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Earthquakes, Juan de Fuca, Pacific NW
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PostPosted: Wed Jun 03, 2015 9:32 am    Post subject:  Reply with quote

Recent Earthquakes a Reminder That Washington Could Be Next
May 8, 2010
By Christopher Dunagan Kitsap Sun

A bright-red splotch on a map of earthquake hazards marks the Kitsap Peninsula as one of the hottest danger zones in the United States.

The more seismologists learn about earthquake hazards in Western Washington, the more they seem to emphasize the presence of a time bomb ticking beneath our feet.
Now more than ever, residents are being urged to understand the risks of earthquakes and to prepare for an unprecedented level of shaking.

Such concerns are punctuated by recent devastating earthquakes in Haiti, China and Chile — with the South American quake holding special significance for the Northwest.

The red splotch on the Kitsap Peninsula was added to the hazard map two years ago, as researchers continued to piece together a seismic puzzle called the Seattle fault.
This dangerous fault has been found to be responsible for lifting up the south end of Bainbridge Island by 21 feet some 1,100 years ago.
The fault stretches across Central Puget Sound and includes Bellevue, Seattle, Bainbridge Island, Bremerton and Port Orchard.

Meanwhile, a bright-red stripe parallels the Washington coast, touching the southwest corner of the Kitsap Peninsula.
This high-hazard zone is where maximum ground acceleration is predicted, reflecting the danger of a subduction quake that researchers now believe could reach magnitude 9.

Subduction quakes result from sudden slippage where two tectonic plates are rubbing against each other.
Off the Washington coast, for example, the incoming Juan de Fuca plate slides slowly under the North American plate.
In some locations, the plates get “stuck” until they break loose in an earthquake.

Lessons From Chile

In February, a magnitude-8.8 subduction quake struck off the coast of Chile, killing more than 500 people and damaging more than 200,000 homes.

Information gathered from the Chilean earthquake will be used to fine-tune predictions about what would happen from a subduction earthquake in Washington state, according to Art Frankel of the U.S. Geological Survey.

“The Chile earthquake will be important because we have never had a subduction earthquake of that magnitude with good measurements this close in,” Frankel said. “This could change things.”

Frankel and other seismologists will use information from instruments throughout South America to tell a story about anticipated ground motion during a subduction earthquake.
Meanwhile, structural engineers will study damaged and intact buildings to predict potential damage in Western Washington and to improve building standards.

The earthquake in Chile showed that structures built to modern seismic codes, such as those adopted for Washington, are able to withstand great earthquakes.
But older buildings, often made of unreinforced concrete and brick, are vulnerable to collapse in a strong earthquake unless building owners brace the walls.

One of the tragedies in Chile was the large number of deaths attributed to a tsunami triggered by the earthquake.
Official flood maps successfully predicted where high water would occur.
But some people — especially tourists — were unaware of the hazard; some were waiting for an official warning or visible sign of danger;
and others left but came back to the waterfront before the largest waves arrived, according to a survey team from California’s Humboldt State University.

Subduction quakes in the Northwest are relatively rare, happening about every 550 years.
But that does not help in predicting the next big one, because intervals may be as close together as 200 years or as far apart as 1,000 years.
The last subduction quake was in 1700.

Nisqually Earthquake

The earthquake seared into the memory of many Western Washington residents is the 2001 Nisqually quake, a magnitude 6.8 that originated beneath the Olympia area on Feb 28.

For Cristie Grogger, who lived in Port Orchard at the time, the sound was like a garbage truck roaring down the street.

“It sounded like the trash man,” Grogger said after the earthquake. “But he was coming right through the middle of our house!”

It was just a fleeting thought, as the sickening, undulating motion threatened to tear the house apart, she said. Her instinct was to protect her 12-day-old baby.

“I remember thinking, ‘Please God, I just had this baby. Let me experience this child. Don’t end it now.’ I was really terrified.”

Damage from the earthquake, which shook the entire Puget Sound region, was later estimated at more than $1 billion.

According to records compiled by the Federal Emergency Management Agency, 2,666 Kitsap County residents applied for federal disaster assistance.
About $3.3 million was provided in housing assistance, with another $4.8 million in low-interest loans.

Only four counties received more housing assistance: King with $19.9 million, Pierce with $11.9 million, Thurston with $5.9 million, and Grays Harbor with $3.7 million.

The totals do not include financial aid to public agencies. Puget Sound Naval Shipyard alone received $8.2 million to repair several aging buildings damaged in the quake.

Amazingly, only one death — a heart attack victim — was attributed to the quake.

