GEODYNAMIC CONSTRAINTS OF CANARIAN VOLCANISM

04 Sep 2013 | Contributor(s): Joan Marti, Adelina Geyer Traver

The intimate relationship between tectonism and magmatism is evident in all volcanic environments where magma production, magma ascent rate, loci of volcanic activity, and even the style of volcanic activity, are directly dependent on the regional/local tectonic characteristics of the area. A...

THE STUDY OF EPHEMERAL OUTCROPS: THE EXAMPLE OF THE GARROTXA VOLCANIC FIELD

04 Sep 2013 | Contributor(s): Xavier Bolos, Llorenç Planaguma, Joan Marti

The study of ephemeral outcrops is an important tool to reconstruct the geology of highly urbanised areas in which increasing construction and occupation of soil difficult direct observations. During the last decade, the Natural Park of the Garrotxa Volcanic Field (NE Spain) has undertaken a...

Correlation of Magma Evolution and Geophysical Monitoring during the 2011^2012 El Hierro (Canary Islands) Submarine Eruption

04 Sep 2013 | Contributor(s): Joan Marti, Antonio Castro, Carmen Rodriguez, Fidel Costa, Sandra Carrasquilla, Rocio Pedreira, Xavier Bolos

The application of petrography, mineral chemistry, geochemistry, and xperimental petrology, including mineral^melt thermodynamic and diffusion modelling, on quenched basanitic magma samples from the recent (2011^2012) submarine eruption of El Hierro (Canary Islands) has permitted the...

Electrical resistivity tomography revealing the internal structure of monogenetic volcanoes

04 Sep 2013 | Contributor(s): Stephanie Barde-Cabusson, Xavier Bolos, Dario Pedrazzi, Raul Lovera, Guillem Serra, Joan Marti, Albert Casas

Eruptive activity of individual monogenetic volcanoes usually lasts a few days or weeks. However, their short lifetime does not always mean that their dynamics andstructure are simple. Monogenetic cones construction is rarely witnessed from the beginning to the end, and conditions for observing...

A PROBABILISTIC METHOD TO CALCULATE VOLCANIC SUSCEPTIBILITY

04 Sep 2013 | Contributor(s): Steffania Bartolini, A. Cappello, Joan Marti, Rosa Sobradelo, Stephanie Barde-Cabusson

In modern volcanology one of the most important aim is to perform hazard maps simulating different eruptive scenarios. The first step is to evaluate the spatial distribution of future vents, based on the past behavior of the studied area. Previous work were done using the kernel density...

STRUCTURAL CONTROLS ON MONOGENETIC VOLCANISM: THE GARROTXA VOLCANIC FIELD CASE STUDY

04 Sep 2013 | Contributor(s): Xavier Bolos, Stephanie Barde-Cabusson, Jo Gottsmann, Joan Marti, Dario Pedrazzi, Llorenç Planaguma, Antonio Camacho, Adelina Geyer Traver, Erika Ronchin

The factors controlling the precursory activity in monogenetic volcanic fields are still poorly understood, which makes that eruption forecasts in these systems is not very accurate. The fact that in monogenetic volcanism each eruption has a different vent suggests that volcanic susceptibility...

HASSET: A probability event tree tool to evaluate future eruptive scenarios based on Bayesian Inference. Presented as a plugin for QGis

04 Sep 2013 | Contributor(s): Rosa Sobradelo, Steffania Bartolini, Joan Marti

Event tree structures constitute one of the most useful and necessary tools of modern volcanology to assess the volcanic hazard of future eruptive scenarios. They are particularly relevant to evaluate long- and short-term probabilities of occurrence of possible volcanic scenarios and their...

COMUNICATION PROTOCOLS QUESTIONNAIRE

04 Sep 2013 | Contributor(s): Alicia Felpeto, Joan Marti, Rosa Sobradelo

Barcelona Workshop 2013:Within WP8 activities, a questionnaire has been designed to collect information of the way the scientists and decision-makers transmit the information between them and to the population/media. We hope it will help us to identify different communication structures and...

INTERPRETING TREMOR CHANGES DURING 2011-2012 EL HIERRO ERUPTION (CANARY ISLANDS)

04 Sep 2013 | Contributor(s): Marta Tarraga, Joan Marti, Roberto Carniel, Rafael Abella, Carmen López

Barcelona Workshop 2013One of the most informative geophysical signals that can be recorded on a volcano is the tremor, which has been used as a precursor of eruptive activity as well as a marker of changes of the eruption dynamics. In this contribution we analyse the strong tremor signal that...

VOLADA – the first collaborative data base on Volcanic Lakes

23 Aug 2013 | Contributor(s): dmitri rouwet, Veronica Chiarini

There are more volcanic lakes on Earth than previously thought. The here presented data base is first in its kind and compiles the available information on ~340 volcanic lakes worldwide. It aims to become a complete and interactive tool, in which researchers can add, extract and use data in a...

A probabilistic framework to quantify hazard related to volcanic lakes

23 Aug 2013 | Contributor(s): dmitri rouwet, Laura Sandri, raul mora-amador

The presence of a volcanic lake increases the probability of certain types of volcanic hazard. So far, this topic has only been approached in a purely deterministic way, e.g.: phreatic-phreatomagmatic eruption behavior, dynamics of Nyos-type gas bursts and gas accumulation and dispersion, models...

Numerical simulations (TOUGH2) to quantify crater lake seepage: a case study for Laguna Caliente, Poás Volcano (Costa Rica)

23 Aug 2013 | Contributor(s): massimo nespoli, micol todesco, dmitri rouwet, maurizio bonafede, raul mora-amador

Volcanic lakes are different from the common reservoirs of meteoric origin because of the interaction with the hydrothermal system of the volcano. The hot fluids (gas + liquid) of volcanic origin rise through the bottom of the lake resulting in strong acidic water and a variable temperature...

Qualitative insights (Cl, D) into evaporative degassing from active crater lakes: theoretical background and practical tools

23 Aug 2013 | Contributor(s): dmitri rouwet, Takeshi Ohba

This work provides the theoretical background and necessary practical tools to study one of the most spectacular natural features: vigorous evaporation from active crater lakes. We will give qualitative insights (lake water chemical –Cl content, and isotopical composition) rather than quantify...

Science & Arts workshops to increase volcanic risk awareness: Chapultenango, near El Chichón volcano (Chiapas, Mexico)

23 Aug 2013 | Contributor(s): dmitri rouwet, marta iorio, Demetrio Polgovsky

This independent and informal study is based on good-will, common sense, working ethics and morality, rather than on a pre-meditated education method or strategy, with the goal to increase the public awareness of volcanic risk in the Zoque indigenous community of Chapultenango, near El Chichón...