California tests natural disaster early warning system

Scientists are using GPS technology and other sensors to detect the impending threat of natural disasters.
The network is installed in Southern California and has already helped scientists to alert emergency services to the risk of flash floods.
Yehuda Bock from the Scripps Institute of Oceanography said: "This can help to mitigate threats to public safety."
And added: "It means real-time information can be made available."
Ground motion
The minutes and even seconds before a natural disaster strikes are crucial. read more