Fig. 4From: RETRACTED ARTICLE: Recovery process of shear wave velocities of volcanic soil in central Mashiki Town after the 2016 Kumamoto earthquake revealed by intermittent measurements of microtremorTime dependence of the peak frequency of the monitored microtremor H/V spectra normalized to the peak frequency at 14:15, December 6, 2016 (see black circle). Red circles indicate the results for the microtremor H/V spectra measured on April 15, April 16, April 17, April 23, May 3, May 5, May 14, May 19, May 22, June 4, August 20, September 13, October 9 and November 6, 2016, respectively; blue circle indicates the result measured on July 28, 2016, during the PS logging test by Yoshimi et al. (2016; 2017)Back to article page