Cascadia Subduction Zone Gets Serious

23 12 2019

LINK –  https://youtu.be/l_Be3PaKHcw

USGS live map

 

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56 responses

23 12 2019
flyingcuttlefish

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23 12 2019
flyingcuttlefish

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23 12 2019
flyingcuttlefish

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24 12 2019
Keith Mandeville

Diamond say most of the Cascadia earthquakes occurred during a grand solar minimum, which the sun is in right now.
https://ibb.co/stWRCyy

Watch “4 Quakes Strike In 4 Hours Off Vancouver Island, No Damage or Injuries – The Next Cascadia Megaquake” on You Tube.

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24 12 2019
flyingcuttlefish

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25 12 2019
Keith Mandeville

Magnitude 6.3
Region VANCOUVER ISLAND, CANADA REGION
Date time 2019-12-25 03:36:01.4 UTC
Location 50.56 N ; 130.00 W
Depth 2 km
https://ibb.co/ZgYtnbk

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25 12 2019
Keith Mandeville

The Pacific Tsunami Warning Center does not have a tsunami alert for the 2km deep quake that just occurred off Vancouver Island.
https://ibb.co/hXYr3tN

https://ptwc.weather.gov/

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25 12 2019
flyingcuttlefish

those guys never do …

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25 12 2019
flyingcuttlefish

very shallow AGAIN!

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25 12 2019
Keith Mandeville

USGS map of area earthquakes.
https://ibb.co/fSSGwF4

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25 12 2019
flyingcuttlefish

glad I did that post or I would be busy today …

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25 12 2019
Keith Mandeville

Earthquakes Canada – Western Canada

Vancouver Island sequence of earthquakes:
Mag=6.2 on 24 Dec 19:36 PST.
Mag=4.8 on 23 Dec 15:38 PST.
Mag=6.0 on 23 Dec 12:56 PST.
Mag=5.8 on 23 Dec 11:49 PST.
Mag=5.6 on 23 Dec 11:13 PST.
Mag=5.1 on 23 Dec 8:44 PST.

Earthquakes last 30 days.
https://ibb.co/LJ4VSnD

https://earthquakescanada.nrcan.gc.ca/index-en.php?tpl_region=west

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25 12 2019
flyingcuttlefish

gawdddd! 🙀

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26 12 2019
Keith Mandeville

Magnitude 4.8
Region VANCOUVER ISLAND, CANADA REGION
Date time 2019-12-25 20:38:52.8 UTC
Location 50.85 N ; 130.26 W
Depth 10 km
https://ibb.co/X2P7cYB

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26 12 2019
flyingcuttlefish

wow! Lots of traffic on this too …

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26 12 2019
flyingcuttlefish

5.8 lower down off Chile … but looks like connected fault –
https://earthquake.usgs.gov/earthquakes/eventpage/us70006r1g/executive

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26 12 2019
flyingcuttlefish

Nine earthquakes in less than 24 hours hit California on Christmas eve, early morning
https://www.sacbee.com/news/california/article238708288.html#storylink=topdigest_latest

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26 12 2019
flyingcuttlefish

4.8 quake offshore west from Port Hardy, Canada
https://earthquake.usgs.gov/earthquakes/eventpage/us70006r1m/executive

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26 12 2019
flyingcuttlefish
26 12 2019
Keith Mandeville

Yea, I see a large amount of tremors on the Oregon, northern California area where the Juan de Fuca fault points towards Oregon.

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26 12 2019
Keith Mandeville

Here’s the proof.
https://ibb.co/6mGG8Rn

Tremor Map | Pacific Northwest Seismic Network.
https://pnsn.org/tremor

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26 12 2019
Keith Mandeville

That’s for yesterday only.

Dates: 2019-12-25 – 2019-12-25
Total: 340 epicenters

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26 12 2019
flyingcuttlefish

yeah, I see that fault on the map and forget the name of it … that big one down by Chile was on that line…

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26 12 2019
flyingcuttlefish

Very Unusual Seismic Activity On The West Coast Has Some Experts Extremely Concerned About What Could Happen
http://themostimportantnews.com/archives/very-unusual-seismic-activity-on-the-west-coast-has-some-experts-extremely-concerned-about-what-could-happen

” . . . but certainly a lot of really weird things have been happening in the U.S. lately.
Overall, there have been more than 1,200 earthquakes in the United States over the past week, and the majority of those quakes have happened in the state of California.
Prior to the earthquake swarm that we witnessed on Christmas Eve and Christmas Day, a series of moderate quakes rattled the Ridgecrest area on Thursday and Friday…”

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26 12 2019
26 12 2019
flyingcuttlefish

News stories I check downplay the quakes as a danger (re: Cascadia Subduct’n Zone) and prattle on about be sure you have a flashlight etc.
If there is a major event on the west coast most residents will have no idea in advance of the danger.

typical story –
Six strong earthquakes rumble through British Columbia
https://lmtribune.com/northwest/six-strong-earthquakes-rumble-through-british-columbia/article_b207dc7f-258c-5d8a-a0c7-7b0855757f82.html

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26 12 2019
flyingcuttlefish

(2018) Cascadia Subduction Zone Earthquake Study Is Bad News For Portland
https://prepforthat.com/cascadia-subduction-zone-portland/

2015 New Yorker article –
The Really Big One
An earthquake will destroy a sizable portion of the coastal Northwest. The question is when.
https://www.newyorker.com/magazine/2015/07/20/the-really-big-one

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26 12 2019
flyingcuttlefish

from the New Yorker article –

“Take your hands and hold them palms down, middle fingertips touching. Your right hand represents the North American tectonic plate, which bears on its back, among other things, our entire continent, from One World Trade Center to the Space Needle, in Seattle. Your left hand represents an oceanic plate called Juan de Fuca, ninety thousand square miles in size. The place where they meet is the Cascadia subduction zone. Now slide your left hand under your right one. That is what the Juan de Fuca plate is doing: slipping steadily beneath North America. When you try it, your right hand will slide up your left arm, as if you were pushing up your sleeve. That is what North America is not doing. It is stuck, wedged tight against the surface of the other plate.

