Figure 13.45: Data coverage - Paths of teleseismic events with $M_{w} \ge 6$ recorded at North American stations (indicated by white triangles), for which high quality fundamental mode Rayleigh wave packets have been selected.
\epsfig{file=federica05_1_1.eps, width=8cm}\end{center}\end{figure}

In this study, we consider fundamental and overtone surface waveforms selected from 3 component long period seismograms. Surface wave data for paths relevant to the study region has been extracted from the existing compilation used for global tomography in Panning and Romanowicz (2005). This dataset has been further complemented with waveforms from events at teleseismic and far regional distances (15$^{\circ}$$< \Delta <$ 65$^{\circ}$) recorded at broad band seismic stations in North America. The collected dataset includes data for 540 events from 1993 to 1999, with $M_{w}$ between 6.0 and 7.0. The main criteria guiding the event selection has been the achievement of the best possible path (Figure 13.45) and azimuthal coverage for the North American continent.

From each deconvolved and filtered seismogram, individual fundamental and higher mode surface wave packets have been extracted using an automated selection algorithm (Panning and Romanowicz, 2005) and subsequently checked by hand, to ensure a high quality dataset.

Our final dataset consists of more than 18,000 fundamental and 20,000 higher mode high quality surface wave packets. We expect that the achieved fairly homogeneous path and azimuthal coverage for North America will be further improved by taking advantage of the broad band dataset that is being collected under the USArray effort within EarthScope.

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