App challenge: what if you knew an earthquake will hit 5 seconds from now?
![By J.K. Nakata, U.S. Geological Survey [Public domain], via Wikimedia Commons](https://www.tellusventure.com/images/2017/12/loma_prieta_quake_damage.jpg)
The biggest natural disaster threat to Californians comes from earthquakes, wild fires notwithstanding. One quake can take out more homes, businesses and infrastructure in a few seconds than all of this year’s fires combined. There’s no scientifically valid way of predicting earthquakes, so most people assume they strike without warning.
Not so. Earthquakes run for many seconds, even minutes. The first vibrations that ripple out are called P-waves, which seldom do damage but carry critical information about location and intensity several seconds ahead of the big shake.… More
 
					
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