Deformación volcánica durante etapas inter-eruptivas :Three Sisters (Cordillera de las Cascadas, EE.UU) como caso de estudio

Résumé

Most volcanic eruptions are preceded by reactivation processes that can be observed on the earth’s surface. Therefore, the interpretation of these signs of reactivation is essential for the forecasting of volcanic events. In volcanic areas, this surveillance is carried out through the monitoring of deformations, using spatial geodetic techniques such as the Global Satellite Navigation Systems (GNSS) and the Synthetic Aperture Radar Interferometry (InSAR). The interpretation of reactivation signals requires the use of physical-mathematical models, which allow obtaining the location, geometry and specific volume changes of different areas of magma accumulation, as well as establishing the possible dynamics of the physical mechanisms involved.The Three Sisters volcanic complex (Cascade Range, USA), which we dealt with in this Doctoral Thesis, is a good example of a system with long lasting monotonous inter-eruptive uplift without associated eruptive activity or significant seismicity. It presents an active uplift from the year 1996 to nowadays. The possibility of future eruptions similar to those that occurred 2000 years ago in the South Sisters area represent a clear threat to nearby populations...