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From InSAR Fact Sheet: Monitoring Ground Deformation from Space by Rosalind L. Helz
Below are links to each figure in the fact sheet as well as their captions.
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Figure 1. Diagram showing how radar interferometry detects uplift of the Earth's surface. Both the distance between the satellite positions and the amount of uplift (red layer) are exaggerated for clarity. Modified from Zhong Lu, USGS, written commun., 2004. |
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Figure 2. Interferogram (upper image) of the Santa Clara Valley, Calif., showing patterns of subsidence (with local uplift) that occurred from January to August 1997. The shaded-relief map (lower image) translates the color-zonation pattern of the interferogram into three-dimensional topography. Vertical dimension is greatly exaggerated. From Galloway and others, 2000. |
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Figure 3. Interferogram showing the area of uplift (1997-2001) at the Three Sisters volcanoes (red triangles), in the Cascade Range in central Oregon, based on European Remote Sensing Satellite imagery. In March 2004, a swarm of more than 300 small earthquakes (yellow circles) occurred near this center of uplift. White circles, Global Positioning System stations. From Charles Wicks, USGS, written commun., 2004. |
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Figure 4A and Figure 4B. Interferogram showing deformation fields closely associated with the Nenana Mountain and Denali earthquakes (epicenters at small and large stars, respectively). A,Magnitude 6.7 Nenana Mountain earthquake (October 23, 2002) and paired deformation lobes north and south of the fault. Based on Radarsat images taken on August 16, 2002, and October 27, 2002. B, Magnitude 7.9 Denali earthquake (November 3, 2002) and extensive deformation. Note that each color band (fringe) has twice the value assigned in figure 4A. Based on Radarsat images taken on October 29, 2002, and November 22, 2002. Yellow lines, faults; red lines, ground breaks. From Lu, Wright, and Wicks, 2003. |
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Figure 5. Interferogram showing deformation in the Los Angeles basin, from April 1998 to May 1999, draped over shaded-relief map. Based on European Remote Sensing Satellite imagery. Triangles, Global Positioning System stations. Modified from Bawden and others, 2001. |
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Figure 6. Interferogram showing deformation of Akutan Island (August 1993 to October 1996), draped over shaded-relief map of the island. Based on European Remote Sensing Satellite imagery (C-band radar). From Lu and others, 2005. |
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Figure 7. Interferogram showing deformation of Akutan Island (October 1994 to June 1997), draped over shaded-relief map of the island. Based on Japanese Earth Resources Satellite imagery (L-band radar). From Lu and others, 2005. |
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Figure 8. Photograph showing a small graben west of the summit of Akutan Volcano. Note unconsolidated surficial material and sparse vegetation. Photograph by John Power, USGS, August 2001. |