Show HELP scientific STUDY A miniature earthquakes ere created abed by setting getting ost off 5 wall small charges of dynamite tire are helping scientists study deep lying rock rk structures of the earth says popular mechanics magazine sensitive instruments record the lea earthquakes by studying the effects of these explosions it Is possible to locate accurately underlying der lying str strata ata of rock as deep as feet below the surface the th apparatus also is used to locate earthquake faults to study the velocity loci tN with which earth tremors are propagated to locate oil shale and to measure the depth of alluvial deposits dynamite charges vary tary fro from one to forty pounds the explosive and recording instruments are carried on a special truck outfitted by scientists of the california institute of technology |