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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Unified approach for evaluation of horizontal site amplification factors with special reference to history of studies on the effects of surface geology on seismic motion

Fig. 8

Observed seismograms during the foreshock of the 1930 Kita-Izu earthquake of M7.3 at the University of Tokyo (after Imamura 1931). Mainshock records were all off-scale. We can see a very prominent phase of surface waves in the later part (from about 4 times the S-P time), especially in the NS component

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