Igor,

Your blog is very interesting to read. Maybe, you would find the following paper interesting

http://www.agu.org/pubs/crossref/2011/2011GL049223.shtmlGEOPHYSICAL RESEARCH LETTERS, VOL. 38, L20310, 5 PP., 2011, doi:10.1029/2011GL049223

Compressive sensing of the Tohoku-Oki Mw 9.0 earthquake: Frequency-dependent rupture modes, Huajian Yao, Peter Gerstoft, Peter M. Shearer, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA

Christoph Mecklenbräuker

Institute of Telecommunications, Vienna University of Technology, Vienna, Austria

Peter

Thanks Peter, you bet I find it interesting. Here is the paper: Compressive sensing of the Tohoku-Oki Mw 9.0 earthquake: Frequency-dependent rupture modes by Huajian Yao, Peter Gerstoft, Peter M. Shearer, and Christoph Mecklenbräuker. The abstract reads:

Compressive sensing (CS) is a technique for finding sparse signal representations to underdetermined linear measurement equations . We use CS to locate seismic sources during the rupture of the 2011 Tohoku-Oki Mw9.0 earthquake in Japan from teleseismic P waves recorded by an array of stations in the United States. The seismic sources are located by minimizing the l_2 norm of the difference between the observed and modeled waveforms penalized by the l_1 norm of the seismic source vector. The resulting minimization problem is convex and can be solved efficiently. Our results show clear frequency-dependent rupture modes with high frequency energy radiation dominant in the down dip region and low frequency radiation in the up dip region , which may because d by differences in rupture behavior ( more intermittent or continuous) at the slab interface due to heterogeneous frictional properties

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