Strong mag. 5.5 earthquake - Gulf of California, 63 km southwest of Guaymas, Sonora, Mexico, on 2021-07-31 10:39:19 (Hora de México) -

Strong mag. 5.5 earthquake - Gulf of California, 63 km southwest of Guaymas, Sonora, Mexico, on 2021-07-31 10:39:19 (Hora de México)

Strong magnitude 5.5 earthquake at 5 km depth

31 Jul 15:44 UTC: First to report: VolcanoDiscovery after 6 minutes.
31 Jul 15:48: Now using data updates from GFZ
31 Jul 16:07: Now using data updates from SSN
Update Sat, 31 Jul 2021, 15:54
Significant earthquake of magnitude 5.0 just reported 82 km southwest of Guaymas, Mexico
5.0 quake 31 Jul 8:39 am (GMT -7)
5.0 quake 31 Jul 8:39 am (GMT -7)
An earthquake of magnitude 5.0 occurred in the morning on Saturday 31 July 2021 at 8:39 am local time near Guaymas, Sonora, Mexico, as reported by the German Research Centre for Geosciences (GFZ).
According to preliminary data, the quake was located at a shallow depth of 10 km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 5.0 earthquake as well.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Isla San Marcos (pop. 390) located 62 km from the epicenter, Mulegé (pop. 3,900) 75 km away, Santa Rosalia (pop. 11,800) 75 km away, San Carlos (pop. 2,300) 75 km away, Guaymas (pop. 113,100) 82 km away, San José de Guaymas (pop. 1,100) 88 km away, and Empalme (pop. 42,500) 91 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.
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Earthquake data

Date & time: Jul 31, 2021 15:39:19 UTC -
Local time at epicenter: 2021-07-31 10:39:19 (Hora de México)
Magnitude: 5.5
Depth: 5.0 km
Epicenter latitude / longitude: 27.63°N / 111.45°W (Gulf of California, Mexico)
Antipode: 27.63°S / 68.55°E
Nearest volcano: Isla Tortuga (37 km / 23 mi)
Nearby towns and cities:
50 km (31 mi) SW of La Manga (pop: 146) --> See nearby quakes!
63 km (39 mi) WSW of Guaymas (pop: 113,100) --> See nearby quakes!
73 km (45 mi) WSW of Empalme (pop: 42,500) --> See nearby quakes!
87 km (54 mi) ENE of Santa Rosalia (pop: 11,800) --> See nearby quakes!
94 km (58 mi) SW of Santa Maria de Guaymas (pop: 1,470) --> See nearby quakes!
98 km (61 mi) NNE of Mulegé (pop: 3,850) --> See nearby quakes!
135 km (84 mi) S of Miguel Aleman (La Doce) (Miguel Alemán) (pop: 30,900) --> See nearby quakes!
150 km (93 mi) W of Ciudad Obregon (pop: 298,600) --> See nearby quakes!
150 km (93 mi) W of Esperanza (pop: 39,000) --> See nearby quakes!
170 km (106 mi) SSW of Hermosillo (pop: 715,100) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 33.1°C (92 F), humidity: 68%, wind: 2 m/s (4 kts) from NNW
Primary data source: SSN (Servicio Sismológico Nacional)
Estimated released energy: 1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) More info
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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.DepthLocationSource
5.55 kmMexico: 63 Km Al SUROESTE De H GUAYMAS, SONSSN
5.52 kmMexico: GULF OF CALIFORNIAEMSC
5.510 km65 Km SW of San Carlos, MexicoUSGS
5.010 kmMexico: Near HermosilloRENASS
5.510 kmMexico: Gulf of CaliforniaGFZ
5.510 kmMexico: Gulf of CaliforniaGeoAu

