Quake Info: Moderate Mag. 3.9 Earthquake - Oriental, 30 km Northeast of Al Hoceima, Morocco, on Saturday, Oct 23, 2021 at 8:54 pm (GMT +1)

Moderate magnitude 3.9 earthquake at 10 km depth

23 Oct 19:57 UTC: First to report: EMSC after 3 minutes.
23 Oct 20:12: Magnitude recalculated from 3.5 to 4.1. Hypocenter depth recalculated from 10.0 to 23.0 km (from 6.2 to 14.3 mi). Epicenter location corrected by 47 km (29 mi) towards NNW.
... [show all] ...
23 Oct 20:50: Hypocenter depth recalculated from 20.0 to 10.0 km (from 12.4 to 6.2 mi). Epicenter location corrected by 6.7 km (4.2 mi) towards S.

Earthquake details

Date & time	Oct 23, 2021 19:54:01 UTC
Local time at epicenter	Saturday, Oct 23, 2021 at 8:54 pm (GMT +1)
Status	Confirmed
Magnitude	3.9
Depth	10.0 km
Epicenter latitude / longitude	35.4°N / 3.66°W (Alboran Sea, Oriental, Morocco)
Antipode	35.4°S / 176.34°E
Shaking intensity	Weak shaking
Felt	17 reports
Primary data source	EMSC (European-Mediterranean Seismological Centre)
Nearest volcano	###NEARESTVOLCANO2###
Nearby towns and cities	30 km (19 mi) NE of Al Hoceima (Tanger-Tetouan-Al Hoceima) (pop: 395,600) \| Show on map \| Quakes nearby 32 km (20 mi) NE of Tirhanimîne (Tanger-Tetouan-Al Hoceima) (pop: 55,800) \| Show on map \| Quakes nearby 33 km (21 mi) NNE of Imzouren (Tanger-Tetouan-Al Hoceima) (pop: 40,000) \| Show on map \| Quakes nearby 37 km (23 mi) NNE of Bni Bouayach (Province de Al Hoceïma, Tanger-Tetouan-Al Hoceima) (pop: 18,300) \| Show on map \| Quakes nearby 52 km (33 mi) NNW of Midar (Province de Driouch) (pop: 10,200) \| Show on map \| Quakes nearby 71 km (44 mi) WNW of Nador (pop: 129,300) \| Show on map \| Quakes nearby 73 km (46 mi) NW of Al Aaroui (Nador Province) (pop: 36,000) \| Show on map \| Quakes nearby 98 km (61 mi) WNW of Zaïo (Province de Nador) (pop: 30,000) \| Show on map \| Quakes nearby 178 km (111 mi) WNW of Oujda (pop: 405,300) \| Show on map \| Quakes nearby 329 km (204 mi) ENE of Rabat (Rabat-Salé-Kénitra) (pop: 1,655,800) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Clear Sky 19.2°C (66 F), humidity: 73%, wind: 5 m/s (10 kts) from E
Estimated seismic energy released	4.5 x 10¹⁰ joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) \| about seismic energy

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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag.	Depth	Location	Source
3.9	10 km	Morocco: STRAIT OF GIBRALTAR	EMSC
3.7	8 km	Morocco: ALBOR	IGN

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Seismograms

Seismic station: Rabat, Morocco (RTC/MN network) | Distance from quake: 332 km / 206 mi | Show on map | Station Info

Seismic station Rabat, Morocco: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (18)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Melilla (64.7 km E of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Sentado en el sofá viendo la tele , sentí el temblor de la vivienda de 3 a 5 segundos , la sacudida fue suave pero notable | 3 users found this interesting.

Málaga (164 km NNW of epicenter) [Map] / Very weak shaking (MMI II) / complex motion difficult to describe / 2-5 s : Me encontraba en mi terraza cuándo de pronto noté un zumbido y una pequeña vibración que provenía del Mar.

Al hoceima Ajdir / not felt / horizontal (sideways) swinging / 5-10 s : Wow wow | 2 users found this interesting. (reported through our app)

Melilla (67 km E of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : En la cuarta planta a 50 m del mar. Unos 6 segundos de duración. | One user found this interesting.

near Midar, Nador, Oriental (52.9 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 10-15 s : I was resting in my room in 2nd floor | One user found this interesting.

Nador morocco / Moderate shaking (MMI V) / single lateral shake / very short : Nador. I felt the house shaking. As I experienced the earthquake, I mostly feel it whenever I'm, awake or asleep. (reported through our app)

Ihaddaden (67.8 km ESE of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s : Secouse vibration et claque porte

Beni chiker Tafrast Nador Marokko (60.1 km E of epicenter) [Map] / Light shaking (MMI IV) : 3,5

Melilla (68.1 km E of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 5-10 s

Tirhanimîne, Al-Hoceima, Tanger-Tetouan-Al Hoceima (32.5 km SW of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / 1-2 s (reported through our app)

Melilla (65.9 km E of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s (reported through our app)

Melilla (64.8 km E of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : .....

Melilla (66.5 km E of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s

Melilla / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Melilla

Melilla / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s

imzouren / Very weak shaking (MMI II) / horizontal (sideways) swinging / 1-2 s

Melilla / Weak shaking (MMI III) / 15-20 s

Melilla / Light shaking (MMI IV) / single lateral shake (reported through our app)

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