2024-03-30T01:57:50Z
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2022-12-19T04:08:46Z
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Theoretical Strain Seismogram and Its Applications
理論歪地震記象とその応用
岡田, 義光
129030
453
application/pdf
Analytical expressions of dynamic strains and tilts on the surface of a semi-infinite medium due to a buried shear fault are derived with Cagniard's method. The essential difference compared with the solution in an infinite medium is the appearance of SP and Rayleigh waves in a semi-infinite case. Some examples of strain and tilt waveforms are illustrated and the features of each phase are investigated. For a point source, the amplitude of SP phase is comparable to that of P phase. For this reason, attention must be payed when one analyzes strain records using the solutions in an infinite medium, especially in the case of a shallow focus. For a moving source, if it propagates towards the observing point, the resultant SP phase becomes far larger than P phase by a kind of Doppler effect. Except for the cases mentioned above, the solution calculated in an infinite medium gives generally a good approximation to the exact solution in a semiinfinite medium, at least where the initial parts of waveforms are concerned.
departmental bulletin paper
東京大学地震研究所
1980-08-25
application/pdf
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
1
55
101
168
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/33086/files/ji0551007.pdf
jpn