What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event?
This analysis examines the geological and tectonic factors behind the September 8, 2023, magnitude 6.9 earthquake in Morocco. It details the role of the Azores–Gibraltar transform fault, the specific mechanics…
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“What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event?” thisDay, thisday.info/history/2023-al-haouz-earthquake-2023/. Accessed 19 Oct. 2026.
What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event? (n.d.). thisDay. Retrieved October 19, 2026, from https://thisday.info/history/2023-al-haouz-earthquake-2023/
“What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event?” thisDay. Accessed October 19, 2026. https://thisday.info/history/2023-al-haouz-earthquake-2023/.
Seismic Precedents and Context
The 2023 Al Haouz earthquake stands out in regional history due to its magnitude and lethality compared to previous major seismic events in North Africa.
| The plan needed | What happened | Why it mattered |
|---|---|---|
| 1960 Agadir earthquake | 2023 Al Haouz earthquake | The 2023 event is the deadliest in Morocco since the 1960 Agadir disaster, marking a significant recurrence of high-impact seismic activity in the region. |
| 2006 Mozambique earthquake (Mw 7.0) | 2023 Al Haouz earthquake (Mw 6.9) | The 2023 quake is the largest on the African continent since the 2006 Mozambique event, highlighting the rarity of such high-magnitude seismic activity in the region. |
| 1980 El Asnam earthquake (Mw 7.1) | 2023 Al Haouz earthquake (Mw 6.9) | It is the largest earthquake in North Africa since the 1980 El Asnam earthquake in Algeria, underscoring the persistent seismic hazard across the northern African plate boundary. |
Tectonic Origins in the Atlas Region
Morocco sits south of the Azores–Gibraltar transform fault, a major boundary between the African and Eurasian plates. This fault stretches from the Azores to the Strait of Gibraltar, dominated by right-lateral strike-slip movement. In the Gibraltar Arc and Alboran Sea, the boundary becomes transpressional, developing large thrust faults. East of the Strait of Gibraltar, the boundary shifts to a collisional type. Most seismic activity in Morocco relates to this plate boundary, with the greatest hazard located in the north near the boundary. The complex interplay of these tectonic forces creates a persistent risk of significant seismic events across the northern part of the country, where the crustal stress is most concentrated.
The Atlas Mountains form an intracontinental belt extending 2,000 km from Morocco to Tunisia, created by Cenozoic collision. The High Atlas subrange formed when an ancient Triassic rift was reactivated, compressing the rift due to northern collision. The range’s high topography suggests mantle upwelling may have influenced its formation. Crust beneath the Atlas is 32–40 km thick, thinner than the 50 km typically required to support elevations over 4,000 m. This thin crust, raised by mantle upwelling, contributes to the region's unique seismic profile. The geological configuration makes the area particularly susceptible to shallow, high-intensity earthquakes that can cause widespread damage despite the region's overall tectonic stability.
Mechanics of the 2023 Seismic Event
On September 8, 2023, at 23:11 DST, a magnitude 6.9 earthquake struck Al Haouz Province. The quake resulted from shallow oblique-thrust faulting beneath the mountain range. This mechanism generated the force recorded as the strongest instrumentally measured earthquake in Morocco's history. The maximum Mercalli intensity reached IX (Violent), indicating severe shaking and widespread damage in the affected areas. The shallow depth of the rupture meant that the energy released was transmitted efficiently to the surface, maximizing the destructive potential in the immediate vicinity of the fault trace.
The seismic waves propagated beyond the immediate epicenter, reaching neighboring countries. The tremor was felt in Spain, Portugal, and Algeria, demonstrating the event's broad reach. This wide propagation highlighted the magnitude of the seismic release. The shallow depth of the faulting contributed to the intensity of the shaking felt at the surface, particularly in the Atlas Mountains region. The event's characteristics distinguish it from deeper seismic events, which typically cause less surface damage despite similar magnitudes. The broad geographic reach of the tremors underscored the significant energy release associated with this particular tectonic event.
Immediate Impact and Humanitarian Response
The earthquake caused at least 2,960 deaths, with most fatalities occurring outside Marrakesh. Damage was widespread, and historic landmarks in the city were destroyed. Over 2.8 million people from Marrakesh and surrounding Atlas Mountain areas were affected, including 100,000 children. The scale of the humanitarian crisis prompted Morocco to announce a three-day period of national mourning. Many countries offered humanitarian assistance in the immediate aftermath, reflecting the international concern for the victims and the severity of the infrastructure damage. The rapid mobilization of aid highlighted the urgent need for medical supplies, shelter, and logistical support in the remote mountainous regions hardest hit by the quake.
The destruction of historic landmarks in Marrakesh represented a significant loss for the region's cultural heritage. The city, founded circa 1070, is a UNESCO World Heritage Site with structures dating back to the Almoravid dynasty. The red walls built in 1122–1123 and subsequent sandstone buildings define its character. The earthquake's impact on these sites underscored the vulnerability of historical infrastructure to seismic events. The loss of these landmarks marked a tangible reduction in the physical heritage of the Maghreb's cultural and trading center. Restoring these structures will require extensive conservation efforts to preserve the architectural integrity of the city's historic core.
Institutional Reactions and Scheduling Changes
In response to the disaster, the Confederation of African Football (CAF) postponed the TotalEnergies Africa Cup of Nations Côte d’Ivoire 2023 Qualifier match between Morocco and Liberia. The match was originally scheduled for September 9, 2023, at 19:00 Morocco Time in Agadir. CAF expressed condolences to the families of the deceased, the Fédération Royale de Football, and the people of Morocco. A new date for the match was to be announced in due course, reflecting the disruption to national sporting events caused by the earthquake. The decision to postpone the game allowed for a pause in national activities to focus on relief efforts and mourning.
CAF also mandated a moment of silence before all AFCON Qualifier matches on September 9 and 10, 2023. This gesture was intended to acknowledge and honor the people who lost their lives in the tragedy. The decision to pause sporting activities and observe silence demonstrated the immediate institutional recognition of the disaster's impact. The postponement and tribute highlighted the intersection of national crisis and international sporting schedules, prioritizing humanitarian response over competitive events. This coordinated response from football authorities signaled a unified front in supporting the affected communities during the initial phase of the crisis.
Timeline: Magnitude 6.9 earthquake strikes Morocco
- 1960 Agadir earthquake occurs
- 1980 El Asnam earthquake in Algeria
- 2004 Al Hoceima earthquake in Morocco
- 2006 Mozambique earthquake (Mw 7.0)
- 2023-09-08 Magnitude 6.9 earthquake strikes Al Haouz Province
- 2023-09-09 CAF postpones Morocco vs Liberia match
Related on thisDay
Cite this page
“What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event?” thisDay, thisday.info/history/2023-al-haouz-earthquake-2023/. Accessed 19 Oct. 2026.
What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event? (n.d.). thisDay. Retrieved October 19, 2026, from https://thisday.info/history/2023-al-haouz-earthquake-2023/
“What caused the 2023 Al Haouz earthquake to become Morocco's strongest recorded event?” thisDay. Accessed October 19, 2026. https://thisday.info/history/2023-al-haouz-earthquake-2023/.