Future of the project

The derived 3D S-velocity model will be converted to a 3D P-velocity model, using both published data on elastic properties (and their partial derivatives with temperature and pressure) of mantle rocks and empirical information provided by measured arrival times of teleseismic P and Pms waves. The corresponding P-wave model will provide an improved ability to locate seismic events.

The prediction and calibration of regional traveltimes and waveforms depend strongly on the methodology used to compute synthetic traveltimes and waveforms from a 3D velocity model. Our goal is to test the obtained S- and P-wave models' ability to predict regional P and S traveltimes, deflect wave paths and deform waveforms using different approximations (e.g. path average vs. exact numerical approaches). We will assess the effects of 3D heterogeneities first on the studied seismograms (traveltimes and waveforms) and subsequently on the 3D models derived from these data.

Figure 13.42: a) Map of the Middle East showing four earthquakes and paths for which waveform fits are shown. The events are indicated by their moment tensors. Stations are shown as blue triangles - b) 1D S-velocity models for the four paths shown in a). The used starting model, MC35, is shown in black - c) Fits for vertical component S- and Rayleigh waveforms for the four paths shown in a). In each panel, we show the observed waveform (black), the synthetic waveform computed using the starting (red dashed) and with the final model (green).
\begin{figure}\begin{center}
\epsfig{file=federica05_2_1.eps, width=8cm}\vspace{1cm}
\end{center}\end{figure}

Berkeley Seismological Laboratory
215 McCone Hall, UC Berkeley, Berkeley, CA 94720-4760
Questions or comments? Send e-mail: www@seismo.berkeley.edu
© 2005, The Regents of the University of California