Without moving your hands, curl your right knuckles up, so that they point toward the ceiling. Under pressure from Juan de Fuca, the stuck edge of North America is bulging upward and compressing eastward, at the rate of, respectively, three to four millimetres and thirty to forty millimetres a year. It can do so for quite some time, because, as continent stuff goes, it is young, made of rock that is still relatively elastic. (Rocks, like us, get stiffer as they age.) But it cannot do so indefinitely. There is a backstop—the craton, that ancient unbudgeable mass at the center of the continent—and, sooner or later, North America will rebound like a spring. If, on that occasion, only the southern part of the Cascadia subduction zone gives way—your first two fingers, say—the magnitude of the resulting quake will be somewhere between 8.0 and 8.6. That’s the big one. If the entire zone gives way at once, an event that seismologists call a full-margin rupture, the magnitude will be somewhere between 8.7 and 9.2. That’s the very big one.”

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26 12 2019
flyingcuttlefish

The New Yorker article says there is NO tsunami warning system for the Pacific NW.
This group, proposing one, says they still have not put one in.
http://www.cascadiaoffshore.org/index.html

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26 12 2019
flyingcuttlefish

2012 – Oregon State U. –
13-year Cascadia study complete – and earthquake risk looms large
https://today.oregonstate.edu/archives/2012/jul/13-year-cascadia-study-complete-%E2%80%93-and-earthquake-risk-looms-large

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26 12 2019
flyingcuttlefish

2013 plan by Oregon on what do when the thing hits –

Click to access 01_ORP_Cascadia.pdf

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26 12 2019
flyingcuttlefish

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26 12 2019
flyingcuttlefish

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27 12 2019
Keith Mandeville

The number of tremors is still high for the southwest Portland and northwest California areas.

Dates: 2019-12-26 – 2019-12-26
Total: 286 epicenters
https://ibb.co/JpMZrn4

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27 12 2019
flyingcuttlefish

Portland doesn’t fare so well in those simulation animations.
Now I read eq activity can set off volcanoes so P.R. makes me nervous. What would happen with Mt. Ranier if the west coast plate fell off?

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27 12 2019
Keith Mandeville

Expert’s interests have been peeked.

Dates: 2019-12-27 – 2019-12-27
Total: 299 epicenters

Colored by magnitude.
https://ibb.co/7Kvt7mv

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28 12 2019
flyingcuttlefish

‼‼‼‼

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28 12 2019
flyingcuttlefish

CA-NEV quake map –
https://scedc.caltech.edu/recent/index.html

I think that cluster is at China Lake

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28 12 2019
flyingcuttlefish

… it IS China Lake …. swarm this week (not today)
https://scedc.caltech.edu/recent/Maps/118-36.html

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28 12 2019
28 12 2019
Keith Mandeville

M3.0 earthquake occurred on the Juan de Fuca fault’s cleft segment that points towards Oregon. They really haven’t pinpointed a depth because a 10km autogenerated depth has been chosen. Or maybe someone doesn’t want the public to know the actual depth because more revealing evidence could be calculated.

Magnitude 3.0
Region OFF COAST OF OREGON
Date time 2019-12-28 15:36:38.6 UTC
Location 43.32 N ; 127.01 W
Depth 10 km

https://ibb.co/0yNtgC7
https://ibb.co/xKZf6sY
https://ibb.co/W5GMNRh

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28 12 2019
flyingcuttlefish

this seems very ominous….

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28 12 2019
Keith Mandeville

Tried the collage effect for displaying the 3 images of the same event.
https://ibb.co/ctJXCCj

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28 12 2019
flyingcuttlefish

that worked well!

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29 12 2019
flyingcuttlefish

Oregon & P.R. both bouncing ….

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2 01 2020
flyingcuttlefish

4.1 quake (shallow) about 100 miles from Bakerfield CA
https://www.tsunami.gov/events/PAAQ/2020/01/02/q3h5pn/1/WEAK53/WEAK53.txt

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8 01 2020
flyingcuttlefish
9 01 2020
flyingcuttlefish

There’s a big quake swarm in Russia across from Alaska –
6.3 quake –
https://earthquake.usgs.gov/earthquakes/eventpage/us70006wuf/executive

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21 01 2020
flyingcuttlefish

4.0 M quake up at the top of the zone ….
https://earthquake.usgs.gov/earthquakes/eventpage/us60007bws/executive

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24 01 2020
8 02 2020
14 02 2020
19 02 2020
2 03 2020
2 03 2020
flyingcuttlefish

some really big quakes off Alaska’s western islands at the same time….

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4 03 2020
flyingcuttlefish

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