A very strong earthquake registered by the USGS as M6.2 hit near the coast of Petrolia, California, U.S. at 20:10 UTC on December 20, 2021. The agency is reporting a depth of 9.3 km (5.8 miles). EMSC is reporting M6.2 at a depth of 15 km (9.3 miles).
The epicenter was located about 38 km (24 miles) W of Petrolia and 72 km (44 miles) SW of Eureka, California.
3 000 people are estimated to have felt very strong shaking, 21 000 strong, 45 000 moderate and 86 000 light.
There is no tsunami threat from this earthquake.
The USGS issued a Green alert for shaking-related fatalities. There is a low likelihood of casualties.
Image credit: TW/SAM, Google
A Yellow alert was issued for economic losses. Some damage is possible and the impact should be relatively localized. Estimated economic losses are less than 1% of GDP of the United States.
Past events with this alert level have required a local or regional level response.
Overall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.
Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.
Estimated population exposure to earthquake shaking
Selected cities exposed
Featured image credit: TW/SAM, Google
If you value what we do here, create your ad-free account and support our journalism.
Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.
Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.
All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.
You can choose the level of your support.
Stay kind, vigilant and ready!