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Light mag. 3.8 earthquake - 18 mi southwest of Chico, Butte County, California, USA, on Sunday, Dec 27, 2020 at 6:44 am (GMT -8)

Light mag. 3.8 earthquake - 18 mi southwest of Chico, Butte County, California, USA, on Sunday, Dec 27, 2020 at 6:44 am (GMT -8) Light mag. 3.8 earthquake - 18 mi southwest of Chico, Butte County, California, USA, on Sunday, Dec 27, 2020 at 6:44 am (GMT -8)

Light magnitude 3.8 earthquake at 26 km depth

27 Dec 14:48 UTC: First to report: USGS after 3 minutes.
27 Dec 16:20: Magnitude recalculated from 3.9 to 3.8.
27 Dec 22:24: Hypocenter depth recalculated from 24.6 to 26.9 km (from 15.3 to 16.7 mi). Epicenter location corrected by 1.6 km (1 mi) towards N.
27 Dec 22:40: Hypocenter depth recalculated from 26.9 to 26.4 km (from 16.7 to 16.4 mi).
Update Sun, 27 Dec 2020, 14:54
Small 3.9 quake hits near Willows, Glenn County, California, United States
3.9 quake 27 Dec 6:44 am (GMT -8)
3.9 quake 27 Dec 6:44 am (GMT -8)
The United States Geological Survey (USGS) reported a magnitude 3.9 quake in the United States near Willows, Glenn County, California, only 9 minutes ago. The earthquake hit early morning on Sunday 27 December 2020 at 6:44 am local time at a shallow depth of 15 miles. 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 3.9 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 Willows (pop. 6,100) located 10 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Durham (pop. 5,500) located 16 miles from the epicenter, Biggs (pop. 1,700) 17 miles away, Chico (pop. 90,300) 19 miles away, Colusa (pop. 5,900) 19 miles away, Gridley (pop. 6,600) 19 miles away, Orland (pop. 7,600) 20 miles away, and Yuba City (pop. 66,900) 32 miles away.

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Earthquake data

Earthquake details

Date & timeDec 27, 2020 14:44:40 UTC
Local time at epicenterSunday, Dec 27, 2020 at 6:44 am (GMT -8)
StatusConfirmed
Magnitude3.8
Depth26.4 km
Epicenter latitude / longitude39.50583°N / 122.01767°W (Glenn, California, United States)
Antipode39.506°S / 57.982°E
Shaking intensityWeak shaking
Felt155 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (87 km / 54 mi)
Nearby towns and cities11 km (7 mi) N of Princeton (pop: 303) | Show on map | Quakes nearby
15 km (9 mi) E of Willows (Glenn County) (pop: 6,070) | Show on map | Quakes nearby
29 km (18 mi) SSW of Chico (pop: 90,300) | Show on map | Quakes nearby
31 km (19 mi) SSE of Orland (Glenn County) (pop: 7,550) | Show on map | Quakes nearby
32 km (20 mi) WNW of Gridley (pop: 6,580) | Show on map | Quakes nearby
39 km (25 mi) W of Oroville (pop: 16,300) | Show on map | Quakes nearby
44 km (27 mi) SW of Paradise (Butte County) (pop: 26,500) | Show on map | Quakes nearby
53 km (33 mi) NW of Yuba City (pop: 66,900) | Show on map | Quakes nearby
105 km (65 mi) NW of Roseville (pop: 130,300) | Show on map | Quakes nearby
112 km (70 mi) NNW of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 5°C (41 F), humidity: 80%, wind: 2 m/s (3 kts) from SE
Estimated seismic energy released3.2 x 1010 joules (8.78 megawatt hours, equivalent to 7.56 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
3.826 km15km E of Willows, CA, USAUSGS
3.826 kmNORTHERN CALIFORNIA, USAEMSC

