sentences:  The city's Early Classic monuments are poorly preserved, meaning that the history of its period of maximum power is poorly understood.The influence of the distant metropolis of Teotihuacan in the Valley of Mexico is evident in Early Classic imagery following Teotihuacan's decisive intervention at Tikal in AD 378.At the end of the Early Classic, seismic activity caused movement of the Yaxha Fault, resulting in damage to buildings in the East Acropolis.