Skip to main content
Earth, Planets and Space
Fig. 1. | Earth, Planets and Space

Fig. 1.

From: Nonlinear site response evidence of K-NET and KiK-net records from the 2011 off the Pacific coast of Tohoku Earthquake

Fig. 1.

(a) K-NET stations at the Miyagi prefecture. The black dot represents the epicenter of the mainshock and the rectangle represents the projection of the fault plane on the surface (Simons et al., 2011). The color of stations is related to the Vs30 of each site and the size is related to the PGA level. Station CHB024 in Chiba, near Tokyo, is also shown. (b) Fourier spectral ratios (geometric mean of horizontal components) of Miyagi stations with respect to MYG011, which is considered the reference site (Vs30 = 1400 m/s). Note the strong deamplification at high frequencies (between 5 and 10 Hz) for sites having Vs30 below 400 m/s. Furthermore, the amplification at low frequencies (less than 1 Hz) is quite large.

Back to article page