It was very sharp and rumbled and all the mountains were rumbling with it. A hissing or rumbling sound was sometimes reported. As spring arrives, Walden and the other ponds melt with powerful thundering and rumbling. Loud rumbling sounds were also felt and heard from the volcano island. Asian elephants use chirps that are different from African elephants' deep rumbling noises. The elephant herd were all rumbling loudly. It is a synth-pop song with flashy harmonies, murky synths and rumbling beats. With the ashfall came darkness and the sounds of lahars rumbling down the rivers. The sound is usually described as a rumbling sound. The rumbling sound of the attacks was heard in Singapore. The rumbling sound is partly due to these reflections. Rumbling sounds were also heard by residents of Brgy. There are occasional earthquakes and ever and again the dark rumbling of the sea. Large doses can cause nausea and stomach rumbling. They are often employed in movie theaters to recreate rumbling bass effects, such as explosions.