Pressurized, the heated water returns to the surface along two fault lines-the Chinshan Fault and the Kanchiao Fault-and ushers forth as hot springs. The Peitou and Yangmingshan areas have a dozen wellheads, and these have supported hot spring culture through its long history.
熱水受到壓力，沿著兩條主要的金山斷層和崁腳斷層上湧，最後衝出地表形成溫泉露頭，今天光是北投、陽明山一帶就有十幾處泉源，發展溫泉文化的歷史悠久。