Deformation and Gravity Change: Indicators of Isostasy, Tectonics, Volcanism, and Climate Change

Most of the papers in this book were presented at the workshop on "Deformation and Gravity Change: Indicators of Isostasy, Tectonics, Volcanism and Climate Change", which took place at the Casa de los Volcanes on Lanzarote, Spain, during March 1-4, 2005. It was jointly organized and supported by the International Association of Geodesy (IAG), the Spanish Ministry of Education and Science, the Spanish Council for Scientific Research and the Cabildo Insular de Lanzarote.

The workshop also served as the first meeting of the members of the IAG Working Group ICCT2 on "Dynamic Theories of Deformation and Gravity Fields". This subject reflects the major developments in geodynamics during the last decade, when temporal variations of the deformation and gravity fields recorded by the geodetic measuring techniques and reflecting isostatic, tectonic or volcanic processes in the earth’s interior as well as hydrologic or oceanographic processes on its surface have gained ever increasing importance.

Deformation and Gravity Change: Indicators of Isostasy, Tectonics, Volcanism and Climate Change. Introduction.- Interpretation of 1992-1994 gravity changes in Mayon volcano, Philippines, using point sources.- Some insights about topographic, elastic and self-gravitation interaction in modelling ground deformation and gravity changes in active volcanic areas.-Shear-wave velocity structure at Teide volcano. Results using microtremors and the SPAC method. Implications for interpretation of geodetic results.- Steric sea level variations inferred from combined Topex/Poseidon altimetry and GRACE gravimetry.- Propagator-matrix technique for the viscoelastic response of a multi-layered sphere to surface toroidal traction.- Modeling of Stress Changes at Mayon Volcano, Philippines.- A hybrid model for the summit region of Merapi volcano, Java, Indonesia, derived from gravity changes and deformation measured between 2000 and 2002.- Glacial-isostatic adjustment and the viscosity structure underlying Iceland.- Vertical crustal motion along the Mediterranean and Black Seas coasts derived from ocean altimetry, tide gauge, and continuous GPS data.- An estimate of global sea-level rise inferred from tide-gauge measurements using glacial-isostatic models consistent with the relative sea-level record.- Using fuzzy-set classification for the analysis of sea-level indicators with respect to glacial-isostatic adjustment.- An overview of the Small BAseline Subset Algorithm: a DInSAR technique for surface deformation analysis.- Insight into the internal dynamics (plumbing) of Etna volcano through discrete and continuous microgravity observations.