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Three‐dimensional passive seismic waveform imaging around the SAFOD site, California, using the generalized Radon transform
Author(s) -
Zhang Haijiang,
Wang Ping,
van der Hilst Robert D.,
Toksoz M. Nafi,
Thurber Clifford,
Zhu Lupei
Publication year - 2009
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 - 10.1029/2009gl040372
Subject(s) - geology , seismology , geophysical imaging , radon , reflection (computer programming) , active fault , fault (geology) , refraction , mineralogy , physics , quantum mechanics , computer science , optics , programming language
We apply a three‐dimensional (3D) generalized Radon transform (GRT) to scattered P‐waves from 575 local earthquakes recorded at 68 temporary network stations for passive‐source imaging of (near‐vertical) structures close to the San Andreas Fault Observatory at Depth (SAFOD) site. The GRT image profiles through or close by the SAFOD site reveal near‐vertical reflectors close to the fault zone as well as in the granite to the southwest and the Franciscan mélange to the northeast of the main fault. Although slightly lower in resolution, these structures are generally similar to features in 2D images produced with steep‐dip prestack seismic migration of data from active source seismic reflection and refraction surveys. Our GRT images, however, also reveal several vertical reflectors to the northeast of the SAF that do not appear in the migration images but which are consistent with local geology. These results suggest that in a seismically active area, inverse scattering of earthquake data (for instance with the GRT) can be a viable and, in 3D, economic alternative to an active source survey.