andrea di muro, nicolas villeneuve ... - univ-reunion.fr · 12/4/2015 · - gas – solid...
TRANSCRIPT
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PROJET ANR « STRAP »SYNERGIE TRANSDISCIPLINAIRE POUR REPONDRE AUX ALEAS LIES AUX PANACHES VOLCANIQUES
WORKPACKAGE 2 – CONVECTIVE PLUMES: FLUXES, DYNAMICS AND MODELLING
STRAP Meeting, Saint Denis, December 4, 2015
Andrea DI MURO, Nicolas VILLENEUVE & OVPF teamObservatoire Volcanologique du Piton de la Fournaise (OVPF)
Institut de Physique du Globe de Paris (IPGP)
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SOURCE CONDITIONS
WP2B Gas and aerosol budget from small size volcanic plumes(A. Di MURO, S. MOUNE, A. HARRIS, N. VILLENEUVE)
B2. Source magma volatile budget (composition, fluxes) and pre-eruptive concentration –link with time evolution of eruptive activity (IPGP / OPGC)
B3. Near-vent gas and aerosol budgets (insight on sulfur excess problem) (OPGC/IPGP)
Milestones (2015)
A. 1 Eruption in 2014 (June); 4 eruptions in 2015 (February; May; July; August)
B. Source data collection- 110 solid samples (55.3 kg)
- 22 near-field MultiGaS measurements- Permanent and portable DOAS + MultiGaS data acquisition/treatment
- Analysis of June 2014 melt inclusions-OMI SO2 satellite data
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MAIN OBJECTIVE: REDUCE UNCERTAINTIES IN SOURCE TERMS- MASS DISCHARGE RATE- HEAT FLUX- GAS COMPOSITION- GAS – SOLID PARTITION- PLUME HEIGHT
METHOD: REAL – TIME OBSERVATIONS AT THE MICROSCALE OF DILUTE PLUMES.INTEGRATION WITH THERMODYNAMIC MODELS OF MAGMA ASCENTAND DEGASSING.
MICROSCALE OBSERVATIONS (< 2 km)
MICROSCALE α−β : SO2 OPTICAL DEPTH (DOAS; PERMANENT AND PORTABLE)PLUME HEIGHT (DOAS NETWORK)IR
MICROSCALE γ : GAS SAMPLING (MULTIGAS)SOLID SAMPLING (LAVA; PYROCLAST)IR
MAGMA ASCENT AND DEGASSING CONSTRAINED BY MINERAL, MELT AND FLUIDINCLUSION DATA
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Start End Duration(days)
Duration seismic crisis (min)
Where Volume (Mm3)
20/06/2014 – 21H35 21/06/2014 – 17H09 0.8 76 / 75 SSE (3F / 1C) 0.4
04/02/2015 – 06H50 15/02/2015 -18H30 11.46 100 / WSW (3F / 2C) 3
17/05/2015 – 09H45 30/05/2015 – 16H50 12.70 155 / 45 S& SE (4 + 3F / 2C)
8
31/07/2015 – 05H45 02/08/2015 – 7H15 2.06 90 / 80 NNE (3 F /1 C) 4
24/08/2015 – 14H50 31/10/2015 – 12h20 69 100 / 41 SSW + W (4 F/ 3C) > 50
SOURCE CONDITIONS (MAGMA FLUXES)
Courtesy of D. Coppola (MIROVA)
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2B.2 SOURCE VOLATILE BUDGET; SOLID SAMPLES
SAMPLES:- HIGH TEMPERATURE LAVA (WATER QUENCHED)- MID-LOW TEMPERATURE LAVA (NO WATER QUENCHING)
- BOMBS (WATER QUENCHED)- BOMBS (NO WATER QUENCHING)- PYROCLASTS (ON FABRIC BLANKET)
PRELIMINARY RESULTS POINT TO :A) HOMOGENEOUS MAGMA (FEBRUARY, JULY)B) HETEROGENEOUS MAGMA (JUNE, MAI, AUGUST)
C) INVOLVEMENT OF VARIABLY DEGASSED (FACTOR 2.8) SHALLOW MAGMAS (
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2B.3 NEAR FIELD GAS MEASUREMENTS (DOAS)
4.3 asl
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OMI SO2 dataset (http://so2.gsfc.nasa.gov)
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PORTABLE MULTIGAS (RH, P, T, CO2, H2S, SO2)
GROUND BASEDHELICOPTER
DRONECOUNTS: MAX 1 h ca; 0,1 Hz
- DENSE PLUME FROM THE VENT
- DILUTED PLUME FROM THE VENT
- LAVA TUNNEL EMISSIONS
- DILUTED PLUME FROM THE LAVA
- HIGH TEMPERATURE FUMAROLES
- LOW TEMPERATURE FUMAROLES
COUPLING WITH SO2 FLUXES (DOAS) WILL PROVIDE H2O, CO2 AND POSSIBLY H2S FLUXES
2B.3 NEAR VENT GAS MEASUREMENTS
2016: Add halogen and trace metals output
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2B.2 M1 (C. BENDIMERAD – IPGP; TUTORS: A. DI MURO; N. METRICH)INITIAL AND RESIDUAL VOLATILE CONTENTS (PETROLOGICAL METHOD)STORAGE PRESSURE AND TEMPERATURE AND MAGMA DEGASSING
2B.3 M2 (R. SPALLANZANI - LMV; TUTORS: S. MOUNE; A. DI MURO)THERMODYNAMIC MODELING OF MAGMA DEGASSINGCORRELATION OF MULTIGAS AND GEOPHYSICAL DATASETS
« BACKGROUND DATASETS »MAGMA BULK COMPOSITION
CRYSTAL CONTENT AND COMPOSITIONPRODUCT TEXTURES (MICROLITES; VESICULARITY; CONNECTIVITY, DENSITY)
ERUPTION DURATIONTIME EVOLUTION OF EXPLOSIVE AND EFFUSIVE ACTIVITY
STEADINESS OF ERUPTIVE CONDITIONSLAVA OUTPUT RATE
TOTAL VOLUME OF ERUPTIVE PRODUCTS (CONE; LAVA)
TIME EVOLUTION OF GEOPHYSICAL SIGNALSSEISMIC HYPOCENTERS
SEISMIC SIGNAL INTENSITY AND FREQUENCY DISTRIBUTIONINFLATION – DEFLATION CYCLES
DATA TREATMENT
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EGU 2016
Abstract deadlines: January 13, 2016
GMPV – Geochemistry, Mineralogy, Petrology & Volcanology
GMPV5 – Magmatic and volcanic processes
GMPV5.2/NH2.7Magma ascent, degassing and eruptive dynamics: linking experiments, models and observations
Convener: Mattia de’ Michieli Vitturi | Co-Conveners: Andrea Di Muro , Mike Burton
GMPV6 – Volcano monitoring and recent eruptions
GMPV7 – Natural Hazards Produced by Volcanic Activity
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BILAN FINANCIER STRAP (IPGP – 20 keuros)
7 keuros – MultiGaS set - 209,50 euros (Anémomètre)
-M2 Moune-Di Muro 2016 MultiGaS (mission à l’OVPF – logement)
5 keuros – petrological and geochemical analysesMission ADM Paris/Lyon– geochemical analyses: 2464,21
-300 euros (EPMA Camparis)-Analyses M1 Di Muro - Métrich (2016)
2 keuros – thermometry--
6 keuros – scientific publication and meetingsMission E.Kaminski – Toulouse 450 euros