Скачать или смотреть How earthquakes are measured underneath the Seattle Space Needle

The Pacific Northwest Seismic Network operates more than 700 seismic stations across the Pacific Northwest. Their function is to monitor and analyze seismic activity so earthquake alerts can go out in real time. Some of the seismometers are located in schools or fire stations, but the one we visited sits in a very conspicuous place, right near the base of the Space Needle at Seattle Center.

This station, along with all the other stations, records and reports vibrations, distinguishing earthquake-related movements from 'cultural noise' (i.e. vibrations from trucks moving by) in an instant. The data from all the stations is available for all to view on the Pacific Northwest Seismic Network's interactive map.
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