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Ambient noise interferometry is an effective approach to studying temporal crustal behaviors through continuously measuring crustal seismic velocity changes (dv/v). However, the interpretation of such dv/v variations is not straightforward because both internal (tectonic/magmatic) processes of the crust and external (environmental) factors could affect dv/v simultaneously. The relationship between these potential factors and crustal dv/v is complicated and varies from place to place globally. Understanding the interplay between the internal and external processes in dv/v variations becomes an essential step toward accurate crustal monitoring. As an active orogenic belt in the subtropical zone, Taiwan is one of few places in the world that features strong interactions of both environmental and tectonic processes, with distinct dry and wet seasons and high seismicity rates. To investigate the temporal evolution of crustal …