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6min chapter
Seismology
In Our Time: Science
What Are the Earliest Seismometers?
The Lisbon earthquake set off the first notable steps toward understanding what was going on with earthquakes and initiating seismology. The big step forward in understanding what happens during an earthquake was the 1906 earthquake in San Francisco. Thanks to all of these surveys, scientists now can take all of that information and begin to build maps of the intensity of the event. Do we now know what happened at Lisbon? There are some suggestions it might have been up to an 8.5 magnitude. We get very large earthquakes where we have a process called subduction which is where one tectonic plate gets pushed deeper into another. That's why we see primarily we see these earthquakes at the plate boundaries.
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