User reports for this quake (54)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Empalme, Sonora (72.1 km ENE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 30-60 s : It was so strong that it woke me up, my bed was moving from side to side and I could hear the windows shaking | 4 users found this interesting.  
Hermosillo, Sonora / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : I felt like I was dizzy | 4 users found this interesting.  
Hermosillo / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : I was on my bed in the second floor, so I feel it because my head was resting in the wall and then I saw my chair and bookshelf vibrate, for a few seconds. | 2 users found this interesting.  
HERMOSILLO AT 8 AM, TABLE MOVEMENT (255.5 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / very short : table movement, walls, | One user found this interesting.  
Hermosillo, Sonora (165.7 km NNE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : house moving side to side | One user found this interesting.  
Hermosillo (168.2 km NNE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 2-5 s : Was on bed and awaken by the room moving side to side. | One user found this interesting.  
Hermosillo / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s : felt bed moved. clothes swing hanging in closet | One user found this interesting.  
Empalme (75.5 km ENE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s : All my water containers began to shake. Doors and shelves shook to. Pets got inside the house. | One user found this interesting.  
Guaymas (63 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : noise in we=indows like a heavy car passing thru all house shake windows | One user found this interesting.  
North Pacific Ocean (636.7 km NW of epicenter) [Map] / not felt
Empalme, Sonora (75.1 km ENE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Empalme, Sonora (71.4 km ENE of epicenter) [Map] / Light shaking (MMI IV) / complex motion difficult to describe / 5-10 s
near Hermosillo, Sonora (162.6 km NNE of epicenter) [Map] / not felt : Other people did (reported through our app)  
Hermosillo (165.3 km NNE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Vibratiln  
Guaymas, Sonora (61.3 km NE of epicenter) [Map] / Weak shaking (MMI III) / 15-20 s : I am very scared  
San Carlos, Guaymas, Sonora (49.3 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : A  
Hermosillo (171.1 km NNE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s
San Fernando, Los Angeles, California (998.5 km NW of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Guaymas sonora (60.4 km NE of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / 10-15 s
Guaymas (65.7 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : Noisy  
Hermosillo / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s
San carlos, sonora, Mexico / Weak shaking (MMI III) / rattling, vibrating / 15-20 s
Hermosillo / Very weak shaking (MMI II) / single lateral shake / 2-5 s
Sandy, People's Republic of Utah (1437.4 km N of epicenter) [Map] / not felt : Didn't feel it, but your mom did. (reported through our app)  
San carlos sonora mexico / Very weak shaking (MMI II) / horizontal (sideways) swinging / 15-20 s : Woke up by sideway movements while in bed.. looked across the room to see my wife and daughter on the other bed shaking sideways as well.. go up from bed and kept shaking sideways while i was standing up standing up.  
HERMOCILLO,SON,MX. / Very weak shaking (MMI II) / single lateral shake / 15-20 s
Esstvale, California. (916.4 km NW of epicenter) [Map] / not felt (reported through our app)
Hermosillo / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : I felt softly swimming. My glassdoors moved  
Hermosillo,Sonora. México. / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : Sentada con el respaldo pegado a la pared, sentí que me movió del respaldo de derecha a izquierda en varias ocasiones, me quedé quieta para ver si se repetía y sí, fue muy evidente el movimiento de un lado a otro, pero sin desplazamiento de la silla.  
Empalme Sonora / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Me impresione  
San Carlos, Mexico (75 km E of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 15-20 s
Hermosillo Sonora / Light shaking (MMI IV) / very short : Just a little shake. One second or less.  
Hermosillo (169.3 km NNE of epicenter) [Map] / not felt : I was sleeping but I read that some friends did felt it  
Hermosillo / Weak shaking (MMI III) / vibration and rolling / 10-15 s
hermosillo / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
hermosillo / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
hermosillo (126.5 km N of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 10-15 s
Hermosillo / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
Hermosillo Sonora / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Guaymas sonora / Light shaking (MMI IV) / rattling, vibrating / 5-10 s
Guaymas / Weak shaking (MMI III) / 2-5 s
Hermosillo / Very weak shaking (MMI II) / horizontal (sideways) swinging / 1-2 s
Hermosillo / Weak shaking (MMI III) / 5-10 s : Trono la casa  
Hermosillo / Light shaking (MMI IV) / 30-60 s
Guaymas sonora mexico / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : Se sintió mucha vibración y mucho ruido estábamos en planta baja unos sentados otros parados sonaban las ventanas y en la planta alta se oía mas  
Hermosillo (168.4 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
Hermosillo / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Hermosillo / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s
santa rosa / Strong shaking (MMI VI)
HERMOSILLO / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s
Hermosillo (174.2 km NNE of epicenter) [Map] / not felt (reported through our app)
Hermosillo / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Guaymas (63 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : noise in we=indows like a heavy car passing thru all house shake windows  
Hermosillo, Son (165.8 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / vibration and rolling / 2-5 s : La puerta de mi habitación y mi cama empezaron a producir un ruido, como si se estuvieran balanceando ligeramente.  
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Aftershocks

