《宋史·列传·卷七十七》
但阴在亥时仍然强大，不会立即衰弱。阳气还小，暂时还不能胜阴，所以就发生了地震。
然阴犹强而未即伏，阳犹微而不能胜，此所以震也。
However, yin was still strong at hai time and did not weaken immediately. Yang energy was still small and could not yet defeat yin, so the earthquake happened.