25,410 science & technology articles

Field study shows possibility of deflecting seismic waves around desired geologic surface areas

Posted on April 10, 2014

(a) Scheme of the testing device for seismic metamaterials. An oscillating probe generates acoustic waves at 50 Hz in front of a mesh of cylindrical boreholes. An array of sensors monitors the intensity of the waves at various positions. (b) Experimental results. The map (black rectangles: sensors; white circles: boreholes; red cross: source) plots the difference of energy after and before drilling the boreholes. The dark blue region behind the holes indicates that the presence of the borehole mesh results in a decrease of elastic energy transmitted to that area. The red region indicates the area close to the source in which the wave intensity increases because of reflection. Credit: S. Brûlé et al., Phys. Rev. Lett. (2014)   A team of researchers in France has successfully demonstrated small-scale reflection of seismic waves around a desired geological area. In their paper published in the journal Physical Review Letters, the researchers describe an experiment they conducted at an outdoor site to test whether lessons learned in creating cloaking devices using metamaterials (and other techniques) might be applied to seismic waves generated by earthquakes.
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Massive Earthquake off the Coast of Chile Triggers Tsunami Warnings in the Pacific

Posted on April 3, 2014

An 8.2-magnitude earthquake off the coast of northern Chile on April 1, 2014 was followed by at least a dozen significant aftershocks, including one with a magnitude of 6.2. This activity initially generated tsunami warnings across the Pacific, but the warnings were later canceled except for the coastal regions of Chile and Peru, according to NOAA’s Pacific Tsunami Warning Center.
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Model Provides a 3-D Look at L.A.-area Quake

Posted on April 2, 2014

On March 28, residents of Greater Los Angeles experienced the largest earthquake to strike the region since 2008. The magnitude 5.1 quake was centered near La Habra in northwestern Orange County about 21 miles (33 kilometers) east-southeast of Los Angeles, and was widely felt throughout Southern California. There have been hundreds of aftershocks, including one of magnitude 4.1.
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