Hello how may I help you? What was the loudest sound ever recorded? The loudest sound ever recorded was "The Great Boom of Manitoba" which registered 150db What made the noise? The largest tree ever seen toppled in a fierce thunderstorm When did this happen? This happened in 1952. How did they measure sound back then? They had the same technology we have now. That's been around since 1902. Thanks Bot! You're very knowledgeable. You're very welcome!