Temporal evolution of the magmatic system at Tungurahua Volcano, Ecuador, detected by geodetic observations

摘要: Abstract Changes in the pathway and timescale of magma ascent can be responsible for variations eruptive style during long-lived eruptions, but are only documented at a small number well-instrumented systems. Here we integrate PS-InSAR from high resolution TerraSAR-X radar imagery with continuous GPS data 4 sites Tungurahua volcano, Ecuador. Our results show long-term uplift between 2011 2014 associated continuously inflating prolate spheroid reservoir depth ∼ 10 km beneath summit. Comparisons flux, taking compressibility into account, suggest that this time period slightly over half supplied to system was erupted. The observations span three distinct phases eruption 2012–2013, an increase activity accompanied by on volcano's western flank. Similar episodes have previously been observed large Vulcanian eruptions attribute them intrusions area mechanical weakness. A localised patch subsidence mid-way up Tungurahua's flank is co-located swarm shallow long-period seismicity may represent potential site development lateral vent. This study demonstrates satellite geodetic techniques capable characterising signature transitions andesitic even where deformation low magnitude measurements challenging.