Digha Nikaya 1:560
SUJATOPuna caparaṁ, ānanda, yadā tathāgato anuttaraṁ dhammacakkaṁ pavatteti, tadāyaṁ pathavī kampati saṅkampati sampakampati sampavedhati.
Furthermore, when the Realized One rolls forth the supreme Wheel of Dhamma, the earth shakes and rocks and trembles.