Some vents form alignments, and the positions of (not all) individual volcanoes appear to be controlled by normal faults, although isolated volcanoes or clusters also occur and the ascent of magma at many vents was influenced by the general tectonic regime rather than by specific faults. The faults have also influenced the older volcanism and that in turn the Lunar Crater volcanic field. Volcanic activity has buried many of the faults in the area and there is little evidence of ongoing faulting and deformation.