Surface deformation studies of Tenerife Island, Spain from joint GPS-DInSAR observations

This work presents results for the three-dimensional displacement field at Tenerife Island calculated from campaign GPS and ascending and descending ENVISAT DInSAR interferograms. The goal of this work is to provide an example of the flexibility of the technique by fusing together new varieties of geodetic data, and to observe surface deformations and study precursors of potential activity in volcanic regions. Interferometric processing of ENVISAT data was performed with GAMMA software. All possible combinations were used to create interferograms and then stacking was used to increase signal-to-noise ratio. Decorrelated areas were widely observed, particularly for interferograms with large perpendicular baseline and large time span. Tropospheric signal was also observed which significantly complicated the interpretation. Subsidence signal was observed in the NW part of the island and around Mount Teide and agreed in some regions with campaign GPS data. It is expected that the technique will provide better results when more high quality DInSAR and GPS data is available

Diseño de un sistema de auscultación de subsidencias mediante técnicas geomáticas

La subsidencia del terreno constituye un riesgo geotécnico capaz de afectar a amplias zonas del territorio. Este fenómeno puede producirse por la consolidación de los suelos finos de un sistema acuífero, disolución y colapso de materiales yesíferos, actuaciones humanes, etc. Muchas regiones del mundo, y gran parte de la geografía peninsular, pueden verse afectadas de manera significativa por este fenómeno. En este proyecto se pretende crear una metodología de trabajo que se pueda aplicar en cualquier ámbito geográfico para el control de las subsidencias. Para la realización de esta metodología se han tomado tres técnicas de auscultación de subsidencias, nivelación geométrica de precisión, nivelación GPS y DinSAR, y comparado sus pros y contras, así como las precisiones esperadas y el organigrama de trabajo. Para que se vea mejor la funcionalidad del sistema, se ha procedido a la implantación teórica del mismo en una localización al Norte de la ciudad de Madrid con un escenario realista. Abstract Subsidence is a geotechnical risk which can affect large countryside areas. This phenomenon may be produced by the consolidation of an aquifer system fine soils, dissolution and collapse of gypsum materials, human actions, etc. Many regions of the world, and much of the Iberian Peninsula, may be significantly affected by this condition. This project aims to create a methodology that can be applied in any geographical area to control subsidence. For this purpose, three subsidence monitoring techniques have been studied. Those are precision geometric leveling, GPS leveling and DInSAR. During the project, pros and cons as well as the precisions expected and work schedule have been studied and compared. The subsidence auscultation system has been theoretically implemented in a location. This location is a realistic stage located north of Madrid