Earthquake Information: low mag. 2.5 earthquake – 2km ESE from Larkfield-Wikiup, CA, Friday August 27, 2021 11:11 (GMT -7)

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Update: August 28, 2021 00:15 GMT –

Low magnitude earthquake 2.5 to 0 km deep

27 Aug 18:14 UTC: First to report: USGS after 2 minutes.

Updated Fri Aug 27 2021, 6:32 PM

A small tremor of magnitude 2.5 has just been reported 4 miles northwest of Santa Rosa, California, United States

2.5 earthquake 2km ESE of Larkfield-Wikiup, CA, August 27, 2021 11:11 (GMT -7)

2.5 earthquake 2km ESE of Larkfield-Wikiup, CA, August 27, 2021 11:11 (GMT -7)

Just 21 minutes ago, a magnitude 2.5 earthquake struck near Santa Rosa, Sonoma County, California, United States. The tremor was recorded on the morning of Friday, August 27, 2021 at 11:11 a.m. local time, at a very shallow depth of 0.2 mile below the surface.
The event was classified by the United States Geological Survey, the first seismological agency to report it.
A second report was then released by the Euro-Mediterranean Seismological Center (EMSC), which also listed it as a magnitude 2.5 earthquake.
Based on preliminary seismic data, the quake should not have caused significant damage, but was likely felt by many as a slight vibration in the epicenter area.
Weak tremors may have been felt at Larkfield-Wikiup (population 8,900) located 1 mile from the epicenter.
Other towns near the epicenter where the earthquake could have been felt as a very weak tremor include Santa Rosa (pop. 175,000) located 4 miles from the epicenter, Windsor (pop. 27,500) 6 miles away. and Roseland (6,300 pop.) 6 miles away. In Healdsburg (11,700 inhabitants, 17 km), Russian River (11,700 inhabitants, 17 km), Rohnert Park (42,400 inhabitants, 17 km), Petaluma (60,400 inhabitants, 30 km) and Napa (pop . 80,400, 28 miles), the earthquake was probably not felt.

If you were or still are in this area during the earthquake help others with your feedback and file a quick report here.

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Earthquake data:

I felt this tremor

I didn’t feel it

Date and Time: Aug 27, 2021 6:11:49 PM UTC –
Local time at epicenter: Friday August 27, 2021 11:11 (GMT -7)
Magnitude: 2.5

Depth: 0.4 km
Latitude / longitude of epicenter: 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 villages:
2 km (1 mi) ESE of Larkfield-Wikiup (Sonoma County) (pop: 8,880) -> See nearby earthquakes!
7 km (4 mi) NNW of Holy rose (pop: 175,000) -> See nearby earthquakes!
9 km (6 mi) ESE of Windsor (Sonoma County) (pop: 27,500) -> Observe the earthquakes nearby!
14 km (9 mi) northeast of Sevastopol (pop: 7,680) -> Watch the earthquakes nearby!
17 km (11 mi) southeast of Healdsburg (Sonoma County) (pop: 11,700) -> Observe the earthquakes nearby!
17 km (11 mi) southeast of Russian river (pop: 11,700) -> Observe the earthquakes nearby!
18 km (11 mi) north of Rohnert Park (pop: 42,400) -> Observe the earthquakes nearby!
31 km (19 mi) NNW of Petaluma (pop: 60,400) -> Observe the earthquakes nearby!
45 km (28 mi) to WNW of Napa (pop: 80,400) -> Observe the earthquakes nearby!
85 km (53 mi) northwest of Concorde (pop: 128,700) -> See nearby earthquakes!

Weather at the epicenter at the time of the earthquake:
Mist 29.1 ° C (84 F), humidity: 40%, wind: 2 m / s (4 kts) from S

Main data source: USGS (United States Geological Survey)

Estimated energy released: 3.5 x 108 joules (98.6 kilowatt-hours) More info

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If you felt this tremor (or if you were near the epicenter), share your experience and submit a short “I felt it” report! Other users would love to hear about it!
Also if you did NOT feel the tremor even if you were in the area, please report it! Your contribution is also valuable to earthquake science and seismic risk analysis and mitigation efforts. You can use your device’s location or the map to show where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the seismic parameters to be calculated with near optimum accuracy.

Mag. Depth Site Source
2.5 0.4 km 2km ESE from Larkfield-Wikiup, CA USGS
unknown n / A Near Santa Rosa, California, United States VolcanoDiscovery
2.5 0 km NORTHERN CALIFORNIA EMSC

User reports for this earthquake (19)

With a magnitude of 2.5, this earthquake could have been felt very close to the epicenter and under calm conditions.

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Santa Rosa, Kaiser Hospital / Very low tremor (MMI II) / single vertical hump / very short : One bump. I asked everyone in the hospital office if they were feeling it and they said no. They thought I was crazy until I showed them this. | One user found this interesting.

Santa Rosa, Sonoma, CA (5.3 km S of epicenter) [Map] / not felt

Santa Rosa, Kaiser Hospital / Very low tremor (MMI II) / single vertical hump / very short : One bump. I asked everyone in the hospital office if they were feeling it and they said no. They thought I was crazy until I showed them this.

Holy rose / Weak shaking (MMI III) / 1-2 s : Very fast (1-2 seconds). It reminded me of the rumbling sensation when a generator shuts down.

4852 Londonberry Street / Low shaking (MMI III) / vertical and horizontal sway / very short : I also heard a boom when the house shook.

95401 / Very weak agitation (MMI II) / 2-5 s

Thomas Jarrett – working in my home office. / Slight shaking (MMI IV) / 5-10 s : Initial shake, then a loud bang with a hard jerk, then a short delay, more jolts than another bang and not as loud as a jerk, then a few jolts then finished.

Holy rose / Weak shaking (MMI III) / vertical and horizontal oscillation / 2-5 s : Windows shook

Windsor / not felt : Nothing felt

Santa Rosa, California / Very weak tremors (MMI II) / rattling, vibrations / 1-2 s

Holy rose / very weak shaking (MMI II) / single side shaking / very short : Short shaking motion

Santa Rosa, ca / Very weak tremor (MMI II) / single vertical bump / 1-2 s : A jolt

Holy rose / not felt : The windows were shaking a little. It looked like something was falling outside. The dog barked and was surprised.

Airport Boulevard is 95403. Home in my apt. Placard (3.5 km WNW from epicenter) [Map] / Very weak tremors (MMI II) / rattling, vibrations / 1-2 s : Rattling and shaking of the walls. I thought someone had slammed a door.

Santa Rosa California (Larksfield / Wikiup) (1.8 km at WNW from epicenter) [Map] / Very weak tremor (MMI II) / single vertical bump / 1-2 s : Single drop, very loud noise from the house, like an accident.

santa rosa california (5.5 km SW from epicenter) [Map] / Very weak shaking (MMI II) / very short : brief bump

Santa Rosa California Larkfield / Very low tremor (MMI II) / single vertical hump / very short

Santa Rosa (1.8 km WSW from epicenter) [Map] / Low shaking (MMI III) / single taxiing (lateral tilt in one direction) / 1-2 s : Rolling

Santa Rosa (1.8 km WSW from epicenter) [Map] / Low shaking (MMI III) / single taxiing (lateral tilt in one direction) / 1-2 s : Rolling

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