At 32 miles deep, the Nisqually quake is considered a “deep” earthquake. In the past 100 years, most of Washington’s largest earthquakes are classified as deep, or greater than 15 miles.
They include the 7.1-magnitude quake in 1949 north of Olympia, which killed eight people, and the 6.5-magnitude quake in 1965 near Vashon Island, which killed seven people.
Both caused extensive damage throughout the region and were felt as far away as western Montana.

Based on the history of deep earthquakes, seismologists say there is an 84 percent chance that we will have another deep earthquake of magnitude 6.5 or greater within the next 50 years.

Local residents may remember the 1997 earthquake of magnitude 4.9, which occurred at the south end of Bainbridge Island and was linked to a branch of the Seattle fault.

Photo: Earthquake researchers dug a trench at the south end of Bainbridge Island in 2003 to find evidence of ancient earthquakes along the Seattle fault.
Here, U.S. Rep. Jay Inslee, D-Bainbridge Island, questions seismologist Brian Sherrod, foreground, about how 15 million-year-old bedrock came to lie next to 15,000-year-old earth.
In the background are seismologist Craig Weaver and federal geologist Elizabeth Barnett, both part of a team studying the ancient quakes.

Damage was relatively minor. Besides many falling items and cracks in walls and ceilings, a mobile home fell off its foundation in Silverdale.
The quake provided a wake-up call for local officials, who had just returned to Kitsap County from a weeklong earthquake-training exercise in Maryland.

Small shallow earthquakes occur frequently with little damage throughout the Puget Sound region,
but it was a shallow earthquake 1,100 years ago that suddenly raised the south end of Bainbridge Island by 21 feet.
A repeat of that kind of earthquake could be as devastating as a subduction quake for Bremerton, Port Orchard and Bainbridge Island.

A major earthquake on the Seattle fault would create a tsunami that could inundate many shoreline areas on the Kitsap Peninsula.
On the Bremerton waterfront, for example, strong currents could break the Turner Joy from its moorings and push the ship into the Bremerton Boardwalk,
according to a 2005 study conducted for the Kitsap County Department of Emergency Management. A big wave could rise over the boardwalk and affect other buildings close to shore.

Computer models also show a substantial wave run-up in Sinclair Inlet to Gorst, where a “funnel” effect could cause water to rush rapidly into businesses at the head of the bay.

Kitsap County Department of Emergency Management writes plans, conducts training and schedules drills to prepare for disasters — including floods, windstorms and most of all, earthquakes.

A 2008 vulnerability assessment describes the kind of problems that can be expected from an earthquake, including damage to buildings, roads, bridges and utilities.

Travel, including trips to the store, may be difficult following an earthquake, and some stores may be unable to reopen.
That’s why Kitsap County residents are urged to maintain supplies at home to live on their own for at least three days, assuming no power, water or other utilities.

Immediately after an earthquake, most people will want to make sure their family members are safe, said Mike Gordon, operations manager for Kitsap County DEM.
Because local phone lines may be overloaded, it may help to call an out-of-town relative or friend via long-distance lines.
Family members should agree in advance about who to call.

“What I think about after an earthquake is the neighborhood,” Gordon said. “How can I help other people? If you make sure you are prepared yourself, then you can look to help others.”

Emergency managers are developing an inventory of “vulnerable” populations, such as older people who depend on caregivers and people who live in group homes, said Susan May of Kitsap DEM.

Gordon said an update of the Kitsap County Comprehensive Emergency Management Plan has just been completed and will soon go to the Kitsap County commissioners for approval.

The agency helps neighborhoods and businesses get prepared for an earthquake. Other training ranges from operating shelters to working in the county’s emergency operations center.
A training course on Friday is designed to show building managers and construction professionals how to identify hazards visually.

Meanwhile, a wide-ranging earthquake drill scheduled for September will involve 40 public agencies, and businesses are invited to take part.

“We’ve had a planning team working on this since January,” Gordon said. “We are incorporating several incident sites to put a strain on our resources. We want to test our ability to respond.”

Scripps Lighthouse

FULL CREDIT to Stan Deyo

Janine Morris, right, and her daughter, Erin, 12, explored a section of Highway 302 near Victor in North Mason County that was closed for repair after the 6.8-magnitude Nisqually earthquake struck in February 2001. (Steve Zugschwerdt | Kitsap Sun file photo)

Last edited by CJ on Sat Jan 07, 2017 4:18 am; edited 1 time in total
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PostPosted: Wed Jun 03, 2015 10:24 am    Post subject: Reply with quote

I began seeing quakes and volcanoes offshore Oregon and Washington state, but not many mention the Juan de Fuca or Mendocino, so I am doing comparisons.
My info is based on dutchsinse.com notes, Stan Deyo.com, a friends vision of a coming PNW tsunami, and my own notes and research.
I dont remember Ed's PNW tsunami vision so will need to email him.
I dont know where this will go, but this is starter information.

