Valmiki Ramayana Yuddha Kanda Sarga 104 Shloka 15

तदा then, राक्षसेन्द्रस्य Rakshasa king's, दारुणः horrible, शब्धः sound, पृथिवीं च earth also, अन्तरिक्षं च even the heavens, दिशश्च quarters, तथा similarly, प्रदिशश्च corners, प्राकम्पयत् trembled

By the horrible sound made by the Rakshasa king, the earth, even the heavens, similarly the quarters and corners trembled.