Old and new Clear Lake Volcanic Field monitoring extents

This animated gif shows changes to the monitoring regions of this volcano which were implemented in May 2020. This update better reflects the areas where we would typically expect volcanic unrest, as opposed to the slightly more arbitrary regions that were previously used. The result of these changes is that the number of earthquakes we report each week for these volcanic areas will be slightly different than they were before, but more reflective of unrest specifically related to at each of our volcanoes.