Lava Beds National Monument Geologic Resource Evaluation Scoping Summary
Figure 1: NPS Park Sites.
The black boxes show regions containing subduction zones (convergent tectonic plate boundaries) where tall, steep-sided volcanoes tend to form.
The blue region represents areas where continental rifting (divergent tectonic plate boundaries) is occurring and dark basaltic magma wells up to the surface forming small cinder cones and large, shallow shield volcanoes.
Red boxes are hotspot regions where magma wells up to the surface of the Earth producing large volcanoes that vary in appearance. (National Park Service)