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Seismic waves in 3-d:from mantle asymmetries to reliable seismic hazard assessment

earthquake Science 2014年第5期27卷 567-576页

作者： Giuliano F.Panza Fabio Romanelli department of Mathematics and Geosciences University of TriesteVia Weiss 434127 TriesteItaly International Center for Theoretical Physics SAND groupVia Weiss 434127 TriesteItaly International Seismic Safety Organization ISSO IG-CEA

A global cross-section of the earth parallel to the tectonic equator（TE） path,the great circle representing the equator of net lithosphere rotation,shows a difference in shear wave velocities between the western and eastern flanks of the three major oceanic rift *** lowvelocity layer in the upper asthenosphere,at a depth range of 120 to 200 km,is assumed to represent the decoupling between the lithosphere and the underlying *** the TE-perturbed（TE-pert） path,a ubiquitous LVZ,about 1,000-km-wide and 100-km-thick,occurs in the *** existence of the TE-pert is a necessary prerequisite for the existence of a continuous global flow within the ***-shaking scenarios were constructed using a scenario-based method for seismic hazard analysis（NdSHA）,using realistic and duly validated synthetic time series,and generating a data bank of several thousands of seismograms that account for source,propagation,and site ***,with basic selforganized criticality concepts,NdSHA permits the integration of available information provided by the most updated seismological,geological,geophysical,and geotechnical databases for the site of interest,as well as advanced physical modeling techniques,to provide a reliable and robust background for the development of a design basis for cultural heritage and civil *** of seismic hazard obtained using the NdSHA and standard probabilistic approaches are compared for the Italian territory,and a case-study is *** order to enable a reliable estimation of the ground motion response to an earthquake,three-dimensional velocity models have to be considered,resulting in a new,very efficient,analytical procedure for computing the broadband seismic wave-field in a 3-d anelastic earth model.

关键词： 3d earth - lithosphere Mantle Seismichazard Synthetic seismograms

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