A neat link from a scientific source:
www.data.scec.org...
Excerpt:
The Brawley fault zone is a complex set of faults that is intricately connected to the Imperial fault zone. That connection exists, apparently, due to transfer of right-lateral slip from the Imperial fault zone to the Brawley fault zone. The area is made even more unusual by virtue of its high heat flow -- essentially, the subsurface is hotter (and thus, less brittle) due to the local thinness of the crust. Due to this and the rapid rate of slip, faults in the area are probably prone to aseismic creep. Because of the complexity of the fault system at work, it is also prone to earthquake swarms, like that which coincided with the ground movement in 1975, which broke the surface trace for a distance of 10.4 km with a maximum displacement (vertical) of 20 cm.
Cal Poly Pomona Geophysics has been posting about this swarm tonight, follow for updates if there's any more to tell:
twitter.com...
