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On the nature of regional seismic phases-I. Phase representations for Pn, Pg, Sn, Lg (1989)

Kennett, B. L. N.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 98 (1989), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: An operator development of the seismic wavefield is used to generate descriptions of the propagation processes contributing to the main regional seismic phases Pn, Pg, Sn, Lg. These operator forms are valid for laterally heterogeneous crust and mantle models and include the major processes of interconversion between wavetypes. These representations of the regional phases are used to examine the theoretical basis for discriminants between earthquakes and underground explosions based on the relative amplitudes of P and S phases. The ratio of Sn to Pn amplitude looks promising as a high frequency discriminant. However, the ratio of Lg to Pn amplitudes is not as useful because of the complex nature of the propagation characteristics of Lg.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb02281.x

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