Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/4122
Authors: | de Lorenzo, S.* Filippucci, M.* Boschi, E.* |
Title: | An EGF technique to infer the rupture velocity history of a small magnitude earthquake | Journal: | Journal of geophysical research | Series/Report no.: | b10 / 113 (2008) | Publisher: | AGU | Issue Date: | 2008 | DOI: | 10.1029/2007JB005496 | Keywords: | EGF technique | Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics |
Abstract: | An empirical Green’s function (EGF) technique has been developed to detect the rupture velocity history of a small earthquake. The assumed source model is a circular crack that is characterized by a single and unipolar moment rate function (MRF). The deconvolution is treated as an inverse problem in the time domain, which involves an assumed form of the moment rate function (MRF). The source parameters of the MRF are determined by adopting a global nonlinear inversion scheme. A thorough synthetic study on both synthetic and real seismograms allowed us to evaluate the degree of reliability of the retrieved model parameters. The technique was applied to four small events that occurred in the Umbria-Marche region (Italy) in 1997. To test the hypothesis of a single rupture process, the inversion results were compared with those arising from another EGF technique, which assumes a multiple rupture process. For each event, the best fit model was selected using the corrected Akaike Information Criterion. For all the considered events the most interesting result is that the selected best fit model favors the hypothesis of a single faulting process with a clear variability of the rupture velocity during the process. For the studied events, the maximum rupture speed can even approach the P-wave velocity at the source, as theoretically foreseen in studies of the physics of the rupture and recently observed for high-magnitude earthquakes. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
articolo.pdf | 3.25 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
50
7
checked on Feb 10, 2021
Page view(s) 50
173
checked on Apr 24, 2024
Download(s)
26
checked on Apr 24, 2024