This animation depicts a time-series of ground deformation at Mount Etna Volcano between 1992 and 2001. The deformation results from changes in the volume of a shallow chamber centered approximately 5 km 3 miles below sea level.

This frame from an animation depicts variations in surface elevation resulting from the discharge and recharge of groundwater basins in Southern California.

This image of California Hayward fault is an interferogram created using a pair of images taken by ESA ERS-1 and ERS-2 in June 1992 and September 1997 over the central San Francisco Bay in California.

This figure shows a comparison of interferograms from four different years mapping the rapid ground subsidence over the Lost Hills oil field in California.

A magnitude 6.6 earthquake struck a sparsely inhabited area of southeast Iran on March 14, 1998, at 11:10 p.m. local time.