Smartphone app to give earthquake warning
Researchers from the University of California showed off the project this week at a conference on how to use technology to ward off natural disasters. The app is based on technology used in an early warning system prepared by a team under Professor Richard Allen, director of the UC Berkeley Seismological Laboratory.
California has already embraced the concept of an early warning network, with Governor Jerry Brown signing a bill in September mandating the creation of a system. The smartphone app is capable of providing an alert between a few seconds and one minute before a tremor hits, depending on where an individual using it is in relation to the epicentre.
To do this, the app captures initial energy from the tremor, the so-called P wave or primary wave, which rarely itself causes damage. The technology uses algorithms to detect rapidly when a quake is starting and determine its strength and location and when it is likely to reach its zenith and alert residents in potentially affected areas. The algorithms use data from regional networks monitoring seismic networks.
In the case of cell phones, those located at the actual epicentre of the quake will not receive the early warning. But the tremors detected by the system will be transmitted in a chain to other receivers so that those a few kilometres (miles) away will be able to react to cloud-based data and glean more information on what is happening where and what is likely to happen next.
The warning gives people precious time to seek out a secure place of refuge and halt industrial activity or transport, thereby reducing risk to the public at large. The app uses various smartphone functions such as accelerometers and gyroscopes to determine movement, as well as GPS and Wi-Fi localization functions as well as a magnetometer to indicate direction.
The software makes use of the fact that there are 16 million smartphones in California alone and about one billion globally that are ever more interconnected. ■