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Clouard V.,Observatoire Volcanologique et Sismologique de Martinique OVSM IPGP | Clouard V.,CNRS Paris Institute of Global Physics | Athanase J.-E.,Observatoire Volcanologique et Sismologique de Martinique OVSM IPGP | Aubaud C.,Observatoire Volcanologique et Sismologique de Martinique OVSM IPGP | Aubaud C.,University of Paris Pantheon Sorbonne
Bulletin de la Societe Geologique de France | Year: 2013

Flank destabilizations are common processes in the life of a volcano. Apart from giant landslides with recurrence times of tens of thousands of years and whose deposits are identified in the bathymetry around the islands, less voluminous but more frequent erosional landslides contribute significantly to the morphological development of the topography. In this paper, we present a detailed description of a landslide sequence that occurred in 2009 and 2010 on the western flank of Montagne Pelée volcano, originating at the Samperre cliff. This sequence is characterized by two main events, in August 2009 and May 2010, and hundreds of smaller collapses. From seismic data and high resolution topographic data from airborne Lidar, collapses are counted and volumes of the main events are estimated. The May 2010 landslide has removed 2.1 millions of m3 of debris, which were subsequently remobilized during several hazardous lahars. The mean rates of erosion deduced from these volumes indicate that this kind of erosional landslide could represent a long term contribution of the same order of magnitude as giant flank collapses. The characterization of the runout of the landslides and of the Samperre cliff slopes provide important information for risk assessment, in particular for the risk of lahars that threaten the population living on the lower slopes.

Anglade A.,Observatoire Volcanologique et Sismologique de Guadeloupe OVSG IPGP | Lemarchand A.,CNRS Paris Institute of Global Physics | Saurel J.-M.,Observatoire Volcanologique et Sismologique de Martinique OVSM IPGP | Clouard V.,Observatoire Volcanologique et Sismologique de Martinique OVSM IPGP | And 12 more authors.
Advances in Geosciences | Year: 2015

In the last few years, French West Indies observatories from the Institut de Physique du Globe de Paris (IPGP), in collaboration with The UWI Seismic Research Centre (SRC, University of West Indies), have modernized the Lesser Antilles Arc seismic and deformation monitoring network. 15 new, permanent stations have been installed that strengthen and expand its detection capabilities. The global network of the IPGP-SRC consortium is now composed of 20 modernized stations, all equipped with broadband seismometers, strong motion sensors, Global Positioning System (GPS) sensors and satellite communication for real-time data transfer. To enhance the sensitivity and reduce ambient noise, special efforts were made to improve the design of the seismic vault and the original Stuttgart shielding of the broadband seismometers (240 and 120s corner period). Tests were conducted for several months, involving different types of countermeasures, to achieve the highest performance level of the seismometers. GPS data, realtime and validated seismic data (only broadband) are now available from the IPGP data centre (http://centrededonnees.ipgp. fr/index.php?lang=EN). This upgraded network feeds the Caribbean TsunamiWarning System supported by UNESCO and establishes a monitoring tool that produces high quality data for studying subduction and volcanic processes in the Lesser Antilles arc. © Author(s) 2015.

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