Slashdot Mirror
An Early Warning System For Earthquakes
Iphtashu Fitz writes "Would 15 seconds be enough warning time to prepare for an earthquake? It certainly wouldn't be long enough to evacuate from where you live, but it may be just long enough to get out of a building or brace yourself in a doorframe or under a solid desk. Italian scientists may have discovered a way to measure the initial shockwave of an earthquake two seconds after it starts, and from it predict the extent of the destructive secondary wave that will follow. It typically takes twenty seconds for the secondary wave to spread 40 miles, so sensors that can transmit warnings at the speed of light may provide just enough warning before a major quake for people to brace themselves. Even more importantly, such a warning could allow for utilities like gas companies to close safety valves, preventing potential fires or explosions in the aftermath of the quake."
"1985, Mexico City, buildings collapsed when the center of the earthquake was 400 km away. That one was unusual but it shows what's possible."
No, it shows what Mexican building codes are like.
Of course more time would be better. However, nearly everything important can be done in 15 seconds. The really critical things. Like getting the generators at the hospital up to keep the ICU running. Closing gas mains. Taking the scapel out of the guys brain during surgery.
You can't drive home from the grocery store and strap yourself into bed in 15 seconds, but you can do a lot of really really important things in that time.