Locating the precise sources of high-frequency microseisms using distributed acoustic sensing
Abstract Although microseisms have been observed for more than 100 years, the precise locations of their excitation sources in the oceans are still elusive. Underwater Distributed Acoustic Sensing (DAS) brings new opportunities to study microseism generation mechanisms. Using DAS data off the coast of Valencia, Spain, and applying a cross-correlation approach, we show that the sources of high-frequency microseisms (0.5-2 Hz) are confined between 7 and 27 km offshore, where the water depth varies from 25 to 100 m. Over time, we observe that these sources move quickly along narrow areas, sometimes within a few kilometres. Our method with DAS data allows characterizing microseisms with a high spatiotemporal resolution, opening a new chapter in understanding these global and complex seismic phenomena happening in the oceans.