ISMAILLI EARTHQUAKE on October 7, 2012 with MLAzr=5.7, MwGCMT=5.1, I0P=5-6 (Azerbaijan)
The instrumental data on Ismailli earthquake on October 7, 2012 at 11 h42m with ML Азр=5.3 within the southeastern segment of the Greater Caucasus, along the West Caspian fault presented. A large (NΣ=254) series of aftershocks with magnitudes ML Азр>0.1, with a very noticeable (ML Азр=3.3) shock in an hour (at 12h42m) after the main event was accompanied the earthquake. The maximum aftershock with ML Азр=3.5 is registered on November, 12. The magnitude step between it and the main shock is ΔМа=1.8. The field of aftershocks in the form of an irregular ellipse is somewhat elongated in the north-west direction. The Ismayilli focal zone is characterized by deeper foci with h=30-40 km compared to the neighboring Shamakhi zone with h up to 10 km. Macroseismic data are few (5 points), therefore the macroseismic field calculation was used from I=VI to I=IV according to the US program ELER v3.0 based on the data on earthquake coordinates, maximum values of ground velocity and accelera- tion and the position of the fault. The focal mechanism of the Ismailli earthquake was characterized by horizontal tensile stresses and near-vertical compressive stresses, which led to the slip in the source of a normal fault type. The strike of both nodal planes agrees with the strike of the North-Azhinoor fault.