HR: 0800h
AN: S41A-0255    [Abstracts]
TI: Modeling the Dominant Noise Sources in Southern Italy
AU: * Brzak, K
EM: kbrzak@ualberta.ca
AF: Department of Physics, University of Alberta, CEB Building, Edmonton, AB T6G2G7, Canada
AU: Gu, Y J
EM: jgu@phys.ualberta.ca
AF: Department of Physics, University of Alberta, CEB Building, Edmonton, AB T6G2G7, Canada
AU: Dublanko, C
EM: cmd3@phys.ualberta.ca
AF: Department of Physics, University of Alberta, CEB Building, Edmonton, AB T6G2G7, Canada
AU: Steckler, M S
EM: steckler@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
AU: Lerner-Lam, A
EM: lerner@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
AU: Okeler, A
EM: aokeler@phys.ualberta.ca
AF: Department of Physics, University of Alberta, CEB Building, Edmonton, AB T6G2G7, Canada
AB: We present the result of noise correlation and source modeling using recordings from the CATSCAN (Calabrian- Apennine-Tyrrhenian/Subduction-Collision-Accretion Network) broadband deployment in southern Italy. Using more than two months of data, we were able to extract potentially dominant noise sources and validate them using various processing algorithms. Our mid-frequency data (0.06-0.1 Hz) indicate at least two dominant noise sources, likely originating from the Adriatic and Tyrrhenian coasts of Italy. The findings indicate that locating ambient noise source is possible even in complex regions, such as southern Italy, that are surrounded by bodies of water. Further analysis shows that asymmetric correlation stacks could be produced even under the influence of reasonably uniform source distributions. We believe that changes in the position of stations relative to sources may produce notable differences in the symmetry of the correlated data. Results from further numerical modeling of sources for different locations, and for different arrangements (both for location of sources, and number of sources), were compared against the actual data to validate the proposed locations of dominant noise source. While the source modeling results may not be unique, there is still supporting evidence that the two proposed dominant sources, the Gargano promontory and the eastern Tyrrhenian sea, are likely responsible for the observed Rayleigh waves. Further investigations of secondary sources using a larger data set are currently underway.
DE: 7200 SEISMOLOGY
DE: 7255 Surface waves and free oscillations
SC: Seismology [S]
MN: 2007 Fall Meeting