Regional anomalies of P-wave amplitudes and tectonics of focal regions

Details Regional anomalies of P-wave amplitudes and tectonics of focal regions Regional anomalies of P-wave amplitudes and tectonics of focal regions

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...19..228p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 19, Issue 3, p. 228-238.

Physics

2

Scientific paper

A distinct regional dependence of amplitude observations at closely-situated pairs of Central European seismic stations (about 1° apart) was observed for the short-period P waves at teleseismic distances. For the investigated regions, namely Japan, the Kuriles, Kamchatka, the Aleutians, and Alaska, the magnitude corrections change by 0.3 magnitude units. These changes are related to the change of the strike and dip of the sinking lithospheric plates. A relative decrease of the amplitudes, generally observed for different pairs of stations, corresponds to a decrease of the angle between a seismic ray and a slab.

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