# What tectonic structures exist on the Eurasian - North American plate boundary in eastern Siberia?

It is reasonably well known that the North American tectonic plate includes a portion of eastern Siberia. What is often typical in plate tectonic maps is that the actual plate boundary is often drawn with a degree of uncertainty, for example, the map below from the NASA Earth Observatory website is very scant on details of this particular boundary, at times, the plat boundary is referred to as 'diffuse'.

What tectonic structures exist on the Eurasian - North American plate boundary in eastern Siberia?

They describe the uniqueness of the plate boundary as the Euler pole of rotation occurring on or near the plate boundary itself (labelled as NA-EU Pole in the diagram above), which results in the general extensional in the north and compressional complexes in the south.