November 8, 2012, Submitted by: Ken (Modern Survival Blog)
Earthquakes trigger more earthquakes.
UPDATE: Magnitude 6.3 NOV-8 Earthquake At Cascadia Raises More Concern
Scroll down for more…
At the Seismology Lab at the University of Washington, there is concern that the 7.7 magnitude earthquake that occurred on the British Columbia coast over the weekend could affect the Pacific Northwest including Washington, Oregon, and northern California.
“We need to watch the whole region with extra care,” said a seismologist there.
The magnitude 7.7 was a big earthquake, considered one of the most significant along the northwest coast in 60 years.
Reported by NWCN.com in Seattle, scientists also looked to see if the quake affected volcanoes in Washington, and will remain on alert for at least several more weeks. So far, everything is quiet…
The problem is that the West Coast, from Alaska to northern California, is under tremendous geologic pressure as it’s forced up against the basin that forms the Pacific Ocean.
Release the pressure in a major way along one fault, and it can then add to the pressure on another fault. More than 100 aftershocks were recorded following the 7.7, including one of them more than 100 miles south of the quake’s epicenter, thought to be on the Cascadia Subduction zone.
The subduction zone threatens a much larger quake…
a magnitude 9…
from the northern tip of Vancouver Island to Cape Mendicino California.
Such an earthquake would be devastatingly catastrophic, particularly to Seattle, Portland, and all of the cities and towns that run up and down the west coast, even through mid California.
I’m posting this as an alert that something ‘could’ happen as a result of this recent aftershock earthquake, which is well south of the main quake on the Cascadia Subduction zone… this looks potentially ominous.
If you live in or near those regions, examine your existing supplies, food, water, bug-out capabilities. Make a plan. Be ready. Just in case…
UPDATE: It is now being reported that the centuries old and famous “Haida Gwaii” Hot Springs in the region of the 7.7 earthquake… HAS DRIED UP AND GONE COLD.
A Parks Canada inspection party set out to investigate and stepped ashore to find that the island’s three main hot spring pools, which once bubbled with water as warm as 77 Celsius, were bone dry. “Not even a small puddle,” Surrounding rocks, once warm to the touch, were cold.
(This is obviously IMO related to the recent B.C. earthquake, and further indicates the great unseen changes that have taken place as a result.)
NOV-8, 6.3 Quake at Cascadia Subduction Zone Raises More Concern
Since the large magnitude 7.7 earthquake of OCT-28, not only have hundreds of aftershocks occurred in the immediate vicinity, but other curious earthquakes have been triggered further south, within the Cascadia subduction zone. On NOV-8 an especially large earthquake shook that region, further indicating that stresses have transferred into that region. Why is this significant? Because the Cascadia fault is EXTREMELY DANGEROUS for the entire Pacific Northwest.
The Cascadia subduction zone (Cascadia fault) is a type of tectonic plate boundary that stretches from northern Vancouver Island to northern California. It is a very long sloping fault that separates the ‘Juan de Fuca’ and North America plates.
Ocean floor is sinking below the continental plate offshore of Washington and Oregon. The North American Plate is moving southwest, riding over the top of the oceanic plate. The Cascadia Subduction Zone is where the two plates meet. Unlike other faults that slide along side each other, this one is particularly dangerous because one plate rides over the top of another.
To make matters worse, the Cascadia fault intersects and transitions with other faults at it’s north and south boundaries, including the infamous San Andreas fault which runs down the length of California. Studies of past earthquakes on both the northern San Andreas Fault and the southern Cascadia subduction zone indicate that quakes on the Cascadia subduction zone may have triggered most of the major quakes on the northern San Andreas during at least the past 3,000 years, with the exception being the great 1906 San Francisco earthquake.
The next rupture of the Cascadia Subduction Zone is anticipated to be capable of causing a magnitude 9+ earthquake and widespread destruction throughout the Pacific Northwest. And in fact, evidence suggests that a major Cascadia earthquake will likely rupture the San Andreas fault as it splits down into California, the combined effects of which would be more than devastating.
Geologists and civil engineers have broadly determined that the Pacific Northwest region is not well prepared for such a colossal earthquake. The tsunami produced may reach heights of approximately 100 ft. The earthquake is expected to be similar to the 2011 Tōhoku earthquake and tsunami, as the rupture is expected to be as long as the 2004 Indian Ocean earthquake and tsunami.
Left: Cascadia Subduction Zone
Right: Earthquakes since the OCT-28 quake (until this update)
Note the significant recent quakes south of the initial quake (the top cluster)
UPDATE NOV-10, Aftershocks creeping towards Cascadia fault and Vancouver Island…
This could all be inconsequential, while I’m simply pointing out observations.
Days after the remote B.C. archipelago of Haida Gwaii emerged virtually unscathed from Canada’s second-strongest earthquake, locals discovered that the shifting earth had mysteriously switched off a centuries-old hot spring considered sacred by the Haida.
“It’s a very culturally significant site — even today Haida people would go down to take advantage of healing properties of the springs,” said Ernie Gladstone, a field unit superintendent for Gwaii Haanas National Park, of which Hot Spring Island is a part.
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