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Weak mag. 2.5 earthquake - 2km ESE of Larkfield-Wikiup, CA, on Friday, Aug 27, 2021 at 11:11 am (GMT -7) -

Weak mag. 2.5 earthquake - 2km ESE of Larkfield-Wikiup, CA, on Friday, Aug 27, 2021 at 11:11 am (GMT -7) Weak mag. 2.5 earthquake - 2km ESE of Larkfield-Wikiup, CA, on Friday, Aug 27, 2021 at 11:11 am (GMT -7)

Weak magnitude 2.5 earthquake at 0 km depth

27 Aug 18:14 UTC: First to report: USGS after 2 minutes.
Update Fri, 27 Aug 2021, 18:32
Small tremor of magnitude 2.5 just reported 4 miles northwest of Santa Rosa, California, United States
2.5 quake 2km ESE of Larkfield-Wikiup, CA, 27 Aug 2021 11:11 am (GMT -7)
2.5 quake 2km ESE of Larkfield-Wikiup, CA, 27 Aug 2021 11:11 am (GMT -7)
Just 21 minutes ago, a 2.5-magnitude earthquake struck near Santa Rosa, Sonoma County, California, USA. The tremor was recorded in the morning on Friday 27 August 2021 at 11:11 am local time, at a very shallow depth of 0.2 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 2.5 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 Larkfield-Wikiup (pop. 8,900) located 1 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Santa Rosa (pop. 175,000) located 4 miles from the epicenter, Windsor (pop. 27,500) 6 miles away, and Roseland (pop. 6,300) 6 miles away. In Healdsburg (pop. 11,700, 11 miles away), Russian River (pop. 11,700, 11 miles away), Rohnert Park (pop. 42,400, 11 miles away), Petaluma (pop. 60,400, 19 miles away), and Napa (pop. 80,400, 28 miles away), the quake was probably not felt.

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Earthquake data

Date & time: Aug 27, 2021 18:11:49 UTC -
Local time at epicenter: Friday, Aug 27, 2021 at 11:11 am (GMT -7)
Magnitude: 2.5
Depth: 0.4 km
Epicenter latitude / longitude: 38.50317°N / 122.7305°W (California, United States)
Antipode: 38.503°S / 57.27°E
Nearest volcano: Clear Lake (52 km / 32 mi)
Nearby towns and cities:
2 km (1 mi) ESE of Larkfield-Wikiup (Sonoma County) (pop: 8,880) --> See nearby quakes!
7 km (4 mi) NNW of Santa Rosa (pop: 175,000) --> See nearby quakes!
9 km (6 mi) ESE of Windsor (Sonoma County) (pop: 27,500) --> See nearby quakes!
14 km (9 mi) NE of Sebastopol (pop: 7,680) --> See nearby quakes!
17 km (11 mi) SE of Russian River (Sonoma County) (pop: 11,700) --> See nearby quakes!
17 km (11 mi) SE of Russian River (pop: 11,700) --> See nearby quakes!
18 km (11 mi) N of Rohnert Park (pop: 42,400) --> See nearby quakes!
31 km (19 mi) NNW of Petaluma (pop: 60,400) --> See nearby quakes!
45 km (28 mi) WNW of Napa (pop: 80,400) --> See nearby quakes!
85 km (53 mi) NW of Concord (pop: 128,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Haze 29.1°C (84 F), humidity: 40%, wind: 2 m/s (4 kts) from S
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.5 x 108 joules (98.6 kilowatt hours) | 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
2.50.4 km2km ESE of Larkfield-Wikiup, CAUSGS
2.50 kmNORTHERN CALIFORNIAEMSC

User reports for this quake (25)

At magnitude 2.5, this quake might have been felt very close to the epicenter and under calm conditions.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Santa rosa, kaiser hospital / Very weak shaking (MMI II) / single vertical bump / very short : A single bump. I asked everyone in the hospital office if they felt it and they said no. They thought i was crazy until I showed them this. | One user found this interesting.  
Santa Rosa, Sonoma, California (5.3 km S of epicenter) [Map] / not felt
santa rosa, ca / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : light shaking very quick  
Santa Rosa / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Holt  
Santa Rosa Coffey Park 2nd story home. / Very weak shaking (MMI II) / vibration and rolling / 1-2 s : wave roll from Northeast to South. Was on Second story of house. Felt more than first floor occupant.  
Santa rosa / Light shaking (MMI IV) / rattling, vibrating / 20-30 s
Larkfield wikiup area in Santa Rosa, CA / Light shaking (MMI IV) / vibration and rolling / 1-2 s : A very loud explosive sound, immediate shaking and rolling felt through the house. Shaking lasted less then 10 seconds. Talked to neighbor across the street who came out to see what was going on. Our immediate thought was that it must have been a near by   
Santa Rosa, ca Kaiser medical center / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : My computer monitor was shaking. It was scary.  
Santa rosa, kaiser hospital / Very weak shaking (MMI II) / single vertical bump / very short : A single bump. I asked everyone in the hospital office if they felt it and they said no. They thought i was crazy until I showed them this.  
Santa Rosa / Weak shaking (MMI III) / 1-2 s : Very quick (1-2 seconds). It reminded me of the rumbling feeling when a generator shuts down.  
4852 Londonberry dr / Weak shaking (MMI III) / both vertical and horizontal swinging / very short : Also heard a boom when the house shook.  
95401 / Very weak shaking (MMI II) / 2-5 s
Thomas Jarrett - working in my home office. / Light shaking (MMI IV) / 5-10 s : Initial shaking, then a loud bang with a hard jolt, then a brief delay, more shaking then another bang and not as hard of a jolt, then some shaking then done.  
Santa Rosa / Weak shaking (MMI III) / both vertical and horizontal swinging / 2-5 s : Windows shook  
Windsor / not felt : Felt nothing  
Santa Rosa, CA / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
Santa Rosa / Very weak shaking (MMI II) / single lateral shake / very short : Short jerk motion  
Santa rosa, ca / Very weak shaking (MMI II) / single vertical bump / 1-2 s : A jolt  
Santa Rosa / not felt : Windows rattled a little. Sounded as if something dropped outside. Dog barked and was startled.  
Airport blvd east 95403 . Home in my apt. Closet (3.5 km WNW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Rattling and shaking of walls. Thought someone slammed a door .  
Santa Rosa California (Larksfield/Wikiup) (1.8 km WNW of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / 1-2 s : Single drop, very loud noise from house, like a crash.  
santa rosa california (5.5 km SW of epicenter) [Map] / Very weak shaking (MMI II) / very short : brief bump  
Santa Rosa CA Larkfield / Very weak shaking (MMI II) / single vertical bump / very short
Santa Rosa (1.8 km WSW of epicenter) [Map] / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 1-2 s : Rolling  
Santa Rosa (1.8 km WSW of epicenter) [Map] / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 1-2 s : Rolling  
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