Geophysical surveys Anomaly maps 2D modeling Discussion Conclusion
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2 Introduction Geophysical surveys Anomaly maps 2D modeling Discussion Conclusion General context Growth of volcanic domes is a multiphase process: extrusion phases 2005 lava dome growth inside the Mount St. Helens crater (modified from Major and al., 2005) volcanic explosions and dome collapses 2009 Soufrière Hills eruption Photo J. Stone Photo Photovolcanica 2014 Sinabung dome collapse 16/04/2015 Angélie Portal EGU General Assembly
3 General context intense hydrothermal and fumarolic activity F. BEAUDUCEL/IPGP 2010 Soufrière de Guadeloupe (2010) Photo CVGHM/ULB A. Bernard Kelud lava dome (2008) Photo CSVO Fuego de Colima (2001) Resulting inner structure is complex: massive lava parts, pyroclastic deposits and breccia, talus. Modified after Wohletz (1992) 16/04/2015 Angélie Portal EGU General Assembly
4 The Chaîne des Puys volcanic field Volcanic ~N-S alignment West of the Limagne graben More than 100 volcanic edifices (lava domes, strombolian cones, maars). The Puy de Dôme volcano 11,000 yrs old trachytic lava dome huge edifice as compared to other volcanic edifices The Puy de Dôme View from the North Photo P. SOISSON Puy de Dôme western flank Photo P. SOISSON 16/04/2015 Angélie Portal EGU General Assembly
5 The Puy de Dôme volcano Structural analysis Flat summit area Block and ash avalanche deposits fans toward West and East 2 zones showing deformation structures (N and S of the dome) underlying intrusion? (van Wyk de Vries and al., 2014) 16/04/2015 Angélie Portal EGU General Assembly
6 The Puy de Dôme volcano Slope analysis Flat summit area Block and ash avalanche deposits fans toward West and East 2 zones showing deformation structures (N and S of the dome) underlying intrusion? (van Wyk de Vries and al., 2014) High slopes (>40 ): limited to the summit part solid carapace Intermediate slopes (35-40 ) solid carapace covered by Puy de Dôme deposits Low slopes (30-35 ) unconsolidate materials 16/04/2015 Angélie Portal EGU General Assembly
7 The Puy de Dôme volcano Slope analysis Flat summit area Block and ash avalanche deposits fans toward West and East 2 zones showing deformation structures (N and S of the dome) underlying intrusion? (van Wyk de Vries and al., 2014) High slopes (>40 ): limited to the summit part solid carapace Intermediate slopes (35-40 ) solid carapace Objectives covered by Puy de Dôme deposits Low slopes (30-35 ) Provide geological model of the Puy de Dôme inner structure unconsolidate Constrain materials the relation between the dome and its surroundings 16/04/2015 Angélie Portal EGU General Assembly
8 Gravity measurements Gravity measurements location map Relative measurements (Scintrex Autograv CG-5) 1350 gravity stations Precise DGPS positioning 16/04/2015 Angélie Portal EGU General Assembly
9 Magnetic measurements Magnetic surveys location map Proton-precession magnetometer (Overhauser) 0.5s sampling interval Simultaneous GPS positionning 16/04/2015 Angélie Portal EGU General Assembly
10 Bouguer anomaly map Density correction ρ corr = 1.8 * 10 3 kg.m -3 Regional trend = 2 nd degree polynomial surface 16/04/2015 Angélie Portal EGU General Assembly
11 Bouguer anomaly map Density correction ρ corr = 1.8 * 10 3 kg.m -3 Regional trend = 2 nd degree polynomial surface Qualitative interpretation Negative Bouguer anomaly values Scoria cones/maar (low density structures) 16/04/2015 Angélie Portal EGU General Assembly
12 Bouguer anomaly map Density correction ρ corr = 1.8 * 10 3 kg.m -3 Regional trend = 2 nd degree polynomial surface Qualitative interpretation Negative Bouguer anomaly values Scoria cones/maar (low density structures) Positive anomalies Lava flows? 16/04/2015 Angélie Portal EGU General Assembly
