This seems to lie within the Rio Grande Rift, a plate tectonic feature dividing the mountainous West from the more stable parts of eastern America. Clusters of

This seems to lie within the Rio Grande Rift, a plate tectonic feature dividing the mountainous West from the more stable parts of eastern America. Clusters of earthquakes can precede a larger earthquake or indicate the motion of lava at depth perhaps leading to an eruption. In geological time the Rio Grande Rift has experienced both.