How does Mexico's "Earthquake Early Warning" system work?
In 1985, a Great, magnitude 8.1 subduction zone earthquake occurred beneath the coast of Michoacan Mexico. Despite the 350-km distance from the earthquake epicenter to Mexico City, most of the 9,500 fatalities occurred there. That earthquake prompted Mexico to develop an earthquake alert system for all of Southern Mexico. This animation describes the tectonic and geologic process that affect the region, including concepts like magnitude, basin amplification, and building resonance.
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Mexico City was affected by:
- Amplification of surface waves due to sediment filled basin.
- The specific resonance of medium-height buildings.
- Weak structures