Figure 1. ENVISAT beam mode 4, track 136 interferogram spanning 11 April to 20 June 2007. Bulls-eye-shaped subsidence at the summit was caused by withdrawal of magma from a shallow storage area beneath the caldera center to feed the intrusion that is indicated by the butterfly-shaped pattern of uplift in the center of the image.

Figure 2. ENVISAT beam mode 2, track 93 interferograms spanning (A) 13 May to 17 June (10:20 PM HST) 2007, and (B) 17 June (10:20PM HST) to 22 July 2007. Both inflation of the rift zone as a result of the 17-19 June 2007 intrusion/eruption, although greater deformation in the second interferogram suggests that the bulk of the intrusion was emplaced after 10:20 PM HST on 17 June 2007.

Figure 3. ENVISAT ASAR beam mode 6, track 179 interferogram spanning 20 May to 29 July, 2007. Large image (left) is characterized by summit deflation and rift inflation, indicating magma intrusion into the east rift zone (which occurred during 17-19 June 2007). Zoomed image (right) focuses on deformation around Pu‘u ‘Ō‘ō, which is restricted to the cone and area of the 21 July eruptive fissure between Pu‘u ‘Ō‘ō and Kupaianaha.

Figure 4. Top: Distribution of persistent scatterers (PSs) and cumulative range change from 12 February 2003 to 8 March 2006 overlain on Landsat visible color image. Red line approximately follows the east and southwest rift zones and is the boundary for flank failure; black lines are mapped fault traces. Red arrows indicate the general direction of flank motion. Bottom: Colored lines are profiles consisting of swath averages for PSs from each interferogram in the dataset. They show range change relative to 15 October 2003 for the dates corresponding to the line color. Swath corresponds to dashed white box labeled B-B' in upper figure. Black dashed lines show locations of mapped fault traces crossing the swath. Solid black line is the elevation along the swaths.

Figure 5. ENVISAT interferogram spanning 3 August 2005 to 4 July 2007 Figure 5. ENVISAT interferogram spanning 3 August 2005 to 4 July 2007. The entire caldera is uplifting while subsidence is occurring in the Norris Geyser Basin area.

Figure 6. (a) ENVISAT InSAR image (July-Oct, 2006) of Korovin volcano, showing island-wide inflation associated with a seismic swarm. (b) ERS-2 InSAR image (1999-2000) depicts inflation of the island similar to that observed in 2006.

Figure 7. ERS-1/2 interferometric stack of Veniaminof volcano showing no significant deformation during 1992-2000. Coherence is low at the volcano’s summit due to glacial ice and perennial snow pack.

Figure 8. (a) ERS-1/2 interferometric stack for Pavlof volcano showing no significant deformation during 1992-2000. (b) L-band ALOS InSAR image bracketing the August 2007 eruption, showing loss of coherence over the snow-covered summit and no significant deformation over the flanks of Pavlof.

Figure 9. ERS-2 interferogram of Cleveland volcano spanning June-September 2005 that shows no significant deformation associated with the volcano’s July 2005 eruption.