Latest Information from Seismic Observations

摘要: Seismology provides the most direct and accurate data regarding structure of interior of Earth. Classical seismological methods determine the velocities elastic body waves, P S. Modem supply the anelasticity a more determination density, as well refinements in velocity structure. The increasing number standardized calibrated seismometers around world, availability from large explosions, the increasing use computers in analysis are recent developments which have increased potential classical wave method. The development of long-period instruments, including seismometers, gravimeters, tiltmeters strain gauges was key factor involved rise long-period seismology, which includes study surface free oscillations long term deformations supplement from classical seismology