Infrasound Monitoring for Disaster Prevention from Geophysical Perspectives.

Abstract Infrasound refers to pressure waves occurring below the audible frequency range for humans. These low-frequency waves serve as a viable long-distance remote sensing technique to monitor potentially destructive geophysical events like earthquakes. In the context of tsunamis triggered by significant oceanic earthquakes, employing this monitoring method becomes crucial for disaster prevention due to the faster propagation of infrasound compared to natural tsunami waves. Detecting a sudden atmospheric pressure surge within the infrasonic frequency range subsequent to identifying a massive earthquake through accelerometers could serve as an indicator of imminent large tsunami waves along the shoreline area between the earthquake's epicenter and the observation site. This detection could then be utilized as a triggering mechanism for timely evacuation measures.