the center of Tangshan.

The second main shock, with a magnitude 7.0 , or 7.4 , struck that afternoon at 18:45:36 near Luanxian, about 70 km 0 to the east-northeast ("B" on the intensity map in the next section), just south of the northeastern end of the Tangshan fault. This occurred in a zone of north-northwest striking conjugate faults that cut across the north end of the Tangshan fault. The left-lateral motion here, along with the right-lateral motion on the Tangshan fault, suggests that as the