|Measurement method(s):||InSAR, GPS - continuous|
|Duration of observation:||1992 - 1999 (InSAR Ref1.) 2002 - 2005(Cont GPS) / 1992-2005 (GPS and InSAR) ref 3|
|Inferred cause of deformation:||Faulting/tectonics|
|Characteristics of deformation:||
Sierra Negra, exhibited spatially and temporally variable deformation, with a maximum uplift of 2.7 m between 1992 and 1999, which can be modelled by a shallow inflating sill. Sierra Negra experienced particularly dramatic and variable ground deformation. A peak radar line-of-sight (LOS) displacement (range decrease) of 2.2 m between 1992 and 1998 (corresponding to 2.4 m of uplift; see Fig. 1) and 0.3 m during the September 1998 to March 1999 period. The corresponding displacement rates vary from 0.32 m yr-1 during 1992–97, to 0.90 m yr-1 during 1997–98, and 0.65 m yr-1 during 1998–99. Ref 1.
|References:||'Amelung, F., S. Jónsson, H. Zebker, and P. Segall (2000), Widespread uplift and “trapdoor” faulting on Galápagos volcanoes observed with radar interferometry, Nature, 407, 993–996, doi:10.1038/35039604.', 'Chadwick, W. W., Geist, D. J., Jónsson, S., Poland, M., Johnson, D. J., & Meertens, C. M. (2006). A volcano bursting at the seams: inflation, faulting, and eruption at Sierra Negra Volcano, Galápagos. Geology, 34(12), 1025-1028.', 'Jónsson, S. (2009). Stress interaction between magma accumulation and trapdoor faulting on Sierra Negra volcano, Galápagos. Tectonophysics, 471(1), 36-44.'|