24. Dispersion of Love Waves along Various Paths to Japan (Part 1)

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The dispersion characters of Love waves along various paths to Japan were investigated by using the seismograms recorded by Columbia-type ultra-long period seismographs at Tsukuba Station, Japan. For the oceanic paths, the dispersion characters were classified into five groups, from I to V. In the central and northern Pacific region, Love waves show the purely and nearly oceanic dispersion character of I and II respectively (Fig. 1,2). When travelling path comes into the Micronesia region, however, they show a remarkable shift to a continental one with the shift of the path to the west (Fig. 3, 4). This phenomenon is quite similar to that observed in Rayleigh wave dispersion. Two unexpected results were obtained. That is, 1) clearly dispersive Love wave trains hardly transmitted along the paths which cross the Mariana Sea (Fig. 6), and 2) the shocks which took place in the continent west of Japan did not transmit long-period dispersive trains of Rayleigh waves (Fig. 8). The dispersion character of Love waves along the oceanic path from Sumatra Island region to Japan was as continental as those along the path from Outer Mongolia or the Sinkiang region to Japan (Fig. 9). The dispersive characters along the continental paths were classified into five groups (from VII to XI). An interesting result was that the maximum group velocity of Love waves decreases remarkably when Love waves pass in or around the Tibet region (Fig. 12). Such a dispersive character may be explained by the special conditions not only in the earth's crust but also in the upper mantle along this high mountain region.|前にレーリー波について調べたのと同様に,地震研究所の筑波支所におかれているコロンビア型地震計の記象を用いて,日本の周辺を伝わるラブ波の分散を調べた.
1962-03-15

24. Dispersion of Love Waves along Various Paths to Japan (Part 1)

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