Figure 1 ENVISAT beam mode 2, track 61 interferogram covering June 26, 2004 to Febrary 26, 2005. Inflation amounts to several tens of centimeters and.

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Presentation transcript:

Figure 1 ENVISAT beam mode 2, track 61 interferogram covering June 26, 2004 to Febrary 26, 2005. Inflation amounts to several tens of centimeters and is centered on the caldera.

Figure 2 ENVISAT beam mode 2, track 61 interferogram spanning January 22 to August 20, 2005 and showing the combined effects of volcano inflation and faulting along the intracaldera fault system.

Figure 3 ENVISAT beam mode 5, track 376 interferogram spanning August 7 to October 16, 2005. The triangular pattern of uplift may reflect deformation due to a 4.6 magnitude earthquake on September 19, 2005.

Figure 4 ENVISAT beam mode 2, track 61 interferogram spanning September 24 to October 29, 2005. The broad deflation accompanied an eruption of the volcano that started on October 22, 2005.

Figure 5 ENVISAT beam mode 2, track 61 interferogram spanning January 7 to March 18, 2006, showing post-eruption uplift of the volcano. The incoherent area on the east side of the caldera is the location of lava flow emplacement during the October 2005 eruption.

Figure 6 InSAR/CGPS data and comparison with fault models. (A) InSAR observations and horizontal CGPS displacements indicating uplift during 12-Feb-04 to 27-Jan-05. The InSAR data are displayed at 10 cm range change per fringe. (B) InSAR/CGPS observations from 27-Jan-05 to 12-May-05 showing the effect of both uplift and faulting. (C) Same InSAR observations as in (B), but corrected for uplift and effectively only showing deformation due to the faulting on 16-Apr-05. Black and red vectors show observed and predicted horizontal displacements, respectively. Yellow vectors in (C-D) show predicted displacements from the model of Amelung et al. (Nature, v. 407, p. 993). (D) Simulated interferogram from our fault model (inset). Black and red vectors show observed and predicted vertical displacements, respectively. (E) Residual between the InSAR data in (C) and the model prediction in (D) and residual horizontal CGPS displacements. Focal mechanism shows modeled sense of slip. Figure from Chadwick et al. (in press).

Figure 7 InSAR results from the time period September 24 to October 29, 2005, spanning the eruption of Sierra Negra. (A) Observed range change. (B) Range change modeled by a coupled sill and Mogi source. (C) Residual deformation. Figure from Geist et al. (in review).