. Natural science: a monthly review of scientific progress. in Japanese. The Mino-Owari Earthquake of 1891.—This great earthquake, oneof the most disastrous within historic times, occurred on October 28,at (mean time of 135 degrees E.). The area disturbed by it,including both land and sea, was not less than 320,000 square boundary and the principal isoseismal lines2 are shown inFig. 1. In the region enclosed by the first isoseismal, the destructionof buildings was nearly complete; in the area of the second isoseismal, 2 Isoseismal lines are lines of equal intensity of the e
. Natural science: a monthly review of scientific progress. in Japanese. The Mino-Owari Earthquake of 1891.—This great earthquake, oneof the most disastrous within historic times, occurred on October 28,at (mean time of 135 degrees E.). The area disturbed by it,including both land and sea, was not less than 320,000 square boundary and the principal isoseismal lines2 are shown inFig. 1. In the region enclosed by the first isoseismal, the destructionof buildings was nearly complete; in the area of the second isoseismal, 2 Isoseismal lines are lines of equal intensity of the earthquake force. i895. THE AFTER-SHOCKS OF EARTHQUAKES. 393 houses, walls, bridges, etc., were partially damaged ; in that of thethird, walls were cracked, clocks were stopped, and crockery fell offshelves; while between the third and fourth isoseismals the shockwas distinctly felt. The first of these areas, which includes theprovinces of Mino and Owari, and portions of those adjoining, ismapped on a large scale in Fig. 2. The continuous lines marked 1. Fig. 2. Area of First Isoseismal of Mino-Owari Earthquake. and 2 are isoseismal lines, along which the maximum accelerationswere respectively 2,000 and 800 mm. per second. The shaded area isthat which was shaken most strongly. The dotted lines will bereferred to in a later section [see p. 397). Within the shaded area will be noticed a somewhat sinuous marks part of the course of the great fault-scarp, which has beenadmirably studied and described by Professor Koto. He succeeded in 2 394 NATURAL SCIENCE. June, tracing it from Nishi-katabiri to Haku-san, a distance of 40 miles,and there is good reason for believing that it extends as far as Fukui,, for a total length of 70 miles. Proceeding in a general south-eastand north west direction, it cuts through hills and plains alike. Withone exception, the ground on the north-east side is relatively depressed,and it is also constantly shifted by as much as 5 or 6 feet to
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