In 1998 researchers realized that the earth constantly hums. Long years of research have finally allowed measurements to be taken on the ocean floor. “The study determined Earth’s natural vibration peaks at several frequencies between 2.9 and 4.5 millihertz… Deen and her co-authors believe other researchers can apply their findings to better model the structure of the Earth’s interior.” Which, in other reports, researchers have insisted in not hollow, except for those voids where it is.
