Show ILL il WILL QUAI E CITY sais DR J. J E L TAlMA E I WASA W MOUNT tUNS RIS IS Aro Are tho the Wasatch mountains which scientists say arc aio rising likely to cause causo an earthquake at or near Salt St Lake Oft City Tho The question is touched upon by Dr J. J E E. formerly of the University Uni of Utah in fn an nn article on I in Utah in the current cur I rent number of Science a a. periodical published at Hudson on N N. Y Dr Talmage says I It ma may bo ho of interest t to man many to know that seismographic apparatus has recently been n installed at the Un University University cr crI I sity o of Utah Tho The university campus covers part of a n shore terrace built b bythe by bythe the Pleistocene water body known as Lake Bonneville on the tho easterly outskirts outskirts out out- skirts of the region now occupied by Salt Lake City it v n and ami nol Jin lying practically at the tho base of the tile Wasatch rans range The Wasatch mountains are of immature immature immature im im- im- im mature nee age an and consequently are aro now rising Raw scarps at tho foot of a aspur aspur spur pur just northeast from the cit city and similar scarps at the base of the main ran range a short distance to the southeast tell of comparatively recent slips up-slips of these sections of tho mountain mass At the tho Wasatch base baH directly east from the city along the line of the benchland benchland bench- bench land junction with tho the mountain mass there is little evidence of fault move move- I ment at all alJ comparable as to with nth tbd fresh scarps northerly and southerly from the locality described Is Earthquake Coming Th This fact and others of related si significance sig sig- have e inspired the prediction that the next or at least a relatively Cl carl early Ir organic anic uplift in this section orthe of or the Wasatch terrace will v result in n a break to tho the east cast from Salt Lake City Wi with v-ith t h a accompaniments pa ni m e n t s 0 of f destructive en earthquakes r I hi quakes es The foundation of this prophecy of assured q calamity has beon questioned by the writer It is a fact that slight earth tremors occur n at t frequent intervals in the Salt Lake valley These tremors ori originate nate differently mainly as follows 1 In Ino Inorganic Inorganic o organic anic slips incident to the tho rise rise or of ot the Wasatch mass maes or more in incident in incident to the upward slip of some particular par section of the tho ran range e since the mountain mass S does not move mo as a whole 2 in the slips inci incident ent to the tho readjustment of the tho crust crust- blocks composing the basin bain ranges to the west These conditions of movement mo in this vicinity warrant the statement that seismographic records hero obtained promise results of both interest and value Tho The writer is pleased to report the installation of a n pair of seismographic pendulums in Utah The Tho apparatus as asa asa a n whole may be desi designated as RI tho the Bosch Oman seismograph r It was im In imported ported from Bosch Strassburg The University Apparatus Before Defore deciding on the tho purchase of this typo trpo of apparatus the writer inquired in b by correspondence and personal visits sits as LS to instruments for or recording earth carth movements now in operation in inthis inthis inthis this countr country The results showed but few fe installations and t according to tho the reports a considerable number of these were of doubtful efficiency The Bosch seismograph includes es esa a weight of kilograms suspended b by bya a flexible wire and supported in part by bya a cone and socket attachment extend extend- lug ing from an 10 iron iron column four and a half feet hi high h said aid column being firmly anchored to a massive pillar rising from fran a deep foundation and isolated isolate from floor and other surface contact Attached to the weight is a 3 skeleton cono cone of aluminum rods which with frictionless attachments operate a fino fine recording pen pon or point This tracing point rests on tho surface of a R paper paper- covered revolving re drum Tho The paper is glazed on ono one side and when placed in position on the drum is slightly lightly smoked A reliable contact clock is 19 s electrically cally connected with tho the mechanism nazi and a metallic point projecting pro from the tho armature of f an electromagnet electro magnet makes its imprint upon tho the smoked paper at intervals of minutes or seconds The record durin during a period free from earth tremors is a series of uninterrupted lines with dots indicating ing lag timo intervals disturbances are arc shown by cro cross s tracings of ara and short duration w when hen caused by superficial jarring jarrin of tb the thc instrument but bilt smaller as to amplitude and otherwise otherwise otherwise other other- wise distinctively different if jf caused bj by an earth tremor reaching the pillar from below The Equipment Described The Tho equipment of the tho University of Utah comprises two instruments as de tie- described scribed these arc set respectively on the south north and west east lines One clock makes a synchronous record on each of the two drums I The sensitiveness of the apparatus is 13 surprising A blast from tho the human buman lungs in ing upon tho the side of ot the tho supporting pillar is definitely recorded A heavy heavy hea hammer blow blo on the end of tho pillar if delivered on the tho line lino of tho luau main Ii axis axis nort axis south north south h-south o or r west east according to the pillar that is struck struck- makes no tracing beyond that due duo to a slight upward jolt of the recording pen and tho the return of the point perhaps a little out its normal position Each instrument is mounted on a pillar pil pu lar mr or pier of concrete extending about fifteen feet below the floor The entire entire en en- tire apparatus is within a tj tight ht case with glass la 8 sides Ride On Jul July 2 3 a powder explosion occurred occurred oc 00 oc- oc about three miles from the university uni uni- grounds The Tho explosive was fired while Lito packed in frei freight ht cars awaiting awaiting await await- in ing removal tp to the ma magazine buildings near by bv According to report ke kegs s of blasting powder and a ton of giant powder exploded Tho cars ears were were blown to bits rails wore ere broken and the pieces were hurled to great distances dis cUs houses in the vicinity were wrecked and the tIle force of the explosion explosion sion was felt throughout hont tho the city The Thc seismograph recorded tho the movement asa as ns asa a cross cros tracing distinct but susceptible of If measurement only with the aid of a lens |