Juan de Fuca plate
June 3, 2015 -  The Juan de Fuca plate is offshore Washington-Oregon PNW USA.
It has been having a lot of earthquakes during 2015.

WHATs goin on off OREGON!?  (kirotv)
7 earthquakes hit off Oregon coast in less than a day
The Mendocino Fracture Zone between the Gorda Plate and Pacific Plate
Mendocino is on the bottom of the Juan de Fuca plate

Axial Seamount erupting undersea volcano off Oregon May 2015
Axial is just above the elbow of the Juan de Fuca plate

Juan de Fuca / Mendocino images

Juan de Fuca plate


CASCADES * Mt Hood, Rainier, Helens

7.7 quake hit B.C. Canada Oct. 27, 2012


Ed Waldon Juan de Fuca vision - page 6


Last edited by CJ on Tue Jan 19, 2016 3:56 am; edited 1 time in total
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PostPosted: Thu Jun 04, 2015 6:00 am    Post subject: Reply with quote

4.0 quake off Oregon coast
June 3, 2015
-  Another noteworthy earthquake has occurred off the shores of Oregon.
The swarm of earthquakes off the shores of Oregon are at the undersea “Cleft volcanic complex”
at the South tip of the Juan De Fuca fault zone, 100 miles South of the erupting Axial Seamount volcano.
There are new lava flows occurring at the Axial seamount .

With this NEW swarm of earthquakes occurring about 100 miles South of the Axial Volcano.

California, Arizona, and Utah are experiencing other dormant volcanoes earthquake activity.  There appears to be a 1-2 day window between the dormant volcanoes moving, and the larger event off the West coast.

Mag 4.0 earthquake off the coast of Oregon
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PostPosted: Tue Jan 19, 2016 4:07 am    Post subject: Reply with quote

PNW Earthquake Warning
Jan 19, 2016  -  US West Coast Earthquake Warning
, Cascadia Subduction Zone.
An ocean data buoy alert off the west coast of Oregon. This is where a magnitude 9.0 earthquake hit in 1700.

The land beneath the ocean suddenly sunk.
2.5 seconds later height had dropped 4 inchs.
The earth sunk, and continued to sink 4 feet!
The Juan de Fuca Plate has moved eastward beneath the North American Plate.
This usually causes a bad earthquake.
This may trigger Mount Hood Volcano to blow.
Earthquake-Tsunami inland for 10 miles, past Interstate 5
Goodbye Los Angeles, that'd fix your gas leak!

Ed Waldon visions
Ed has had a vision of a massive tsunami along the west coast.
Others have envisioned one on east coast.

7.7 quake hit B.C. Canada Oct. 27, 2012

OREGON earthquake, weather news
You might want to scan these pages


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PostPosted: Wed Apr 06, 2016 6:25 am    Post subject: Reply with quote

3.5 earthquake Washington
April  6, 2016
-  EMSC calls it Strait of Juan de fuca, S of Vancouver
Depth 52 km
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PostPosted: Sat May 21, 2016 5:50 am    Post subject: Reply with quote

4.9 shallow earthquake WNW of Bandon, Oregon
May 20, 2016  -  Right on the Juan de Fuca plate
A major quake-tsunami will occur again

Oregon struck by M5.0 earthquake
by Michael Janitch - It has been several weeks since we've seen this size earthquake occur off the West coast of the United States.
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PostPosted: Sat Jan 07, 2017 4:05 am    Post subject: Reply with quote

5.7 earthquake Vancouver Island, Canada
Jan 7, 2017  
-  Quake on top end of the Juan de Fuca plate
This is the largest quake here in the past 12 months.  It is the 4th and the strongest quake I have seen in the past 24 hours - is a bigger one coming?

Vancouver Island
5.1 magnitude earthquake hits off west coast of Vancouver Island
No tsunami warning or shaking felt after shallow earthquake under the Pacific Ocean
The earthquake took place at a depth of 10 kilometres. No shaking has been reported.
According to CBC seismologist Johanna Wagstaffe the source of the quake was the oceanic plate of the Juan de Fuca subduction zone where earthquakes are common.

Pacific NW quake swarm
Jan 6, 2017
dutchsinse -  Dutch says a HUGE volcano is erupting, so much it created a new island up in Alaska, and that caused this Vancouver quake swarm.
Mount Rainier and Mount Hood had deep quakes earlier this month.
The Vancouver swarm is near the END of this video.

Dutch Sinse quake reports

Vancouver BC Canada quakes
In 2012 a 7.7 quake hit BC Canada

Juan de Fuca plate

Image of Juan de Fuca

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PostPosted: Sun Jan 08, 2017 12:24 am    Post subject: Reply with quote

Thank you again for keeping up with this.

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