Summary of Crustal Thickness Measurements in Northwestern Iceland

Fig 1: Map of northwestern Iceland showing fissure swarms (line), central volcanos (curcular outlines), glaciers (shaded), and selected crustal thickness measurements (annotated triangles). Letters in paranthesis refer to data sources: (a) Our reinterpretation of Gebrande et al. [1980]; (b) Menke et al.'s [1996] reinterpretation of Gebrande et al. [1980]; (c) Staples et al. [1997]; and (d) B96 results. (PostScript version).

References

1. Bjarnason, I., W. Menke, O. Flovenz and D. Caress, Tomographic image of the spreading center in south Iceland, J. Geophys. Res. 98, 6607-6622, 1993
2. Gebrande, H., H. Miller and P. Einarsson, Seismic structure of Iceland along the RRISP profile, J. Geophys. 47, 239-249, 1980.
3. Menke, W., B. Brandsdottir, P. Einarsson and I. Bjarnason, Reinterpretation of the RRISP-77 Iceland shear wave profiles, Geophys. J. Int. 126, 166-172, 1996.
4. Staples, R., R. White, B. Brandsdottir, W. Menke, P. Maguire and J. McBride, Faroes-Iceland Experiment - 1: The crustal structure of northeastern Iceland, in press in j. Geophys. Res., 1997.

Notes

Gebrande et al. (1980) give a record section for a shot D (their figure 1) showing a weak secondary arrival that we, following Bjarnason et al. (1993), interpret as PmP. It has a reduced arrival time of 4.0s at 100 km range, and 3.1 s at 150 km range (reduced to 7.0 km/s). Assuming a SIST-like crustal velocity model, the crustal thickness is about 35 km.