The YUZ is situated in the northern part of the Pyongnam Basin, in the eastern part of the Sino–KoreanCraton and extends to northeast for a distance of about 80 km and a width of about 8–45 km (Fig. 1a).It is adjacent to three zones of subsidence (the Tokchon–Maengsan to the west, the Kowon to theeastand the Junghwa–Samdung to the south) and the Rangnim Massif to the north (Fig. 1b).
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