Introduction

Two recent fatal Mexican earthquake  at Puebla  with Oxaca  (2018-02-16, Mw  7.2, 14 fatalities) highlight the unusually complex seismic hazard in Mexico. The Puebla quake 2017-09-23, Mw 7.1, 370 fatalities and occurred within a flat slab  at depths of around 50 kms, and was