2022-08-16T04:50:23Zhttps://repository.dl.itc.u-tokyo.ac.jp/oaioai:repository.dl.itc.u-tokyo.ac.jp:000350482021-10-01T08:04:57ZOn the Correlation of the Activity of Seismic Zones in Japan地震帯の相互の活動に就て高山, 威雄135163453application/pdfThe sudden change of the sense of correlation is frequently noticed in meteorological and seismological phenomena in Japan. There are cases in which the parallel change of some two elements for some five or six years is followed by the succession of the inverse change for another few years-then again the parallel change. Such a phenomenon was hitherto considered generally to be meaningless, because by calculating the correlation coefficient, we reach at a very low value of correlation. From the calculation of probability in the present paper, however, it is inferred that though the correlation coefficient is small in the above case there must exist some physical relation between these two elements if the phenomenon occur repeatedly in time or in space. The seismic activities in some seismic zones in Japan were formerly found to have correlation between each other by those aiithors as the late Prof. F. Omori Messrs T. Hirano, K. Suda, K. Shiratori, and K. Wadati. In the present paper the seismic activities of all seismic regions in Japan for the last ten years were examined and the correlation or non-correlation between them, not in the old but in the new sense of correlation, was determined.departmental bulletin paper東京帝国大学地震研究所1928-03-28application/pdf東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University417AN0002969900408972https://repository.dl.itc.u-tokyo.ac.jp/record/35048/files/ji0040001.pdfjpn