Annotated Temblor iPhone app screen shot of earthquakes in southern Nevada associated with the two M=5.7 mainshocks. The red shocks within the dashed ellipses appear to be dynamically triggered aftershocks.

Annotated Temblor iPhone app screen shot of earthquakes in southern Nevada associated with the two M=5.7 mainshocks. The red shocks within the dashed ellipses appear to be dynamically triggered aftershocks.

Annotated Temblor iPhone app screen shot of earthquakes in southern Nevada associated with the two M=5.7 mainshocks. The red shocks within the dashed ellipses appear to be dynamically triggered aftershocks.