A laboratory study of teleseismic Pn waves |
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Authors: | Shi-Yu Gao and Shan Ding |
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Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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Abstract: | In this paper, the influences of mechanical properties of low velocity layers and thickness of high velocity layers in the
lower lithosphere on the horizontal propagaties of seismic waves are discussed by means of altrasonic seismic model experiments;
It is shown that the structure of the lower lithosphere consisting of soft low velocity layers and thin high velocity layers
is favourable for the horizontal propagation of seismic energy, therefore, it is a very possible structure pattern of the
lower lithosphere responsible for Pn and later high velocity arrivals observed in long range distances; Such pattern is also
consistent with studies of rheological stratification of the lower lithosphere beneath mid-ocean-ridges and continental rifts.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 97–102, 1993.
The project is supported by the Chinese joint Seismological Science Foundation. |
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Keywords: | lower lithosphere Pn and its later arrivals seismic model experiments thickness of thin high velocity layers soft low velocity layers |
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