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Body-to-surface-wave scattered energy in teleseismic coda observed at the NORESS seismic array

DEPARTMENT OF GEOLOGICAL SCIENCES THE UNIVERSITY OF SOUTH CAROLINA, COLUMBIA, SOUTH CAROLINA 29208
DEPARTMENT OF GEOSCIENCES PENNSYLVANIA STATE UNIVERSITY, UNIVERSITY PARK, PENNSYLVANIA 16802

Abstract

Teleseismic data recorded at the NORESS seismic array are examined to determine the degree and scale of lithospheric heterogeneities beneath the array and to locate local scattering sources. The data are examined using relative coda intensity envelopes, frequency-wavenumber spectra, and particle motion polarizations. The coda intensity envelopes do not exhibit any clear ka trends; the 0.5-Hz pass-band data does, however, contain higher energy levels and a high energy packet 15 sec after the first arrival. Frequency-wavenumber analysis shows shows that most of the teleseismic coda is vertically propagating. The window centered near 15 sec, however, contains energy traveling to the northeast at a low apparent velocity. Particle motions in this window follow a retrograde elliptical pattern characteristic of Rayleigh surface waves. The scattering source presumed to be responsible for the observed body-to-surface-wave scattered energy is Lake Mjosa located approximately 30 km west-southwest of the array.

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