Valmiki Ramayana Yuddha Kanda Sarga 22 Shloka 38

तस्मात् from that, दारुणः terrific, अवधारणशब्दः the sound that was produced, समपद्यत crack caused, तद्बाणनिपातेन by the act of letting off the dart, कुक्षिषु in the cavities, त्वपः water, अशोषयत् dried up.

A crack caused in the ground by letting off the dart produced terrific sound and by that, the water in the cavities of the ground dried up.