Nautical charts . FIG. 36. MAPS OF BOGOSLOF ISLAND, 1895 AND 1907, SHOWING CHANGES DUE TO VOLCANIC ACTION. (105). Need for Revision 109 north channel. The southern point of the entrance,Clatsop Spit, has built out about the same distance. Volcanic action in well authenticated cases hascaused islands to rise or disappear. In the presentlocation of Bogoslof Island in Bering Sea the earlyvoyagers described a sail rock. In this position in1796 there arose a high island. In 1883 another islandappeared near it. In 1906 a high cone arose betweenthe two, and a continuous island was formed overlijr mil
Nautical charts . FIG. 36. MAPS OF BOGOSLOF ISLAND, 1895 AND 1907, SHOWING CHANGES DUE TO VOLCANIC ACTION. (105). Need for Revision 109 north channel. The southern point of the entrance,Clatsop Spit, has built out about the same distance. Volcanic action in well authenticated cases hascaused islands to rise or disappear. In the presentlocation of Bogoslof Island in Bering Sea the earlyvoyagers described a sail rock. In this position in1796 there arose a high island. In 1883 another islandappeared near it. In 1906 a high cone arose betweenthe two, and a continuous island was formed overlijr miles long and 500 feet high. The latest report(September, 1907) was that this central peak had sud-denly collapsed and disappeared. Bogoslof is an activevolcano, and the main changes have been the resultof violent volcanic action. The history of this islandfor over a century past forms a remarkable record ofviolent transformations in the sea. Earthquakes sometimes cause sudden displacements,horizontal or vertical, of sufficient amount to affect theinformation shown on the charts. A careful investiga-tion of th
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