More info

Recorded aftershocks, latest first (18 quakes)

  • 27 Sep 2021 21:24 UTC
    | M 4.0 |
    16 km (9.9 mi) depth
    |
    31 km (19 mi) distance
    | SSN | Details
  • 03 Sep 2021 21:55 UTC
    | M 3.7 |
    20 km (12.4 mi) depth
    |
    25 km (15 mi) distance
    | SSN | Details
  • 03 Sep 2021 21:44 UTC
    | M 3.7 |
    20 km (12.4 mi) depth
    |
    24 km (15 mi) distance
    | SSN | Details
  • 28 Aug 2021 06:02 UTC
    | M 3.6 |
    16 km (9.9 mi) depth
    |
    25 km (15 mi) distance
    | SSN | Details
  • 19 Aug 2021 21:16 UTC
    | M 3.5 |
    16 km (9.9 mi) depth
    |
    18 km (11 mi) distance
    | SSN | Details
  • 19 Aug 2021 21:14 UTC
    | M 3.4 |
    16 km (9.9 mi) depth
    |
    24 km (15 mi) distance
    | SSN | Details
  • 19 Aug 2021 17:22 UTC
    | M 2.7 |
    13 km (8.1 mi) depth
    |
    20 km (12 mi) distance
    | SSN | Details
  • 19 Aug 2021 09:38 UTC
    | M 3.3 |
    15 km (9.3 mi) depth
    |
    25 km (16 mi) distance
    | SSN | Details
  • 18 Aug 2021 05:21 UTC
    | M 3.3 |
    10 km (6.2 mi) depth
    |
    24 km (15 mi) distance
    | SSN | Details
  • 09 Aug 2021 18:13 UTC
    | M 4.0 |
    10 km (6.2 mi) depth
    |
    11 km (7 mi) distance
    | SSN | Details
  • 08 Aug 2021 07:31 UTC
    | M 2.8 |
    20 km (12.4 mi) depth
    |
    9 km (6 mi) distance
    | SSN | Details
  • 04 Aug 2021 08:45 UTC
    | M 3.7 |
    10 km (6.2 mi) depth
    |
    3 km (2 mi) distance
    | SSN | Details
  • 02 Aug 2021 16:29 UTC
    | M 3.9 |
    13 km (8.1 mi) depth
    |
    13 km (8 mi) distance
    | SSN | Details
  • 01 Aug 2021 15:05 UTC
    | M 4.1 |
    10 km (6.2 mi) depth
    |
    16 km (10 mi) distance
    | SSN | Details
  • 01 Aug 2021 09:50 UTC
    | M 4.0 |
    8 km (5 mi) depth
    |
    2 km (1 mi) distance
    | SSN | Details
  • 31 Jul 2021 21:07 UTC
    | M 4.3 |
    10 km (6.2 mi) depth
    |
    10 km (6 mi) distance
    | SSN | Details
  • 31 Jul 2021 20:27 UTC
    | M 4.3 |
    10 km (6.2 mi) depth
    |
    12 km (8 mi) distance
    | SSN | Details
  • 31 Jul 2021 16:13 UTC
    | M 4.0 |
    18 km (11.2 mi) depth
    |
    9 km (6 mi) distance
    | SSN | Details

Earlier earthquakes in the same area

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