Geology News: Cascadia Subduction Zone Ready to Let Go


Alex Wierbinski's picture

By Alex Wierbinski - Posted on 20 November 2017

 

 

Terrestial Geology

Cascadia Subduction Zone Ready to Let Go

Research Locates Its Most Powerfull Potential

Seafloor sediments appear to enhance Earthquake and Tsunami danger in Pacific Northwest,
UNIVERSITY OF TEXAS AT AUSTIN, November 20, 2017.


This research locates areas subject to greater and lesser potential tidal wave threats by determining sediment compaction levels.
During a major eathtquake the sediments compacted to, between, and above the eathquake-motivated moving plate transfers its force into the surrounding water very effectively, with the potential to create vast tidal waves, while uncompacted sediments dissapate more of the earthquake's force into the surrounding water.

North Oregon and Washingtion display dangerously compacted sediments, Central Oregon not so much.

Nonetheless, the whole Northwestern US coastal region is subject to a tremendous earthquake and tidal wave catastrophe from the Cascadia Subduction Zone every 200 to 530 years, or so. In 2017 we are 317 years from the last event.  That puts us 35% of the way across the 350 year-long window of Cascadia's Danger Zone event-timing.

We'e steadily moving deeper into the hot zone.

I have long been an admirer of the California and NW US coastal backpacking experience. Backpacking Point Reyes and Lost Coast since a child, pushing explorations up through Oregon & Washington, up to the unparalled beauty of the Olympics.

Among other changes, moving from the Sierra to the Coast is that our risk profile changes from that of the Sierra, here on the coast including very big earthquakes, big storms fresh off the North Pacific, and the big ticks living in the moisture of the temperate forests and moist coastal grasslands. Now we can add some amazingly big threats from the sea and sea-floor. 

Here's my advice: As most backpacking along along the Northern California Coast involves hiking up, over, and back down the endless series of ridges bracketing the creeks & rivers draining into the sea, we'll stay up on the ridge anytime we notice the ocean's water receeding, and especially stay up high until we can check the ocean's status after feeling an earthquake.

If we are low, and we feel a substantial earthquake, say we're camped in the forest just above the fine beach where a coastal river drains across it into the North Pacific, we might want to climb the ridge at our backs to better observe what happens next, if anything. We can sit up there on the ridge and estimate the location of the quake, then calculate the speed of any potential tidal waves, and try to figure out how long we should sit up there before heading back to camp. Better Safe than Sorry! 

Some of the "Engines of Life" that create our physical reality can also abruptly take our lives away. Every good "creation process," every Engine of Life, destroys something as it creates more energy out of that destruction.

 

What Would That be Like?
If the Whole Subduction Zone Uncorks?

The Giant, Underestimated Earthquake Threat to North America,
Discover, March 3, 2012.

 

Later Geo News

Is Cascadia Subduction Zone Feeding the Yellowstone Supervolcano?

 

 

Geology News

 

 

 

November 2017 High Sierra General News

 

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