Fig. 1From: Source area of the 1858 earthquake swarm in the central Ryukyu Islands revealed by the observations of Father Louis FuretMap of French residences and JMA intensity observation points in Naha, Okinawa Island. Yellow circles show the French residences. Red rectangles show the JMA intensity observation points. Red annotations denote the observation periods for the JMA points. National Land Numerical Information data provided by the Geospatial Information Authority of JapanBack to article page