A5067817908- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Geology and Paleoclimatology Research
- GNSS positioning and interference
- Stochastic processes and statistical mechanics
- Gas Dynamics and Kinetic Theory
- Stochastic processes and financial applications
- Methane Hydrates and Related Phenomena
- Disaster Management and Resilience
- Theoretical and Computational Physics
- Coagulation and Flocculation Studies
- Blood donation and transfusion practices
- Geophysics and Sensor Technology
- Geological and Tectonic Studies in Latin America
- Geological and Geophysical Studies Worldwide
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Geological formations and processes
- Meteorological Phenomena and Simulations
GNS Science
2015-2025
Laboratoire de Probabilités et Modèles Aléatoires
2000-2025
Laboratoire de Probabilités, Statistique et Modélisation
2017-2025
Crown Research Institutes
2021-2022
Laboratoire d’Analyse et de Mathématiques Appliquées
2010-2016
University of the West Indies
2004-2014
Centre National de la Recherche Scientifique
2014
Institut de Recherche pour le Développement
2014
Université Clermont Auvergne
2014
Laboratoire Magmas et Volcans
2014
Abstract In November 2019, the fourth Volcano Observatory Best Practices workshop was held in Mexico City as a series of talks, discussions, and panels. Volcanologists from around world offered suggestions for ways to optimize volcano-observatory crisis operations. By crisis, we mean unrest that may or not lead eruption, eruption itself, its aftermath, all which require analysis communications by observatory. During priority observatory should be acquire, process, analyze, interpret data...
In this work we assess how volcano geodetic observations can be used to gain insights into hydrothermal system dynamics. We designed a range of numerical models unrest and associated ground deformation caused by the thermo–poro–elastic response substratum. Throughout an episode unrest, is consistently first controlled poroelastic substratum pore pressure increase near injection area. Later, thermal expansion may become dominant process if sustained. inverted these synthetic data using simple...
We collate nearly two decades of campaign GPS data gathered at over 900 sites throughout New Zealand to release a nationwide velocity field. The span the entire North and South islands with typical spacing 10–20 km denser network (c. 2–8 spacing) in Wellington region, central Taupo Volcanic Zone parts Arthur's Pass area. dataset provides most comprehensive-to-date view crustal deformation within Australia–Pacific plate boundary zone region. discuss acquisition, processing derivation...
Research Article| July 01, 2006 Submarine pyroclastic deposits formed at the Soufrière Hills volcano, Montserrat (1995–2003): What happens when flows enter ocean? J. Trofimovs; Trofimovs 1Department of Earth Sciences, University Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK Search for other works by this author on: GSW Google Scholar L. Amy; Amy G. Boudon; Boudon 2Institut de Physique du Globe Paris et Centre National la Recherche Scientifique (CNRS) Case 89, 4 Place...
Abstract The 300 km long Taupo Volcanic Zone (TVZ) formed as a result of back‐arc rifting associated with subduction the Pacific Plate beneath Australian Plate, current extension rates 8–15 mm yr −1 . Using GPS and interferometric synthetic aperture radar (InSAR) data, collected by European (ESA) Japanese (JAXA) space agencies, we present ground deformation observations from 2003 to 2011. Both InSAR vertical data show widespread subsidence across central TVZ at up 20 simple elastic...
Bayesian Networks (BNs) are probabilistic graphical models that provide a robust and flexible framework for understanding complex systems. Limited case studies have demonstrated the potential of BNs in modeling multiple data streams eruption forecasting volcanic hazard assessment. Nevertheless, not widely employed volcano observatories. Motivated by need to assess probability fatality when conducting field work, we worked closely with New Zealand monitoring team explore utility BNs. We...
Abstract Inelastic rheological behavior, such as viscoelasticity, is increasingly utilized in the modeling of volcanic ground deformation, elevated thermal regimes induced by magmatic systems may necessitate use a mechanical model containing component time‐dependent viscous behavior. For given amplitude and footprint incorporating viscoelastic regime has been shown to reduce magma reservoir overpressure requirements suggested elastic models. This phenomenon, however, restricted...
[1] We performed shear wave splitting analyses and calculated vP/vS-ratios on local earthquakes recorded at seven stations around Aso volcano, Japan, between 2001 2008. The mean vP/vS of 1.61 ± 0.01 from all is among the lowest average values found anywhere in world. A temporal change fast polarization observed one station. Additionally, spatial variations delay times show a correlation three stations. suggest that stress-controlled anisotropy dominates these GPS baselines 2D strain reveal...
During the Soufrière Hills eruption, vulcanian explosions have generally occurred 1) in episodic cycles; 2) isolated during pauses extrusion, and 3) after major collapses of dome. In a different eruptive context, significant on 29 July 2008, 3 December January 2009. Deposits are pumiceous except for event. We reconstructed dispersal pattern deposits their textural characteristics to evaluate erupted volume vesicularity magma at fragmentation. discuss implications these terms processes...
We prove a quantitative result of convergence conservative stochastic particle system to the solution homogeneous Landau equation for hard potentials. There are two main difficulties: (i) known stability results this class equations concern regular solutions and seem difficult extend study rate some empirical measures; (ii) conservativeness is an obstacle (approximate) independence. To overcome (i), we new potentials concerning very general measure solutions. Due (ii), have couple, our with...
The Boiling Lake of Dominica has exhibited stable high‐temperature behavior for at least 150 a. This stability is punctuated by occasional crises involving rapid filling and draining the lake changes in water temperature. most recent such crisis occurred December 2004 to April 2005. Using results previous theoretical experimental work on analogue models, we present a combined thermal, hydrological, fluid mechanical model Lake. reveals that appears be suspended above local table constant...
Abstract Volcanoes undergoing unrest often produce displacements at the ground surface, providing an important window to interpret dynamics of underlying magmatic system. The thermomechanical properties surrounding host rock are expected be highly heterogeneous, with key physical parameters having a strong dependence on temperature. Deformation models that incorporate nonelastic rheological behaviors therefore heavily reliant assumed thermal conditions, and so it is critical understand how...
We obtain estimates of the seismic velocity and attenuation for White Island volcano by use high‐impact sand‐bag drops from helicopter. Three were attempted, two at either end a 6‐station linear array within crater floor, third in volcano's lake. The bags dropped ∼310–380 m height contained ∼700 kg sand. impact was estimated ∼60–70 m/s yielding kinetic energy about 10 6 Nm, giving P ‐wave onsets to distance ∼1 km. obtained estimate Vp = 1.2 km/s unconsolidated floor 2.2 rays traversing...