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Old 12-08-2016, 02:35 PM   #1
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Default 6.5 Quake off CA -- Humboldt County - Dec. 8, 2016



USGS reports that a magnitude-6.5 earthquake hit off the coast of Humboldt County.

No tsunami warning has been issued. There have been two significant aftershocks that hit Thursday morning -- a 5.0 and a 4.9.

The quake was first reported as a magnitude-6.8 but was later downgraded.

6.5m #earthquake felt from Eugene, OR south to Santa Cruz, CA & east to #Sierra foothills. pic.twitter.com/xERW5UXoSW
— Mike Nicco (@MikeNiccoABC7) December 8, 2016



The quake was reported at 6:49 a.m. well north of the Bay Area, but prompted delays of 10 minutes systemwide on BART as trains ran at reduced speeds as a precaution.

People reported feeling the earthquake as far away as San Francisco and Santa Cruz. It reportedly hit right on the Mendocino fault line.

There are no immediate reports of damage or injuries.

http://abc7news.com/news/68-magnitud...ureka/1645721/




Might or might not bear watching for a spell. The area off the northern coast of CA is a fairly active seismic zone. It's smack dab in the Mendicino triple junction.

Quote:
The Mendocino Triple Junction (MTJ) is the point where the Gorda plate, the North American plate, and the Pacific plate meet, in the Pacific Ocean near Cape Mendocino in northern California. This triple junction is the location of a change in the broad plate motions which dominate the west coast of North America, linking convergence of the northern Cascadia subduction zone and translation of the southern San Andreas Fault system.[1] The Gorda plate is subducting, towards N50ºE, under the North American plate at 2.5 – 3 cm/yr, and is simultaneously converging obliquely against the Pacific plate at a rate of 5 cm/yr in the direction N115ºE. The accommodation of this plate configuration results in a transform boundary along the Mendocino Fracture Zone, and a divergent boundary at the Gorda Ridge.[2][3]

Due to the relative plate motions, the triple junction has been migrating northwards for the past 25–30 million years, and assuming rigid plates, the geometry requires that a void, called slab window, develop southeast of the MTJ.[4] At this point, removal of the subducting Gorda lithosphere from beneath North America causes asthenospheric upwelling.[3] This instigates different tectonic processes, which include surficial uplift, crustal deformation, intense seismic activity, high heat flow, and even the extrusion of volcanic rocks. This activity is centred on the current triple junction




https://en.wikipedia.org/wiki/Mendocino_Triple_Junction


http://www2.humboldt.edu/shakyground...uake_country1/
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Old 12-08-2016, 02:41 PM   #2
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A 6.5 is a respectable tremor. Hope we're not going to see any significant damage or injuries.
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Old 12-08-2016, 02:45 PM   #3
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Quote:
Originally Posted by A.T. Hagan View Post
A 6.5 is a respectable tremor. Hope we're not going to see any significant damage or injuries.
No damage or injuries being reported at this time.

Only posted the event because of its location and the history of the plates in the area.
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Old 12-08-2016, 10:06 PM   #4
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I'm from that area and most of my family still lives up there. My parents, who are about 12 miles from Ferndale, were not impressed. My Mom was surprised that it was that large. She estimated it to be about a 4.0. It was a gentle rolling earthquake, not one of the sharp, sudden ones. Of course, almost everyone was still in bed when it hit.
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