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https://www.sfgate.com/earthquakes/article/Earthquakes-California-Humboldt-Ferndale-12524938.php
Two earthquakes above magnitude 5.0 strike off Calif. coast
By Amy Graff, SFGATE and Greg Keraghosian
Updated 10:31 am, Thursday, January 25, 2018
Photo: USGS
Image 1 of 14
A magnitude 5.8 earthquake struck off the California Coast on January 25, 2018.
The quakes were well beneath the ocean and there were no initial reports of damage or injury. The NOAA reported that no tsunami was expected from the quakes.
The two morning earthquakes struck two days after a magnitude 7.9 quake in the Gulf of Alaska, which resulted in a tsunami watch that was later canceled.
The 5.8 earthquake struck at 8:39 a.m. about 115 miles west of Eureka, Calif., at a depth of 5 kilometers. The closest quake to shore came at 9:24 a.m. and had a magnitude of 5.0, according to the USGS. That one had a depth of 4 kilometers and was about 112 miles west of Ferndale.
"Historically this is a very active area, " said Keith Knudsen, deputy director of the Earthquake Science Center at the USGS. He said the quakes occurred at "the boundary between two plates that are moving relatively fast, past each other and we call this area the Mendocino Triple Junction, which implies there are three plates, and there are, but these particular quakes occurred in a boundary between two plates."
An overview of the San Andreas and Hayward faults.
Media: Martin do Nascimento
The USGS initially reported a third quake during the same hour with a 5.1 magnitude, but that turned out to be a duplicate report of the second, Knudsen said. He added that almost 150 people in the area reported light shaking.
The operators of the Victorian Inn in Ferndale said nobody on staff felt the shaking, but there was some talk around town about it.
More information on this earthquake is available on the USGS event page.
See the latest USGS quake alerts, report whether you felt earthquake activity and tour interactive fault maps in the earthquake section.
SFGATE's Amy Graff contributed to this story.
Two earthquakes above magnitude 5.0 strike off Calif. coast
By Amy Graff, SFGATE and Greg Keraghosian
Updated 10:31 am, Thursday, January 25, 2018
Photo: USGS
Image 1 of 14
A magnitude 5.8 earthquake struck off the California Coast on January 25, 2018.
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The quakes were well beneath the ocean and there were no initial reports of damage or injury. The NOAA reported that no tsunami was expected from the quakes.
The two morning earthquakes struck two days after a magnitude 7.9 quake in the Gulf of Alaska, which resulted in a tsunami watch that was later canceled.
The 5.8 earthquake struck at 8:39 a.m. about 115 miles west of Eureka, Calif., at a depth of 5 kilometers. The closest quake to shore came at 9:24 a.m. and had a magnitude of 5.0, according to the USGS. That one had a depth of 4 kilometers and was about 112 miles west of Ferndale.
"Historically this is a very active area, " said Keith Knudsen, deputy director of the Earthquake Science Center at the USGS. He said the quakes occurred at "the boundary between two plates that are moving relatively fast, past each other and we call this area the Mendocino Triple Junction, which implies there are three plates, and there are, but these particular quakes occurred in a boundary between two plates."
An overview of the San Andreas and Hayward faults.
Media: Martin do Nascimento
The USGS initially reported a third quake during the same hour with a 5.1 magnitude, but that turned out to be a duplicate report of the second, Knudsen said. He added that almost 150 people in the area reported light shaking.
The operators of the Victorian Inn in Ferndale said nobody on staff felt the shaking, but there was some talk around town about it.
More information on this earthquake is available on the USGS event page.
See the latest USGS quake alerts, report whether you felt earthquake activity and tour interactive fault maps in the earthquake section.
SFGATE's Amy Graff contributed to this story.
