When aftershock data is available, the corresponding maps and charts include earthquakes within 100 miles and seven days of the initial quake. All times above are Japan time. Shake data is as of ...
SHIMANE—A Japanese academic has discovered a map published in the United States in 1897 that marks Takeshima, a group of islets claimed by both Japan and South Korea, as Japanese territory.
First, he uses contour maps produced by the Geospatial Information Authority of Japan, upon which he overlays useful details based on his own research. This creates an abundance of information ...