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Seismological Problem, Seismic Waves and the Seismic Mainshock

Author

Listed:
  • Bogdan Felix Apostol

    (Department of Engineering Seismology, Institute for Earth’s Physics, Magurele-Bucharest MG-6, P.O. Box MG-35, 077125 Magurele, Romania)

Abstract

The elastic wave equation with seismic tensorial force is solved in a homogeneous and isotropic medium (the Earth). Spherical-shell waves are obtained, which are associated to the primary P and S seismic waves. It is shown that these waves produce secondary waves with sources on the plane surface of a half-space, which have the form of abrupt walls with a long tail, propagating in the interior and on the surface of the half-space. These secondary waves are associated to the seismic mainshock. The results, previously reported, are re-derived using Fourier transformations and specific regularization procedures. The relevance of this seismic motion for the ground motion, the seismographs’ recordings and the effect of the inhomogeneities in the medium are discussed.

Suggested Citation

  • Bogdan Felix Apostol, 2023. "Seismological Problem, Seismic Waves and the Seismic Mainshock," Mathematics, MDPI, vol. 11(17), pages 1-12, September.
    • Handle: RePEc:gam:jmathe:v:11:y:2023:i:17:p:3777-:d:1231768
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