Présidents de session
Volcanology
- Aldo Zollo (Univ Naples)
Volcanology
- Aldo Zollo (Univ Naples)
Volcanology: Volcanology Round Table
- Aldo Zollo (Univ Naples)
Prof.
Jean-Luc GOT
(ISTERRE, CNRS, Université de Savoie)
18/04/2012 09:20
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
Muon radiography of volcanoes aims at estimating the density of rocks constituting the volcanic edifice from muon fluxes. Earthquake tomography aims at estimating the seismic velocity of the same rocks from the travel times of seismic waves. Muon radiography and earthquake tomography are inverse problems that share some similar features - muon flux variation and travel time may be both written...
Dr
Sebastien Valade
(LMV, Université Blaise Pascal)
18/04/2012 09:40
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
We have investigated the dynamics of volcanic explosive eruptions, from the sub-surface source mechanisms through to the surface emission dynamics. To this end, we carried out a cross-correlation of broadband seismic data and ground-based Doppler radar data (VOLDORAD) recorded at Arenal (Costa Rica). Arenal is a small stratovolcano ca. 1.1 km in height, characterized by a mildly-explosive...
Lydie Gailler
(LMV-BRGM)
18/04/2012 10:00
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
Guadeloupe Island (West French Indies) is one of the twenty islands that compose the Lesser Antilles Arc, which results from the subduction of the Atlantic Ocean plate beneath the Caribbean one. The island lies in a complex volcano-tectonic system and the need to understand its geological context has led to numerous on- and offshore geophysical investigations. This work presents the...
Mlle
Lydie Gailler
(LMV-BRGM)
18/04/2012 10:20
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
The island of La Réunion (Indian Ocean) is a large oceanic volcanic system of which most of the volume is submerged. We present a study of its internal structure using geophysical methods. Subaerial and marine gravity and magnetic measurements have been compiled with terrestrial-based electromagnetic surveys. Geophysical models have been constructed using geological constraints and results...
M.
Didier Miallier
(Laboratoire de Physique Corpusculaire Clermont Université - Université Blaise Pascal CNRS-IN2P3)
18/04/2012 11:10
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
The project TOMUVOL, aimed at developing a method for muonic tomography of volcanic edifices, has chosen the Puy de Dôme as an experimental test site. In fact, this volcano with a simple external shape has a complex internal structure that may allow testing the performances of this new method.
The Puy de Dôme is a composite lava dome, about 11 ka old. It is composed of two distinct...
Angélie PORTAL
(OPGC-LMV)
18/04/2012 11:30
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
Muon imagery of volcanoes and other types of geological structures is presently actively developed by several groups in the world. It has the potential capability to provide the 2D or 3D distribution of density with an accuracy of a few percent. However, at this stage of the development of the method, comparisons with the results from established geophysical methods are necessary to validate...
M.
Valentin Niess
(LPC, Clermont)
18/04/2012 11:50
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
High energy (10^11+ eV) atmospheric muons are a natural probe for geophysical studies. They can travel through hundreds to kilometers of rocks allowing for a radiography of the density distributions within large structures, the like mountains or volcanoes. A collaboration between volcanologists, astroparticle- and particle physicists, TOMUVOL, has been formed in 2009 to study tomographic muon...
Prof.
Hiroyuki Tanaka
(University of Tokyo)
18/04/2012 12:10
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
We have developed a multilayer, scintillator based, segmented muon hodoscope with the capacity to create up to 8 layers. One of the most important processes of cosmic ray muon radiography is the ability to select muon trajectories with precision from simultaneously arriving, vertical electromagnetic (EM) background components. As the size of the target increases, the muon path length of the...
Prof.
Dominique GIBERT
(Institut de Physique du Globe de Paris)
18/04/2012 14:00
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
We present density radiographies obtained for the Soufrière of Guadeloupe lava dome, both in the North-South and East-West planes. These radiographies reveal the highly heterogeneous density structure of the volcano, with low-density regions corresponding to recognized hydrothermally altered areas. The main structures observed in the density radiographies correlate with anomalies in electrical...
Dr
Andrea Russo
(INFN Napoli)
18/04/2012 14:20
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
The improvements of automated scanning systems have produced an impressive revival of the nuclear emulsion technique, thus allowing their large scale application in particle physics experiments. The
portability of a nuclear emulsion based detector makes it well suitable also for the muon radiography of internal structures of volcanoes. We present the application of this technique to the study...
Fabio Ambrosino
(Dipartimento di Scienze Fisiche Università degli Studi di Napoli "Federico II" e Sezione INFN, Napoli)
18/04/2012 14:40
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
The MU-RAY project aims at the construction of muon telescopes and the development of new analysis tools for muon radiography. The telescopes are required to be able to work in harsh environment and to have low power consumption, good angular and time resolutions, large active area and modularity. A high background suppression is required.
A prototype telescope has been constructed. The...
Dr
Joachim Gottsmann
(University of Bristol)
18/04/2012 15:00
Dr
Tony Hurst
(GNS Science)
18/04/2012 15:20
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
Ngauruhoe (2287 m high) was New Zealand’s most active volcano for over a century until 1975, when after a series of Vulcanian eruptions, it became quiescent. It is a steep conical volcano, which had an open vent about 200 metres deep in late 1973, which has since filled up. It is important in considering the hazard of future eruptions, and in interpreting any possible eruption precursors, to...
Prof.
Hiroyuki Tanaka
(University of Tokyo)
18/04/2012 15:40
Applications of muon imaging in volcanology; multi-probe structure study of volcanoes
Oral
Additional strategies to modify the rapid time measurement system of muon radiography may make it possible to survey a target without knowledge of its exterior shape. Examples of such targets would be an activated volcano with a growing lava dome or the geology of extraterrestrial exploration. Established techniques of muon radiography rely on precise exterior shape data because the method...
Prof.
Aldo Zollo
(Univ Naples)
18/04/2012 16:30
Jean-Luc GOT
(ISTERRE)
18/04/2012 16:45
Jean-François Lénat
(UMR 6524 CNRS "Magmas et Volcans")
18/04/2012 16:55
Prof.
Hiroyuki Tanaka
(University of Tokyo)
18/04/2012 17:05
Prof.
Paolo Emilio Strolin
(Univ. Napoli and INFN)
18/04/2012 17:15
Dominique GIBERT
(Institut de Physique du Globe de Paris)
18/04/2012 17:25
