Moderate mag. 4.7 earthquake - 11 mi southwest of Novato, Marin County, California, USA, on Monday, Dec 20, 2021 at 12:10 pm (GMT -8) -

Moderate mag. 4.7 earthquake - 11 mi southwest of Novato, Marin County, California, USA, on Monday, Dec 20, 2021 at 12:10 pm (GMT -8) Moderate mag. 4.7 earthquake - 11 mi southwest of Novato, Marin County, California, USA, on Monday, Dec 20, 2021 at 12:10 pm (GMT -8)

Moderate magnitude 4.7 earthquake at 17 km depth

20 Dec 20:16 UTC: First to report: VolcanoDiscovery after 5 minutes.
20 Dec 20:16: Now using data updates from RaspberryShake

Earthquake details

Date & timeDec 20, 2021 20:10:55 UTC -
Local time at epicenterMonday, Dec 20, 2021 at 12:10 pm (GMT -8)
StatusConfirmed
Magnitude4.7
Depth17.3 km
Epicenter latitude / longitude38.04039°N / 122.76278°W (Marin County, California, United States)
Antipode38.04°S / 57.237°E
Shaking intensityWeak shaking
Felt33 reports
Primary data sourceRaspberryShake (RaspberryShake)
Nearest volcanoClear Lake (103 km / 64 mi)
Nearby towns and cities5 km (3 mi) SE of Point Reyes Station (pop: 848) | Show on map | Quakes nearby
18 km (11 mi) WSW of Novato (pop: 55,500) | Show on map | Quakes nearby
22 km (13 mi) WNW of San Rafael (pop: 59,200) | Show on map | Quakes nearby
24 km (15 mi) SSW of Petaluma (pop: 60,400) | Show on map | Quakes nearby
38 km (24 mi) WNW of Richmond (pop: 109,700) | Show on map | Quakes nearby
42 km (26 mi) NW of San Francisco (pop: 864,800) | Show on map | Quakes nearby
45 km (28 mi) S of Santa Rosa (pop: 175,000) | Show on map | Quakes nearby
45 km (28 mi) W of Vallejo (pop: 121,300) | Show on map | Quakes nearby
109 km (68 mi) NW of San Jose (pop: 1,026,900) | Show on map | Quakes nearby
126 km (78 mi) WSW of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 9.2°C (49 F), humidity: 89%, wind: 1 m/s (2 kts) from S
Estimated seismic energy released7.1 x 1011 joules (197 megawatt hours, equivalent to 169 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.DepthLocationSource
4.717 kmNear Santa Cruz, California, USARaspberryShake

User reports for this quake (38)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Arcata California (332.9 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 30-60 s : Was laying in bed when the bed started shaking harshly! Alarmed family and pets and shook entire house lightly. | One user found this interesting.  
Willits / Weak shaking (MMI III) / 2-5 s : Chair shook gently, house made cracking noises,hanging lamp swayed, cats on alert, We stood up to decide what to do. Alert came just before motion. | One user found this interesting.  
Kaiser (48.7 km SE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 20-30 s : While sitting on the 5 th floor waiting room of a medical building. Noticed building movement back and forth also saw plexiglass screens moving. Some people did not notice. Others definitely did. 6.2 off of Eureka, ca.  
Anderson, CA (270.4 km N of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 15-20 s : Laying in bed and felt the bed shaking gently back and forth. Looked at surrounding objects and they were swaying as well.  
3179 california st, san francisco / Weak shaking (MMI III) / single lateral shake / very short : I felt a slight shake/jolt. Enough to cause me to pause and assess whether I needed to take more action. My building in San Francisco is a wooden structure, three stories high, pre-1906 earthquake, so it slightly rocked. Definitely enough to make me take   
Oildale, Kern, California (444.1 km SE of epicenter) [Map] / not felt (reported through our app)
San Francisco CA (41.8 km SE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 20-30 s
Outer Richmond Sam Francisco (37.1 km SE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s
San francisco (42.1 km SE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 s : It woke me up from a nap  
Santa Cruz (133.6 km SSE of epicenter) [Map] / Weak shaking (MMI III) / 1-2 s : I was upstairs, I felt shaking, and heard things shaking  
San Francisco (43.3 km SE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Thought it was people stomping for a moment  
Crescent city, ca. (428.2 km NNW of epicenter) [Map] / Light shaking (MMI IV) : Sitting on couch. Lampshades swinging, water shaking in glass  
Paradise, california (224.8 km NNE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s : Was watching TV and my trailer started shaking back and forth but the wind wasn't blowing  
Uniontown, Humboldt, California (335 km NNW of epicenter) [Map] / Strong shaking (MMI VI) / complex motion difficult to describe / 15-20 s
san francisco / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s
Marin / not felt : San Rafael had no falling items or signs of shaking.  
Marin / not felt : San Rafael had no falling items or signs of shaking.  
1960 jackson street san Francisco / Weak shaking (MMI III) / 10-15 s
Santa Cruz / Very weak shaking (MMI II) / horizontal (sideways) swinging / 15-20 s : I thought it was a truck on our street except for that it lasted too long. Felt like my couch was doing a little shimmy back-and-forth.  
lake merritt (52.1 km ESE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s
Santa Cruz / Very weak shaking (MMI II) / rattling, vibrating / 10-15 s : Windows shaking. Mostly noticeable because of the slight noise they made. (reported through our app)  
West Sacramento / not felt / 20-30 s : Ceiling Lamps swinging slightly for several seconds  
Susanville / not felt (reported through our app)
Walnut Creek / Very weak shaking (MMI II) / vibration and rolling / 10-15 s
Willits, California / Very weak shaking (MMI II) / horizontal (sideways) swinging / 15-20 s
Fortuna / Strong shaking (MMI VI) / 20-30 s
Eureka / Moderate shaking (MMI V) / horizontal (sideways) swinging / 30-60 s : Pretty strong, sideways rolling and shaking. Pictures down in house  
Lower Pac Heights, San Francisco, CA / Weak shaking (MMI III) / horizontal (sideways) swinging / 20-30 s
95503 / Moderate shaking (MMI V) / rattling, vibrating / 20-30 s
Mckinleyville / Weak shaking (MMI III) / 1-2 s
el Granada, ca / Light shaking (MMI IV) / 2-5 s
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