河角のマグニチュードと気象庁のマグニチュードとの関係

概要

論文の詳細を見る
In the catalogue of felt earthquakes at Obihiro, it was necessary to give the magnitude for each earthquake. The catalogue published by the Japan Meteorological Agency (JMA), however, does not give specific data before 1926. A table of the magnitudes of the earthquakes from 1885 through 1943 was produced by KAWASUMI. To complete our catalogue before 1926, KAWASUMI's table was useful. However, KAWASUMI's magnitudes needed to be adjusted to JMA's magnitudes. The question of the relations between JMA's magnitudes, M(J), and those of KAWASUMI, M(K), was previously discussed by TSUBOI. After TSUBOI, the difference, M(K)-M(J), was about 0.4 for 42 earthquakes of the magnitude M≧6.0. During the 18 years from 1926 through 1943, there were 512 earthquakes whose magnitudes were documented both by JMA and by KAWASUMI. Using these earthquakes, the relations of both M(K) . and M(J) were expressed as follows : M(K) =0.09{M(J)}^2-0.45M(J)+5.90 According to this equation, the difference, M(K)-M(J), was about 0.1 for M(J)≧7.0M(J) became smaller, the differences became gradually more remarkable.
帯広畜産大学の論文
1974-09-25