NASA / JPL / ESA / SCIENCE PHOTO LIBRARY NASA / JPL / ESA / SCIENCE PHOTO LIBRARY
Earthquake. Coloured satellite radar interfero- metry image of the Hector Mine earthquake of 16th October 1999 in California, USA. The coloured bands are contours, each colour cycle indicating 10 centimetres of ground displacement, increasing towards the fault (upper centre). This earthquake measured 7.1 on the Richter scale. The black line at upper left is the unrelated Landers fault. Radar measurements were taken before (15th Septe- mber) and after (20th October) the event by the European Space Agency's European Remote Sensing-2 (ERS-2) satellite. This technique allows movements as small as one millimetre to be seen, aiding research into where and how earthquakes occur.
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