Two faults of the East Anatolian Fault (EAF) system ruptured today. First, a Mw7.8 #earthquake on EAF main strand probably breaking several segments. Second a Mw7.5 to 7.7 on the Sürgü-Çartak Fault (EAF N strand). Both ruptures are outlined by their aftershocks (circles on map), and both are left-lateral.
There are many aftershocks following the two big earthquakes, but the second rupture is rather a triggered earthquake on an adjacent fault belonging to the EAF system.
This reminds us to be wary of possible strong aftershocks or triggered ruptures in the following days-weeks after a big earthquake.
@RobinLacassin The usgs has it as normal, and I found only one big one. But lots of places have it at two.
@RobinLacassin I guess we would call that a wrench fault, since it is not pure strike-slip or extension. The tectonics looks like that, as well. We need the strong ground motion.
@hasmis Here links to the two big events as determined by USGS.
• https://earthquake.usgs.gov/earthquakes/eventpage/us6000jllz/executive
• https://earthquake.usgs.gov/earthquakes/eventpage/us6000jlqa/executive
If you look to the moment tensor solutions (images below), they are both strike-slip with rupture likely on the NE-SW plane for the first one, and on the E-W plane for the second.