V., Gluzman, S., Pisarenko, V.

“…Accelerating displacements preceding some catastrophic landslides have been found to display a finite time singularity of the velocity v ∼1/(tc − t) [Voight,…”
Get full text