《史记·十二本纪·周本纪》
阳气沉伏在下，不能出来，阴气压迫着它使他不能上升，所以就会有地震发行。
阳伏而不能出，阴迫而不能蒸，於是有地震。
When the "yang" qi became dormant at the lower part and could not come out, and the "yin" qi suppressed it so that it could not rise, earthquakes would occur.