pure and applied geophysics

, Volume 140, Issue 4, pp 641–653 | Cite as

Procedure of reduction of travel-time curves ofP andS waves at the focal surface

  • A. Bottari
  • B. Federico
  • M. Pietrafesa
  • A. Teramo


A method for the calculation of seismic waves velocities at focal depth is here proposed. A stratified earth model with spherical symmetry and the analytical relationship between the epicentral distance and the travel times of seismic waves are used.

This method, applied to the southern Tyrrhenian region and to the Japanese islands, allows to reduce the observed travel times to the focal depth independently of a particular velocity model.

Key words

Seismic waves travel time hypocentral surface southern Tyrrhenian Japanese islands 


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Copyright information

© Birkhäuser Verlag 1993

Authors and Affiliations

  • A. Bottari
    • 1
  • B. Federico
    • 1
  • M. Pietrafesa
    • 1
  • A. Teramo
    • 1
  1. 1.Istituto Geofisico e Geodetico-Università di MessinaItaly

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