Fig. 4From: Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, JapanChanges in the strain observed using the 1500-m laser strainmeter (blue). The waveform nearly agrees with the theoretical tides (green) but with a slightly smaller amplitude. The theoretical tides downscaled by a factor of 13% (red) are consistent with the topographic effects previously observed using the 100-m strainmeter located at the same Kamioka siteBack to article page