This QuickTime animation shows the motions of crustal blocks in the Pacific Northwest. The animation was developed by Jenda Johnson and is narrated by Bob Butler. Coastal blocks are being pushed northward by the Sierra Nevada block while the thick and strong crust of southern British Columbia acts as a back stop to this northward motion. A result of significance to earthquake risk is that much of the resulting north-south compression is accommodated by thrust faults in the Puget Lowlands such as the Seattle Fault that is capable of magnitude 7 earthquakes.
This QuickTime animation was developed and is narrated by Jenda Johnson. The animation shows the motion of a GPS station on the leading edge of a continent near a subduction zone during the earthquake cycle. The station is slowly pushed inland as elastic energy is stored in the overriding plate of the subduction zone then rapidly jumps seaward during a great earthquake that also generates a tsunami. This pattern of deformation has been observed during recent great subduction zone earthquakes like the February 2010 magnitude 8.8 Chile earthquake.
This video segment is from the USGS video “Shock Waves — 100 Years After the 1906 Earthquake”. In this video, structural engineers describe failures of structures during past earthquakes and improved methods of structural design to mitigate earthquake damage. Base isolation of San Francisco City Hall is featured.
Link to the entire USGS program is given below.
This video segment shows the contents of a room falling over and causing damage during a “shake table” experiment. The major point to make using this video segment is how contents of typical rooms in houses can injure of kill inhabitants as they fall over or move about during earthquake shaking. Real examples were provided by the Chile earthquake of February 2010. Although most buildings in Chile withstood the earthquake shaking without collapse, many serious injuries and some deaths occurred because furniture, lighting fixtures, air ducts and other materials inside rooms fell on occupants. The lesson is that bookcases, furniture, and lighting fixtures must be fastened to walls and ceilings so they do not fall on occupants and cause serious injuries. This video was developed by the Consortium of Universities for Research in Earthquake Engineering (CUREE), University of California at San Diego, and the Federal Emergency Management Agency.
This video segment shows the contents of a room falling over and causing damage during a “shake table” experiment. The major point to make using this video segment is how contents of typical rooms in houses can injure of kill inhabitants as they fall over or move about during earthquake shaking. This video was developed by the Consortium of Universities for Research in Earthquake Engineering (CUREE), University of California at San Diego, and the Federal Emergency Management Agency.
Video segment showing two model building on a shake table. One model building has no base isolation and shows violent shaking while the model building with base isolation shows much less shaking.
John Lahr (USGS seismologist) demonstrates how to use spaghetti noodles and raisins to model building resonance during earthquake ground shaking. This is a “kid-friendly” version of the wood blocks and dowels BOSS model.
John Lahr, US Geological Survey Seismologist, demonstrating a cheap and kid-friendly version of the BOSS model that shows how buildings of different height oscillate during earthquake shaking.
Video Demonstration of the “Build a Better Wall” classroom activity designed to allow students to experiment with methods to build shear strength into buildings.
This video lecture shows John Lahr (USGS Seismologist Emeritus) describing the BOSS experiment that models oscillations of different height buildings.