User reports for this quake (181)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Willows / Moderate shaking (MMI V) / 5-10 s : I rolled to floor and covered the back of my head with my palms. I whimpered and start to cry like little girl. I forget who I am or what it is going on by pretending my pony tails are not fake ones hold on by duct tape. The ground rumble noise, picture o | 5 users found this interesting.  
Chico CA / Very weak shaking (MMI II) / single vertical bump / very short : I live in an old farm cottage and i was reading when the house "jolted" a little and then immediately once more stronger. I didnt know if something had fallen on the cottage because i could hear it mostly in the roof. Then i saw water in tea kettle was sw | 5 users found this interesting.  
Biggs,CA (28.2 km ESE of epicenter) [Map] / Weak shaking (MMI III) : Felt like a huge ag equipment passing but not accompanied by any motor sounds. And the pattern of vibration shaking was not predictable like an approaching/passing typical large too many tons truck. | 4 users found this interesting.  
gridley, CA / Light shaking (MMI IV) / 1-2 s : First heard sound as a slamming door. A couple seconds later quaked. Not rolling more jolt. I was awake already. | 4 users found this interesting.  
Gridley / Moderate shaking (MMI V) / very short : I was laying in bed and my house just sounded and felt like it was going to collapse or being shaken. Hard to explain. Very scary. | 3 users found this interesting.  
Chico Ca / Moderate shaking (MMI V) / rattling, vibrating / 1-2 s : I was awake already and heard the vibration noise first then an intense jolt. It was over in a couple of seconds. I thought a car crashed in my yard. | 3 users found this interesting.  
GRASS VALLEY (89.4 km ESE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Apartment, single level, stilted on one side,entire length, hillside with 6' deep space beneath. My experience is that at 6:45 a.m. on 12/27/2020, I am sitting at my kitchen table, situated above the above described stilted apartment side, and felt a dist | 2 users found this interesting.  
Colfax, CA (101.4 km ESE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : I heard a rumbling outside that sounded like it was moving towards my home. Then there was a brief shake and the windows and some other things quickly rattled and then it was gone. | 2 users found this interesting.  
Nevada City California Red Dog Road / not felt / vibration and rolling / very short : I was lying in bed and felt a VERY fast moving rolling followed by the sound of the house creaking maybe 3 different times. Our house is on andesite on granite. Earthquakes up here are often heard before felt. There was no Shaking it was very fast rolling | 2 users found this interesting.  
Bieber ca (194.2 km NNE of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s : I was sitting in my recliner drinkung a cup of coffee, my bf was sitting on sofa across from me...i felt my seat rumble, as if I were in an idling pick up...i felt it in my stomach. It was real quick. I felt it, he told me I needed to quit smoking pot. | One user found this interesting.  
Gridley, ca (31.5 km ESE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s : Woke me up. I thought that it was a truck at first, but I realized a truck wouldn't have shaken my bed/wall. I then thought maybe it was thunder or an explosion, but didn't realize it was an earthquake until I saw the news. | One user found this interesting.  
216 Denali Dr (30.8 km NNE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 1-2 s : Heard quake before it arrived, rumbling followed by a loud crack of wood nearby. Single large shake. Items in house were disturbed. | One user found this interesting.  
Chico (29.6 km NNE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short : Woke me from sleep, felt the house slide out and then back. Almost like a large limb fell against the house, or maybe a truck backed into it. | One user found this interesting.  
Colfax, CA (101.4 km ESE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : I heard a rumbling outside that sounded like it was moving towards my home. Then there was a brief shake and the windows and some other things quickly rattled and then it was gone. | One user found this interesting.  
Biggs,CA (28.2 km ESE of epicenter) [Map] / Weak shaking (MMI III) : Felt like a huge ag equipment passing but not accompanied by any motor sounds. And the pattern of vibration shaking was not predictable like an approaching/passing typical large too many tons truck. | One user found this interesting.  
Live Oak (36.5 km SE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s : This was a very quick, single jolt that moved the sofa I was sitting on very slightly. I looked on your site because I thought it may have been a small quake. | One user found this interesting.  
  • Shook us out of bed Very quick but big jolt
Chico (31.6 km NNE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s : It felt like a wave of energy moved thru the entire apartment complex shaking the blinds and ceiling fans. | One user found this interesting.  
near Willows, Glenn, California (3.6 km E of epicenter) [Map] / Moderate shaking (MMI V) / simple rolling (tilting sideways along one direction) / 1-2 s : Heard thunder and then shaking | 2 users found this interesting.  
Gridley, ca / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Shook the house twice,felt like a far away explosion under our feet, we went outside to see what it was, the neighbors met us out on the street, they felt it also. | One user found this interesting.  
Orangevale / Very weak shaking (MMI II) : A very light shift maybe 3 waves seconds to minutes of each one, cat acting unusual running about and protective, I was laying on bed, my head was north my feet south | One user found this interesting.  
Yuba City / Light shaking (MMI IV) / very short : I was laying in bed, heard a loud noise felt the house shake and wondered what the heck is that, then it was over. Kinda scared me. | One user found this interesting.  
Gridley, California / Very weak shaking (MMI II) : I was awake in bed, felt very minor movement. If I had not been awake I don’t think it would of woke me. Thought it might be earthquake checked phone and saw there had been minor quake near Willows. | One user found this interesting.  
Placerville, Ca / Light shaking (MMI IV) / single lateral shake / 5-10 s : Felt one large shake/jolt and then vibration feeling for a few seconds after. Initial jolt woke my daughter upstairs sleeping. | One user found this interesting.  
Grass Valley, CA, home in desk chair / Light shaking (MMI IV) / 1-2 s : Not rolling. A jolt that was felt and heard by myself and my husband who was in a different room in the house. | One user found this interesting.  
Gridley / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : 2 back-to-back instances. First was a very short “bump” feeling. Second instance had: Walls creaked, windows rattled, couch jerked, mandarin rolled off the top of a fruit centerpiece. Husband slep through it. | One user found this interesting.  
Live Oak, Ca. / Very weak shaking (MMI II) / single lateral shake / very short : Felt in Live Oak, Ca. off of North Butte Rd. I was awakened out of a dead sleep and my whole family woke up thinking something hit the house, like a car or I thought that one of my parents fell down in the house somewhere. An initial shake then done by th | One user found this interesting.  
Chico Ca / Moderate shaking (MMI V) / rattling, vibrating / 1-2 s : I was awake already and heard the vibration noise first then an intense jolt. It was over in a couple of seconds. I thought a car crashed in my yard. | One user found this interesting.  
Willows / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Having experienced many earthquakes while living 1984-1985 in Los Angeles, compared to those earthquakes, this one felt milder shaking than what was described as a 5 then and was for shorter duration and more rapid shaking and lasted a couple of seconds. | One user found this interesting.  
Live Oak, Ca. / Very weak shaking (MMI II) / single lateral shake / very short : Felt in Live Oak, Ca. off of North Butte Rd. I was awakened out of a dead sleep and my whole family woke up thinking something hit the house, like a car or I thought that one of my parents fell down in the house somewhere. An initial shake then done by th | One user found this interesting.  
11437 Ball Road, Grass Valley, CA / Light shaking (MMI IV) : I was having my coffee and felt the light shaking that went for about 20 seconds...heard my glassware shake in the curio. | One user found this interesting.  
Chico, California / Light shaking (MMI IV) / 5-10 s : I thought it was a large truck passing at first but it lasted too long and shook harder than passing traffic. In bed at the time. | One user found this interesting.  
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