On the feasibility of tsunami detection using satellite-based sea surface roughness measurements

Observations of tsunamis away from shore are critical for improving early warning systems and understanding of tsunami generation and propagation. Using analysis already applied to the 2004 Sumatra-Andaman tsunami, we positively identify the 2010 Chilean tsunami in satellite altimeter measurements of sea surface roughness. Use of radar backscattering strength measurements from satellite altimeters would be impractical for tsunami detection and early warning purposes due to the limited temporal and spatial resolution. On the other hand, it is likely that tsunami-induced changes in sea surface roughness are observable with other types of space- and airborne sensors that sense sea surface roughness over much wider swaths. With this in mind, we explore the feasibility of using existing instruments and technology as the basis for a tsunami detection and early warning system.