. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 242 hepout—1884. I fim glad to liavc it in my power to say are now being published by tlie Seisnioloffical Sociiefy. The results-wbicli these obsorvations have ^iven, al(honi,'h in certnin cases only eonfiiinatory of previons observaiions, may be epitomised as follows :— 1. Out of the ;iH7 shocks, 2o4 have been local, the area shaken in some cases not exceedinfj .^n s(iu
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 242 hepout—1884. I fim glad to liavc it in my power to say are now being published by tlie Seisnioloffical Sociiefy. The results-wbicli these obsorvations have ^iven, al(honi,'h in certnin cases only eonfiiinatory of previons observaiions, may be epitomised as follows :— 1. Out of the ;iH7 shocks, 2o4 have been local, the area shaken in some cases not exceedinfj .^n s(iuiu'(! miles. 'I'lie remftinini^ 13.'J disturb- ances each shook an area with an jiverage diameter of 45 miles. A few of the larger shocks shook an area the radius of which Avas at least 150 miles, As the latter originated far out at sea their efTeets on the land Avere small. At least fifteen cases have occurred when an earthquake lias been practically felt at the same time over two distant areas—obser- vera in the intermediate areas not having felt any disturbance. The distance between such areas has been as much as 150 miles. 2. The area where the most earthquakes have been felt is along the line of the Toncgawa, especially near its month, which is ono of the flattest parts of Japan. Is^o less than eighty-four jier cent, of all the earthquakes observed have originated beneath the Pacific Ocean, or on the land close to the sea-board. The volcanic regions of Japan and the mountainous districts arc sin- gularly free from earthquakes. Unless an earthquake is very severe it invariably grows feebler as it approaches the mountains and then dies out without crossiug them. The mountains referred to are broad ranges, having i)caks from 6,000 to 10,000 feet in height. In many respects the distribution of seismic activity in Japan holds a close relationship to the distiibtition in South America. In the centre of Japan we have high mountain ranges consisting of granite, metamorphic
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
