Show i WEAK SPOTS IN EARTHS EARTH'S CR CRUST III i I WILL WILL CAUSE EARTHQUAKES y y EUGENE EUGE Ore March 15 By U. U P P. P. Because use th thero ro are aro several es especially especially especially es- es weak places in the crust of the earth earthquakes can be expected to occur for ages to come according to Dr Warren Varrel D D. Smith ge geologist l gist and authority on earthquakes earthquakes earth earth- quakes at the University of Oregon Oregon Ore Ore- pre pre- gon who has y recently been conducting conducting con con- ducting new studies from evidence supplied by recent earthquakes These places are in th the ocean and generally affect the ocean cean bed and and shore lines only Interiors Interiors' df Of great land lanel masses generally more stable are seldom affected by earthquakes earth earth- quakes ho says One of the weak places in the earths earth's surface Is In the Straits of Messina between Sicily and Italy where in 1908 a very destructive earthquake occurred Another Is the tho Junction of the Pacific arc with the tho Indo Maylan arc in the region of Java and the Philippines Some exceedingly devastating earthquakes earthquakes earthquakes earth earth- quakes have taken place In those regions legions Another place is the Chilean Chi Chi- lean coast and still stilt another along alonS' the San Andreas rift in hi California Perhaps the theof most unstable l part of the earths earth's earths earth's crust today is in t the northwest part pait or the Pacific bordering bordering bor bor- dering on the great Deep Dr Smith said This broad belt of folded rocks the tho great P circum Pacific includes the entire archipelago archipelago archipelago archi archi- pelago of Japan of the Philippines and New Guinea in the western Pacific Pacific Pacific Pa Pa- and this same belt runs right around the Pacific ocean This is the first groat great major feature feature fea- fea ture tuie of ot the e Pacific Although geo- geo synclinal it comprises land masses new nev above water but previouslY there was a great trough In which many thousands of feet of sediments sediments sediments sedi sedi- ments were laid downA down I A GREAT TROUGH Later these sediments were raised and crumpled Into their present East of f this re region region region re- re gion is the tho great trough known as the Deep To the south of this Just east of ot the Philippines is a still greater deep which Is the continuation of the one east of ot Ja Japan Japan Japan Ja- Ja pan and this is known as the Planet or Philippines Deep This is the deepest known place in any ocean being toeing slightly over ver six miles in m These two great deeps with the one of intermediate depth east of Formosa I form a long Jong narrow narrow narrow nar nar- row trough on the east side ot ur the Asiatic continental platform Still farther to tho the east of this trough in iii is a submerged mountain range fact several but one in particular find and which apparently Is rising some day will ill form a new festoon Japan and of islands tho the Philippines M investigations Investigations According to th the latest belie believed in the tho Pacific it Is due to accommodations that great thrusts s in the outer shell of the earth are taking place in the direction di direction di- di of the tho Asiatic continent A WESTWARD DRIFT In In fact one no investigator of note sots maintained there is a recently has constant westward maintained drift of landmasses land landmasses d dit float loat as asit asit masses which he claims it were like icebergs in a viscous substratum of molten e magma a Whatever the facts may be It is sure auto that disturbances have haye been taking place along alonS' the margins or of orthe the Pacific for thousands of 5 years ears and even through geologic periods and these disturbances will continue continue continue con con- at intervals for eons to come The boarders of f the continents continent are generally the newest portions and it is only in the centers of the continents in the tl older formations comparative comparativo that we may look for stability Most of or the great volcanoes volcanoes vol vol- vol- vol canoes are also in this marginal than earthquakes earthquakes earthquakes earth earth- zone In fact rather quakes having been caused by volcanoes vol volcanoes vol- vol canoes both tooth earthquakes and voldis volcanoes vol volcanoes vol- vol disturbances disturbances dis dis- dis- dis canoes are due to deep se seated deep in the earths earth's outer shell and while we may have volcanic eruptions without great earthquakes earthquakes earth earth- earthquakes quakes we may have without any reference to volcanoes either one ono is a manifestation of ot instability |