Fig. 2From: Triangulation scale error caused by the 1894 Shonai earthquake: a possible cause of erroneous interpretation of seismic potential along the Japan TrenchFirst-order triangulation network in Japan except for Hokkaido. Dense networks with gray circular background indicate the locations of baselines. The network shown by red color was measured until October 1894 while the blue network was measured after October 1894Back to article page