Seismic and Infrasound Signals from the 2004 Sumatra-Andaman and the 2011 Tohoku-Oki Tsunamis

摘要

The great earthquakes of 26 December 2004 (magnitude 9.3, Sumatra-rnAndaman) and of 11 March 2011 (magnitude 9.0, Tohoku-Oki, Japan)rncaused tsunamis and atmospheric infrasound waves. We observedrnseismic signals at coastal stations caused by tsunamis and infrasoundrnsignals caused by displacements of the sea surface at the epicenter. Wernlocated the tsunami sources from the infrasound travel times. Since therninfrasound wave is travelling faster than the tsunami, it is for warningrnpurposes very intriguing to study the infrasound generation directly atrnthe earthquake source. We suggest that a denser network of infrasoundrnstations may be helpful for tsunami warnings.