Observed strain data, strain steps, and distance steps for earthquakes that occurred in 2007. The strain data from the Noto earthquake (a-1), enlarged views of the NS (a-2) and EW (a-3) components, and distance data (a-4). The green dashes in (a-2) and (a-3) indicate the inclusion of step uncertainty in fringe counting due to large ground motion. The orange dots in (a-4) indicate the occurrence of laser relocking in the ADM. The strain data for the Off Chuetsu earthquake (main shock) (b-1), averaged data for the NS (b-2) and EW (b-3) components, and distance data (b-4). (c-1)–(c-4) show the corresponding figures for the Off Chuetsu earthquake (aftershock) and (d-1)–(d-4) show those for the Sea of Japan earthquake. Because of the poor repeatability of laser relocking, (b-4) and (c-4) show steps larger than those expected from ɛ_NS, whereas (d-4) (without relocking) shows almost the same distance step as (d-2), associated with the Sea of Japan earthquake.