1. School of Earth Sciences; Ohio State University; 275 Mendenhall Laboratory, 125 South Oval Mall,; Columbus; Ohio; 43210; USA
2. Center for Earthquake Research and Information; University of Memphis; 3876 Central Avenue, Ste. 1, Memphis,; Tennessee; 38152; USA
3. Institute for Geophysics; University of Texas at Austin; J. J. Pickle Research Campus, Building 196, 10100 Burnet Road (R2200),; Austin; Texas; 78758-4445; USA
4. Deutsches GeoForschungsZentrum; Telegrafenberg, A20 323,; D-14473; Potsdam; Germany
5. Institute for Marine and Atmospheric Research; Utrecht University; Princetonplein 5, 3584 CC Utrecht,; NL-3508; TA Utrecht; Netherlands