PROPERTIES OF THE GROUND MOTIONS PARAMETERS NEAR THE EARTHQUAKE FOCUS

  • K.S. Kharebov Geophysical Institute of VSC RAS, Russia, 362002, Vladikavkaz, Markov str., 93a
  • A.N. Baskaev Geophysical Institute of VSC RAS, Russia, 362002, Vladikavkaz, Markov str., 93a; Mountain State Agrarian University, Russia, 362040, Vladikavkaz, Kirov str., 37;
  • Sh.S. Khubezhty South Mathematical Institute of VSC RAS, Russia, 362027, Vladikavkaz, Markusa str., 22
Keywords: Strong Motions Data Base, earthquake, epicentral distance, hypocentral distance, Fourier’s spectrum, peak vertical acceleration, peak horizontal acceleration

Abstract

Additions into the Strong Motions Data Base are represented: records 2015 year with the intensity from5, and also the records with epicentral distance not greater than 7 km with any intensity. A study of the ground motions parameters average values dependence on the hypocentral distance in the neighbor zone of earthquake in the intervals: 0-5, 5-10, 10-15, 15-20, 25-30, 30-40, 40-50, 0-50, 50-2000, 0-2000 km is carried out. The estimation of the statistical significance of dependences is carried out. It is shown that the parameters of ground motions have the extreme point with the hypocentral distances about 20 km, which can be considered as the boundary between the near and far zone of earthquake. It is shown that the ratio of peak vertical acceleration to the peak horizontal acceleration (PVA/PHA) correlates with the magnitude of event - the higher the magnitude, the greater the value PVA/PHA under otherwise equal conditions.
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Published
2016-12-26
Issue
Vol 6 No 4 (2016): Geology and Geophysics of the South of Russia, 2016 No 4
Section
Articles