Possible linkages between microseisms in the Andaman-Nicobar region and swells in the South Indian Ocean

摘要

Microseism source characterization and its genesis play a key role in linking microseism records to prevailing atmospheric and oceanic conditions. In the present study, we analyzed the spatial and temporal distribution of microseisms in the Andaman-Nico-bar region using ocean-bottom seismometers and nearby continental stations data for the deployment period of January-April 2014. We attempted to establish a linkage between microseisms and ocean wave parameters derived from the ERA5 dataset. The short-period secondary microseisms (2-5 s) show a marked difference compared with long-period secondary microseisms (6-10 s) and are associated with local climatology and geomorphology. In contrast, long-period microseisms are related to distant sources in the South Indian Ocean. The primary microseisms (11-20 s) are weak in the Andaman region and do not correlate with any ocean wave parameters.