This is the second of three narrated demonstrations of seismic resonance and why certain buildings fall during earthquakes. Dr. John C. Lahr, USGS emeritus seismologist, demonstrates the concept using three different methods. For a description of the activity: http://www.iris.edu/hq/resource/boss_lite_building_resonance
From: http://www.iris.edu/hq/programs/education_and_outreach/animations
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