Montagne Pélée (Martinique) and Soufrière (Guadeloupe): possible test beds for muon tomography in French volcanoes. situation - recent eruptions - detector development - inversion methods Dominique Gibert & Albert Tarantola Institut de Physique du Globe de Paris International Workshop on High Energy Earth Science, June 26-27, 2008, Tokyo
La Guadeloupe (Soufrière) La Martinique (Montagne Pélée)
A spine (made of viscuous andesitic magma) grows during during 1902 - 1903, at the rate of 15 m/day, reaching a height of 350 meters.
Cyparis, the only survivor among more than 26 000 inhabitants.
La Soufrière (Guadeloupe Island)
The Soufrière (Guadeloupe Island) lava dome (view from the South). Note its regular shape, its relatively flat summit topography and the presence of small spines on its southwest part. 1, Saussure peak. 2, Dolomieu peak. 3, Cratère sud. 4, Carbet Springs. 5, Tarade. Last magmatic eruption: 1530 A.D. From Boudon et al., 2008
Seismology (4/38) Continuous GPS (1/3) Inclinometry (5/6) Distancemetry (7/8) Extensometry (14/16) Repetition GPS (23/27) Wells (2/2) Magnetism (5/7) Spont. polariz. (1/2) Gravimetry (24/31) Gas fumerolles (7/7) Thermals springs (8/9) Radon gas (8/8) Meteorology (1/3) Pluviometry (3/7) Telemetry nodes (2/4) - - - Radio telemetry - - - Laser Telemetry
Schematic cross-section through the summit area of La Soufrière Volcano.
We plan to build two detectors (each made with one input and one output layer, each layer being made of two perpendicular collections of 32 linear scintillator strips). Matrix of 32 x 32 = 1024 pixels. Area of the matrix: 1.6m x 1.6 m . Separation between the two matrices: variable between 0.5 m and 2 m. Power consumption 10-15 W (including the 1 W WiFi connection). Electronic board integrates photomultiplier, high voltage alimentation, analog-to- digital conversion, GPS clock, and ethernet connection. It contains a processor running Linux.
prior models
prior models posterior models
_____________________________________ | e = 0.0 | e = 0.1 | e = 10. | _____________________________________ | +42.85 | +42.90 | +47.84 | | - 4.46 | - 4.41 | + 0.67 | | + 5.32 | + 5.32 | + 5.33 | | + 7.06 | + 7.09 | + 9.42 | | + 5.65 | + 5.73 | +13.59 | | + 0.87 | + 0.81 | - 4.57 | | - 0.08 | + 0.04 | +12.46 | | - 2.12 | - 2.05 | + 4.51 | | +31.10 | +31.01 | +22.32 | | +38.43 | +38.45 | +40.32 | | +22.74 | +22.72 | +20.19 | | + 2.03 | + 1.87 | -13.82 | | ... | ... | ... |
posterior posterior prior e = 0.1 e = 10. 20 20 20 10 10 10 0 0 0 -2 0 +2 +4 -2 0 +2 +4 -2 0 +2 +4 20 20 20 10 10 10 0 0 0 -2 0 +2 +4 -2 0 +2 +4 -2 0 +2 +4
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