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DzIewonski, A. M.
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DzIewonski, A. M.
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- PublicationRestrictedOn the relevance of Born theory in global seismic tomography(2006)
; ; ; ; ;Boschi, L.; Eidgenossische Technische Hochschule, Zurich, Switzerland. ;Becker, T. W.; Department of Earth Sciences, University of Southern California, Los Angeles, California, USA. ;Soldati, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Dziewonski, A. M.; Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts, USA.; ; ; Does the application of seismic Born theory, as opposed to simpler ray theory, lead to an improvement in tomographic images of the Earth? In recent publications, Montelli et al. (2004a, 2004b) and van der Hilst and de Hoop (2005) among others have expressed opposite opinions. We propose a quantitative approach to the comparison of tomographic images, which we apply to the case of surface-wave phase velocity maps derived with Born vs. ray theory.451 34 - PublicationOpen AccessThe FDSN: history and objectives(1994-09)
; ;DzIewonski, A. M.; Department of Earth and Planetary Sciences, Harvard University, U.S.A.The origins of the Federation of Digital Seismograph Networks (FDSN) can be traced to the summer of 1984. At that time, GEOSCOPE - the French global network of broadband instruments - was already well under way, and in the United States, the Incorporated Research Institutions for Seismology (IRIS) had just published its Science Plan for Global Seismographic Network (GSN). There was clearly an opportunity and the need to involve scientists from other countries in planning for the future of global seismology. An ad hoc meeting of some ten West European seismologists had been arranged in August during the annual meeting of the European Geophysical Society in Louvain. This may be considered to signify the beginning of widescale international cooperation, even though this particular group eventually became the nucleus of ORFEUS (Observatories and Research Facilities for EUropean Seismology). Rather than taking an active role in deployment of new stations, it chose to focus on the issue of providing the service for data collection and exchange, with an important mission of developing the requisite software.120 245