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Broadband F‐k analysis of array data to identify sources of local scattering
Author(s) -
Gupta I. N.,
Lynnes C. S.,
Wagner R. A.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i002p00183
Subject(s) - seismogram , scattering , broadband , geology , seismology , seismic array , residual , aperture (computer memory) , remote sensing , optics , physics , acoustics , algorithm , computer science
F‐k analyses of short‐period recordings of both U.S. and Soviet underground nuclear explosions at the Eskdalemuir (EKA), Scotland array indicate arrivals from a local source about 15 km due northwest of the array. Use of residual seismograms derived by subtracting the beamed record from each array channel confirmed the presence of the same scatterer. The secondary seismic source appears to be short‐period surface waves due to the scattering of incident P waves at a nearby deep valley known as Moffat Water, in agreement with Key's (1967) results. Similar analyses of the NORESS (Norway) array data from U.S. and Soviet nuclear shots also indicate secondary arrivals suggesting a local near‐surface scatterer about 25–30 km southwest of the array, in the region of Lake Mjosa. Thus, short‐aperture array data can be useful in identifying and locating sources of near‐receiver scattering.