...We must conclude, therefore, that earthquake vibrations originate in the surface of fractures; that the surface from which they start has at first a very small area, i) La Science Seismologique, pp. 83, 84. which may quickly become very large, but at a rate not greater...

...extend only a few miles from the fracture. 4. The earthquake vibrations originate in the surface of the fracture; the surface from which they start has at...first a very • small area, which may quickly become large, but at a rate not greater than the velocity of compressional elastic waves in the rock. Earthquakes...

...surface from which they start has at first a very small area, i) La Science Söismologique, pp. 83, 84. which may quickly become very large, but at a rate not greater than the velocity of com pressional elastic waves in the rock. An old problem of seismology, and one which, thongh its meaning...

...earthquake <fre the sudden elastic rebounds of the sides of the fracture towards positions of no elastic strain; and these movements extend to distances of...than the velocity of compressional elastic waves in th< rock. 5. The energy liberated at the time of an earthquake was, immediately before the rupture,...

...distances only a few miles from the fracture. 4. The earthquake vibrations originate in the surface of tire fracture; the surface from which they start has at...area, which may quickly become very large, but at Tembl. y Terr. 6 . Ч a rate not greater than the velocity of compressionnal elastic waves in the rock....

...of no elastic strain; and these movements extend to distances of only a few miles from the fracture. The earthquake vibrations originate in the surface...rate not greater than the velocity of compressional clastic waves in the rock. Effect of Shock. — The student must carefully bear in mind the difference...