1853 Shiraz earthquake
The Fars region of Iran was struck by a major earthquake on either 22 April or 5 May 1853. The city of Shiraz and the surrounding area were severely affected, with almost all buildings destroyed. At least 9,000 people were killed, with some estimates reaching 13,000. Tectonic setting Iran lies across the complex plate boundary where the Arabian Plate is colliding with the Eurasian Plate. The Fars region lies within the outermost part of the Zagros fold and thrust belt. This Fars Domain is affected by the presence of thick Neoproterozoic salt of the Hormuz Formation, forming part of the so-called simply folded zone. Despite its name, the folding is accompanied by thrusting, with some strike-slip faulting, such as on the right-lateral Kazerun fault system. From the analysis of hypocentral depths and focal mechanisms, the earthquakes are caused by both faulting within the underlying basement and towards the base of the thick sedimentary cover sequence. Almost all earthquakes occur on blind faults, with no surface rupture. Earthquake sequence The sequence began at about dawn on the day before the mainshock, with the first of a series of foreshocks. These continued throughout that day and into the following morning. The mainshock