Earthquake warning systems based on earlier works about the delay time between two seismic waves. The first waves are called P waves, often creating strong impact shock. Earthquake damage from strong waves to the following, called S-wave warning device will detect P waves and send warning signals before transmission to S waves. Signals can come soon from several seconds to a minute, but enough to suspend the operation of the train, surgeries and help people find shelter.
Smartphones can warn earthquakes
Earthquake with tsunami devastated Chile in March 4/2012. (Photo: Juan González-Carrasco)
"A few seconds can also be very useful," Live Science quoted lead author Sarah Minson, experts from the US Geological Survey said.
If the GPS system in the phone sudden vibration in the same direction, the probability of an earthquake almost none. But if several thousand phone along with this phenomenon at the same time, the possibility of an earthquake is about to be very high. From the data obtained on the movement of the ground, the device determines the position and intensity of the earthquake, then send a warning signal.
For earthquake level 7 or more, the GPS sensor in your smartphone can give warnings in seconds. Expert Group test system with computer models to determine the level 7 earthquake fissures along the Hayward in California, USA, and check the GPS data from the Tohoku earthquake earthquake in Japan in 2011. Data Data from smart phone to detect signs of a shift cm.
This year, they intend to field trials in Chile. However, the biggest obstacle is that scientists need access to the raw GPS data warehouse, which the manufacturer of the device is not allowed. In addition to traditional phone alerts, the number of people near the epicenter must be at least several hundred.
