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View Full Version : Discussion: ESA Watches Earthquakes Shake the Sky



Fraser
2003-Nov-03, 11:21 PM
SUMMARY: When a powerful earthquake shook the ground in Alaska a year ago, it also set the Earth's atmosphere shaking. A team of European scientists used the Global Positioning System to map disturbances in the Earth's ionosphere after a 7.9 magnitude earthquake struck Denali, Alaska. The ionosphere starts at 75 km and goes up to 1,000 km altitude, and it amplifies any disturbance that happens on the ground beneath it - one millimeter disturbance on the ground could become a 100 metre oscillation at 75 km altitude. This gives scientists a new tool to track earthquakes around the world.


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