Valmiki Ramayana Yuddha Kanda Sarga 69 Shloka 38

क्ष्वेळिडितास्फोटितः by the sound of clapping of arms, रक्षसाम् Rakshasas, सिंहनादैः lion roar, संस्फोटितइव as though breaking like अम्बरम् sky, निनदैः by the roar, वसुन्दरा earth, चचाल shook.

By the sound of their clapping of arms and their lion roar it was as though the sky was breaking and the earth was shaking.