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April 11, 2017

Who feels earthquakes?

Earthquakes are felt by people somewhere on the globe just about hourly (see this USGS list of felt earthquakes in just the last 24 hours). Some places are particularly prone to them–think Japan, Indonesia, Chile, Italy, California–while some stable parts of the continents will go generations, or even millennia, without anyone there feeling any quaking of the ground. But even in, say, California, where “felt” earthquakes occur daily, most individuals go months …


February 18, 2014

How hard has your zip code shaken?

Did you feel it? …Ever? These USGS maps show the highest shaking intensity reported in every zip code throughout the U.S. (and cities of the world) in the past two decades. 1991 – 2012  The USGS’s crowd-sourced Community Internet Intensity Maps, popularly known as “Did-You-Feel-It” maps, have been collecting online surveys of seismic shaking intensity since 1997. There’ve been plenty of quakes in that time, and in 2012 researchers put together …


March 12, 2011

Japan quake felt over >2500km radius

One of the many remarkable features about this planet’s largest quakes (like the one that just happened in Japan) is their truly global effect. Be it the tsunami or seismic waves perceptible and imperceptible, most parts of the planet have been touched significantly by the 8.9. Let’s start with perceptible seismic waves, i.e., ones people don’t need sensitive instruments to detect. The elastic energy released by this earthquake was enough …