A swarm of more than 20 moderate- to small-magnitude earthquakes occurred 35 miles south of Calexico, CA, on the evening of 30 June and morning of 1 July 2012. The swarm began with a M4.6 temblor at 8:25 pm Saturday; the largest quake was a M4.7 at 11:36 pm later that evening. Though poorly constrained the depth to focus was approximately 10 km (6 miles). There were no reports of damage from the nearby communities of Guadalupe Victoria and Mexicali both of Baja California, Mexico.
Most of the 20+ events ranged from M1.5 to M3.0. The swarm occurred at the south end of the Sierra Cucupah along the projection of the Laguna section of the Elsinore fault zone that trends NNW from Baja California to California. On 4 April 2010, a M7.2 earthquake occurred very near to the locus of this
IRIS (Incorporated Research Institutions for Seismology) hosts and distributes a new computer display system, Active Earth Monitor. Designed for K-12 schools, museums, visitor centers and libraries, Active Earth Monitor provides an interactive environment for learning earth science topics.
From IRIS’s description, “All Active Earth Monitor content can be interactive using a touch screen, mouse or trackball. The General Seismicity content can also be displayed as rotating non-interactive content using a standard monitor.”
Active Earth Monitor promises to be a powerful tool for visualizing Earth science processes. Anyone with a computer, monitor, good internet connection, and desire to share information can establish their own Active Earth Monitor. Give it a look.