Ask the Expert #1: How does SeismicAI EEW alert on offshore earthquakes?
Our Seismology Experts – at Your Service #1
Featuring: Dr. Andreas Samuel Eisermann, a Seismologist at SeismicAI, who holds a doctorate from Universität Stuttgart Institute of Geophysics, and a post-doctorate from Tel Aviv University, where he headed the Real-Time Seismology Laboratory.
Question:
Over 80% of large earthquakes occur near the Pacific Ocean, often causing tsunamis and destroying nearby communities and critical facilities. How does SeismicAI Earthquake Early Warning (EEW) system detect and alert on offshore earthquakes?
Dr. Eisermann:
Detection of the precise location of the earthquake is critical for calculating the effect on each location. With traditional systems, in areas outside the seismic network, the precision of the earthquake’s location drops quickly as the distance from the network grows – and distance errors cause magnitude errors and distort the regional Predicted Ground Shaking (PGA).
SeismicAI’s regional algorithm utilizes arrays (local clusters of four sensors) that enable accurate identification of earthquake locations anywhere in the world, including offshore. SeismicAI’s Array seismology provides back azimuth information as well as S-phase triggering, which are much stronger constraints for the location than data obtained from standard single-sensor seismic networks.
Moreover, Arrays allow us to locate the earthquake much faster, using only two stations, hence providing an earthquake early alert with more warning time.
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