FIGURE 1. Three-dimensional view of the lithosphere–asthenosphere boundary and surface topography.
From the following article:
A sharp lithosphere–asthenosphere boundary imaged beneath eastern North America
Catherine A. Rychert, Karen M. Fischer and Stéphane Rondenay
Nature 436, 542-545 (28 July 2005)
doi: 10.1038/nature03904
Red box in the inset map highlights the location of the study region within North America. Shading on the top surface indicates topography. Yellow arrow points in the direction of absolute plate motion; plate velocity is 2.5 cm yr-1. Red triangles denote station locations. The lower surface represents the location of the base of the lithosphere interpolated from migrated Ps waveform images at the six labelled stations. The larger text corresponds to the stations (HRV, LMN, BINY) where this phase is most clearly observed. This surface ranges from 90 km (orange) to 110 km (pink) depth. Each colour band covers 2 km in depth. Blue circles on the discontinuity surface indicate the conversion points of the Ps phases. Black lines connect piercing points to the station at which the conversion is observed.
