Source region of #Taiwan Mw7.4 #earthquake of 6 Feb. has a complicated 3D lithospheric structure: interaction between the Ryuku subduction and accretionary wedge, the accreted Luzon arc (now forming the coastal range), the Philippines plate, and the Taiwan orogenic prism (central range and foothills).
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@RobinLacassin The entire western Pacific is a tectonic nightmare!