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Spring-Pendulum Seismometers

Categories: Science
Added: Wed Feb 22 22:34:37 +0000 2006Views: 12,206
Rating: 3.31 (13 votes)
MoonquakesMajority of Earthquakes & Volcanic Eruptions >
Submitted by fun-facts
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Before electronics allowed recordings of large earthquakes, scientists built large spring-pendulum seismometers in an attempt to record the long-period motion produced by such quakes. The largest one weighed about 15 tons. There is a medium-sized one three stories high in Mexico City that is still in operation.


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