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Concrete dams as seismic imaging sources
Author(s) -
O'Connell Daniel R. H.
Publication year - 2007
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 - 10.1029/2007gl031219
Subject(s) - seismometer , autocorrelation , seismology , broadband , seismic noise , geology , passive seismic , vibration , acoustics , physics , optics , statistics , mathematics
We obtained noise correlation functions (NCF) in northern Montana from broadband data that include P‐ and S‐wave first arrivals and short‐period surface waves for frequencies extending to nearly 15 Hz at offsets of 5–17 km using ambient resonant vibrations of a concrete gravity‐arch dam as seismic source. A seismograph operated close to the dam acted as a virtual source with a compact autocorrelation function, making it feasible to use short‐duration cross‐correlation time windows to obtain a larger number of NCF stacks with impulsive high‐frequency body wave first‐arrivals from recording durations of a single day to several weeks.