P-EEWSP wave Earthquake Early Warning System
- EEWS is an earthquake early warning system using P wave information before S wave or surface wave, which can cause massive damage, is arrived.
- Anticipating the following peak seismic motion with analysis of the P wave information
- Offering the ready time for corresponding actions (From several seconds to dozens of seconds depending on the epicentral distance)
Basic principle mimetic diagram of EEWS
Note Seismic wave velocity P wave: 5~8km/s, S wave: 3~4km/s (P wave is about 1.73 times faster)