Tsunami Prediction and Early Warning

Figure 1: Sketch of tracking tsunami-genic earthquakes with seismic antennas. The upward motion of the seafloor excites the tsunami wave during a megathrust earthquake that occurred at the subduction interface. The orange and green arrows indicate the plate motion of the subducting slab and the overriding plate. The growth of the earthquake rupture is imaged by the regional onshore seismic networks (red triangles).

A natural extension of Array-based earthquake early warning is to perform the similar processing at large spatial scale and longer time span for tsunami warning. The idea is to use real time BP and develop simple source model as an input of tsunami simulation to predict arrival time and coastal run-up height. We are able to demonstrate the ideas with case studies of megathrust earthquakes such as the 2011 Tohoku-Oki earthquake, 2014 Iquique earthquake and 2015 Illapel earthquake (An and Meng., GRL, 2016). This research will facilitate the warnings of future tsunamis in regions vulnerable to near-field tsunami hazard around the world.