A5026050814- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological and Tectonic Studies in Latin America
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Landslides and related hazards
- Earthquake Detection and Analysis
- Environmental and Cultural Studies in Latin America and Beyond
- Geological and Geophysical Studies Worldwide
- Cryospheric studies and observations
- Seismology and Earthquake Studies
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Geological and Geophysical Studies
- Geography and Education Methods
- Seismic Waves and Analysis
- Tree-ring climate responses
- Mediterranean and Iberian flora and fauna
- Climate variability and models
- Botany and Geology in Latin America and Caribbean
- Disaster Management and Resilience
- Social Sciences and Policies
- Environmental and Ecological Studies
- Multiculturalism, Politics, Migration, Gender
Laboratoire Magmas et Volcans
2016-2025
Institut de Recherche pour le Développement
2012-2024
Mines Saint-Étienne
2024
Université Clermont Auvergne
2011-2024
Centre National de la Recherche Scientifique
2012-2024
Instituto Geofísico de la Escuela Politécnica Nacional
2008-2024
Weatherford College
2024
Laboratoire de Mathématiques
2024
Istituto Nazionale di Geofisica e Vulcanologia
2024
INGV Sezione di Pisa
2024
Abstract Previous studies of the Ecuadorian arc (1°N–2°S) have revealed across‐arc geochemical trends that are consistent with a decrease in mantle melting and slab dehydration away from trench. The aim this work is to evaluate how these processes vary along response small‐scale changes age subducted plate, subduction angle, continental crustal basement. We use an extensive database 1437 samples containing 71 new analyses, major trace elements as well Sr‐Nd‐Pb isotopes South Colombian...
In the Northern Volcanic Zone of Andes, Cayambe Complex consists of: (1) a basal, mostly effusive volcano, Viejo Cayambe, whose lavas (andesites and subordinate dacites rhyolites) are typically calc-alkaline; (2) younger, essentially dacitic, composite edifice, Nevado characterized by with adakitic signatures explosive eruptive styles. The construction began >1·1 Myr ago ended at ∼1·0 Ma. young still active grew after period quiescence about 0·6 Myr, from ∼0·4 Ma to Holocene. Its complex...
Abstract. To better characterize the climate variability of last millennium in high Andes, we analyzed pollen content a 1150-yr-old sediment core collected bog located at 3800 m a.s.l. páramo eastern Cordillera Ecuador. An upslope convective index based on ratio between cloud transported from Andean forest to (T) and Poaceae frequencies, related edaphic moisture (P), was defined. This used distinguish changes atmospheric soil their associated patterns interdecadal El Niño–Southern...
Abstract Tephra fallout hazard assessment is undertaken with probabilistic maps that rely on numerical models. Regarding production, the input parameters of model (including atmospheric conditions), physical approximations simulations, and probabilities occurrence different eruption types in specific time frames are among most critical sources uncertainty. We therefore present a tephra study for two active volcanoes (Cotopaxi Guagua Pichincha) Ecuador. utilize PLUME‐MoM/HYSPLIT models,...
Abstract Sangay volcano (Ecuador) shows a quasi-continuous activity at least since the seventeenth century and has produced several eruptions which affected towns cities considerable distance (up to > 170 km). For this reason, despite its remote location, recent efforts were aimed reviewing volcanic history, quantifying occurrence probability of four eruptive scenarios different magnitude (Strong Ash Venting, Violent Strombolian, sub-Plinian, Plinian) associated uncertainty, and, for each...
Volcanic systems behave episodically and require mechanisms for magma segregation, instability ascent. Here, we discuss the processes that promote ascent of to Earth's surface prepare onset an eruption, thus acting as triggers, well factors prevent eruption. We describe various petrological, geochemical geophysical observations reveal triggering events. Based on emerging concepts plumbing systems, consider involved, buoyancy overpressure magmas associated fluids, using modelling approaches....
Abstract Through integration of multiple data streams to monitor volcanic unrest scientists are able make more robust eruption forecast and obtain a holistic interpretation systems. We examined gas emission geochemistry seismic petrologic recorded during the 2015 Cotopaxi (Ecuador) in order decipher origin temporal evolution this eruption. Identification families similar events use amplitude ratios reveals changes processes. SO 2 (300 24,000 t/d), BrO/SO (5–10 × 10 −5 ), /HCl (5.8 ± 4.8 6.6...
Research Article| November 01, 2002 Transition from calc-alkalic to adakitic magmatism at Cayambe volcano, Ecuador: Insights into slab melts and mantle wedge interactions Pablo Samaniego; Samaniego 1Departamento de Geofísica, Escuela Politécnica Nacional, Ap. 17-01-2759, Quito, Ecuador, Laboratoire Magmas et Volcans, Université Blaise Pascal Institut Recherche pour le Développement, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar...
Understanding the plumbing system structure below volcanoes and storage conditions (temperature, pressure, volatile content oxygen fugacity) of erupted magmas is paramount importance for eruption forecasting understanding factors controlling eruptive dynamics. Phase equilibria experiments have been performed on a Tungurahua andesite (Ecuador) to shed light magmatic that led July–August 2006 eruptions parameters controlled Crystallization were representative August mafic product between 950...