Abstract
THE vibration of the earth may be caused by volcanic eruptions and earthquakes, but it is doubtful if any regular pulsation can be called forth by a sudden impulse sudr as an earthquake or paroxysmal outbursts of volcanoes. If any rhythmic pulsation ever comes into existence, it is most probably due to some exciting cause of long duration, such as volcanoes of continuous activity giving rise to occasional explosions, thus causing frequent blows to the earth. The eruptions of Krakatoa afford an example of such a method of excitation, and we have reason to believe that there were pulsations with a period of about 67m.
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NAGAOKA, H. The Eruption of Krakatoa and the Pulsation of the Earth . Nature 76, 89–90 (1907). https://doi.org/10.1038/076089b0
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DOI: https://doi.org/10.1038/076089b0