13 Bouguer anomaly map Density correction ρ corr = 1.8 * 10 3 kg.m -3 Regional trend = 2 nd degree polynomial surface Qualitative interpretation Negative Bouguer anomaly values Scoria cones/maar (low density structures) Positive anomalies Lava flows? Puy de Dôme: complex anomaly Central positive anomaly dense rock core Negative anomaly toward S underlying Puy Lacroix scoria cone Positive anomaly on the northern flank 16/04/2015 Angélie Portal EGU General Assembly
14 Magnetic anomaly map Reduction to the magnetic pole (I=60, D=0) 16/04/2015 Angélie Portal EGU General Assembly
15 Magnetic anomaly map Reduction to the magnetic pole (I=60, D=0) Qualitative interpretation Negative anomaly on both sides of the PdD 16/04/2015 Angélie Portal EGU General Assembly
16 Magnetic anomaly map Reduction to the magnetic pole (I=60, D=0) Qualitative interpretation Negative anomaly on both sides of the PdD Positive anomaly of the dome itself Lava dome massive core? 2 high anomalies (>3000 nt) northward to the PdD 3D representation of the magnetic anomaly 16/04/2015 Angélie Portal EGU General Assembly
17 Magnetic anomaly map Reduction to the magnetic pole (I=60, D=0) Qualitative interpretation Negative anomaly on both sides of the PdD Positive anomaly of the dome itself Lava dome massive core? 2 high anomalies (>3000 nt) northward to the PdD Massive volcanic rocks (intrusion, filled crater?) 16/04/2015 Angélie Portal EGU General Assembly
18 2D 1/2 model Slice WE Slice SN Direct model of the Bouguer anomaly based on inferred geological structure Low density basement (ρ<1.6) High density structures at depth (ρ 2.6) Wide density range for the Puy de Dôme 16/04/2015 Angélie Portal EGU General Assembly
19 Geological interpretation Slice WE Slice SN 16/04/2015 Angélie Portal EGU General Assembly
20 Geological interpretation Slice WE Slice SN Basement older scoria cones partially (e.g. Petit Puy de Dôme) or totaly covered (Puy Lacroix) associated lava flows oriented toward East and West Puy de Dôme central massive intrusion (dyke) with W-E extension breccia ring around the intrusion, probably highly altered by hydrothermal fluids edifice mainly composed of unconsolidated material (blocks, pyroclastites and breccias) Geological interpretation of the northern part of the volcanic system stays difficult 16/04/2015 Angélie Portal EGU General Assembly
21 Conclusion Morpho-structural analysis shows that the Puy de Dôme is a composite edifice New gravity and magnetic anomalies maps highlight the well identified geological features provide new information about the dome complexity 2D direct modeling of the Bouguer anomaly better simulates complex geological structures whereas 3D approach provides more global information Comparison with complementary geophysical models (ERT, muography) give constraints about the geological structure of the dome (see Portal et al., 2015, GMPV6.5 poster session) Observations of recent domes growth suggest composite structure of dome after the end of the eruption Confirmed by our study of the Puy de Dôme volcano! 16/04/2015 Angélie Portal EGU General Assembly
22 Thank you for your attention! References Major, J. J., W. E. Scott, C. Driegger, and D. D. Dzurisin (2005), Mount St. Helens Erupts Again - Activity from September trough March. Portal, A. et al. (2013), Inner structure of the Puy de Dôme volcano: cross-comparison of geophysical models (ERT, gravimetry, muon imaging), Geosci. Instrumentation, Methods Data Syst., 2(1), Wohletz, K. (1992), Volcanology and geothermal energy / Kenneth Wohletz, Grant Heiken, Los Alamos series in basic and applied sciences 12, edited by G. Heiken, University of California Press, Berkeley. Van Wyk de Vries, B., A. Márquez, R. Herrera, J. L. G. Bruña, P. Llanes, and A. Delcamp (2014), Craters of elevation revisited: forcedfolds, bulging and uplift of volcanoes, Bull. Volcanol., 76(11), /04/2015 Angélie Portal EGU General Assembly 2015 Photo P. Soisson 22
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