DR. MARSHALL'S VIEWS.
(srKCIAL TO '"THE TWSSS.")
DUNEDIN. April 21. Dr. P. Marshall, Professor of Geology at the University, gives the following observations: —Tht> regions of the earth's crust mest frequently shako a by earthquakes arc all situated on tlio e-teep slopes of the earth's crust, extending from the summit of the mountain range to the bo:torn of the oceanic depths. San Francisco is situated in the middle of one of the most pronounced of the so slopes, and has b?en known to be subjtct to earthquakes sine? its foundation. These steep slopes aro eminently unstable regions of the earth's crust, for they owe their formation, to imnien-«o lateral pressure resulting from tho efforts ot iho solid cru.st of the earth to adjust itself to cooling. Strains are thus sot up in the overcome the resistance of the solid rocks, a fracture is formed, and fhe rocks on one side of it slido past thoeo on the other until the strain is relieved. Usually relief is afforded by sudde i jumps, and the movement is a series of jerks, each of which ge-nerates earthquake- shocks. The first movement is generally the largest, and the shock it caufete is the worst.
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Bibliographic details
Press, Volume LXII, Issue 12485, 23 April 1906, Page 8
Word Count
200DR. MARSHALL'S VIEWS. Press, Volume LXII, Issue 12485, 23 April 1906, Page 8
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