HUMBOLDT COUNTY, CA — A 5.1 magnitude quake jolted close to Petrolia on Wednesday morning, the U.S. Geological Survey reported.

At 12:45 p.m. (4:45 a.m. local time), a tremor shook the region at a depth of 6 miles, with its epicenter roughly 39 miles west of Petrolia. Seismologists first reported it as a 4.8 event, but later upgraded it to 5.1.

Did you feel it?

If you felt the earthquake, you can submit a report via the USGS Felt Report form. 125 people have submitted responses through the agency’s online form, indicating they felt weak shaking. Residents reported experiencing the quake in a number of cities, such as Blue Lake, McKinleyville, Garberville, Myers Flat and Bayside according to the USGS DYFI report.

Impact and estimated losses

The USGS categorized this as a Green Alert, which means there is a low likelihood of casualties and damage. Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.

Structure information summary
Most structures in this region are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.

Last week’s tremor

A magnitude 2.8 quake was recorded in the region over the last week; it occurred near Ferndale on May 28.

Source: The U.S. Geological Survey