The 1992 Cairo Earthquake, also known as the 1992 Dahshur earthquake, occurred at 15:09 local time (13:09 UTC) on 12 October, with an

epicenter The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Surface damage Before the instrumental pe ...

in the Western Desert near

Dahshur DahshurAlso transliterated ''Dahshour'' (in English often called ''Dashur'' ar, دهشور ' , ''Dahchur'') is a royal necropolis located in the desert on the west bank of the Nile approximately south of Cairo. It is known chiefly for several p ...

Giza Giza (; sometimes spelled ''Gizah'' arz, الجيزة ' ) is the second-largest city in Egypt after Cairo and fourth-largest city in Africa after Kinshasa, Lagos and Cairo. It is the capital of Giza Governorate with a total population of 9.2 ...

, south of

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia via a land bridge formed by the Sinai Peninsula. It is bordered by the Mediter ...

's capital and most populous city,

Cairo Cairo ( ; ar, القاهرة, al-Qāhirah, ) is the capital of Egypt and its largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metro ...

. The

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

had a

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

of either 5.8 or 5.9, but was unusually destructive for its size, causing 561 deaths and injuring 12,392 people. It also made over 30,000 families homeless in tens of cities and villages across 16 governorates, in

Greater Cairo The Greater Cairo Region (GCR; ar, القاهرة الكبرى, Al-Qāhira al-Kubrā) is th an economic region with no administrative body comprising the three governorates of Cairo, Giza and Qalyubia. Within it lies the largest metopolitan are ...

, the

Delta Delta commonly refers to: * Delta (letter) (Δ or δ), a letter of the Greek alphabet * River delta, at a river mouth * D ( NATO phonetic alphabet: "Delta") * Delta Air Lines, US * Delta variant of SARS-CoV-2 that causes COVID-19 Delta may also ...

, and northern

Upper Egypt Upper Egypt ( ar, صعيد مصر ', shortened to , , locally: ; ) is the southern portion of Egypt and is composed of the lands on both sides of the Nile that extend upriver from Lower Egypt in the north to Nubia in the south. In ancient ...

. It was the most damaging seismic event to affect Egypt since 1847.

Geology

Cairo is sited within a diffuse zone of

faulting In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

that transfers extension from the

Gulf of Suez Rift The Gulf of Suez Rift is a continental rift zone that was active between the Late Oligocene ( 28 Ma) and the end of the Miocene (c. 5 Ma). It represented a continuation of the Red Sea Rift until break-up occurred in the middle Miocene, with most ...

to the Manzala rift beneath the

Nile delta The Nile Delta ( ar, دلتا النيل, or simply , is the delta formed in Lower Egypt where the Nile River spreads out and drains into the Mediterranean Sea. It is one of the world's largest river deltas—from Alexandria in the west to Po ...

Damage

The areas of greatest damage were in

Old Cairo Old Cairo (Arabic: مصر القديمة , Miṣr al-Qadīma, Egyptian pronunciation: Maṣr El-ʾAdīma) is a historic area in Cairo, Egypt, which includes the site of a Roman-era fortress and of Islamic-era settlements pre-dating the founding of ...

Bulaq Boulaq ( ar, بولاق, Būlāq from "guard, customs post"), is a district of Cairo, in Egypt. It neighbours Downtown Cairo, Azbakeya, and the River Nile. History The westward shift of the Nile, especially between 1050 and 1350, made land ava ...

and southwards along the Nile as far as Girza, on the west bank. 350 buildings were completely destroyed and 9,000 other severely damaged. 216 mosques and 350 schools were badly damaged and about 50,000 people made homeless. Most of the severe damage was confined to older masonry structures and particularly those built of

adobe Adobe ( ; ) is a building material made from earth and organic materials. is Spanish for ''mudbrick''. In some English-speaking regions of Spanish heritage, such as the Southwestern United States, the term is used to refer to any kind of e ...

Liquefaction In materials science, liquefaction is a process that generates a liquid from a solid or a gas or that generates a non-liquid phase which behaves in accordance with fluid dynamics. It occurs both naturally and artificially. As an example of the ...

was reported from areas near the epicenter. It caused the collapse of a multi-storey apartment building in Heliopolis, killing 79 people. Fortunately, many of the inhabitants were outside of the building at the time of the event. It was later revealed that many additional stories were added to the building illegally and the ground floor/basement had been opened up to accommodate community amenities, including a laundry. The high number of deaths and injuries (561 and 12,392 respectively) was partly due to the amount of panic caused by the earthquake in Cairo itself. Damage was reported to have affected 212 out of a total of 560 historic monuments in the Cairo area. A large block fell from the

Great Pyramid of Giza The Great Pyramid of Giza is the biggest Egyptian pyramid and the tomb of Fourth Dynasty pharaoh Khufu. Built in the early 26th century BC during a period of around 27 years, the pyramid is the oldest of the Seven Wonders of the Ancient World, ...

Earthquake characteristics

The earthquake was felt throughout most of northern Egypt, in

Alexandria Alexandria ( or ; ar, ٱلْإِسْكَنْدَرِيَّةُ ; grc-gre, Αλεξάνδρεια, Alexándria) is the second largest city in Egypt, and the largest city on the Mediterranean coast. Founded in by Alexander the Great, Alexandria ...

Port Said Port Said ( ar, بورسعيد, Būrsaʿīd, ; grc, Πηλούσιον, Pēlousion) is a city that lies in northeast Egypt extending about along the coast of the Mediterranean Sea, north of the Suez Canal. With an approximate population of 6 ...

and as far south as

Asyut AsyutAlso spelled ''Assiout'' or ''Assiut'' ( ar, أسيوط ' , from ' ) is the capital of the modern Asyut Governorate in Egypt. It was built close to the ancient city of the same name, which is situated nearby. The modern city is located at , ...

, and in southern

Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...

. The calculated

focal mechanism The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is ...

suggests that this event originated on a WNW-ESE or W-E trending normal fault with a small

strike-slip In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

component. The

aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousand ...

s extended about to the south-east of the main shock epicentre, indicating unidirectional rupture propagation. The estimated fault rupture length was also . The earthquake consisted of two sub-events, the second located about south-east of the first.

Response

The government was criticized for not doing much to respond. On the other hand, Islamic fundamentalist groups such as the

Muslim Brotherhood The Society of the Muslim Brothers ( ar, جماعة الإخوان المسلمين'' ''), better known as the Muslim Brotherhood ( ', is a transnational Sunni Islamist organization founded in Egypt by Islamic scholar and schoolteacher Hassan ...

stepped in to provide aid.

References

External links