2480 CSZ PDF

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By comparing the tree rings of dead trees with those still living they could tell when the last of these great earthquakes struck the region. This was published in response to the Januray Gorda plate earthquake. Such an earthquake would have ruptured the earth along the entire length of the km mi -long fault of the Cascadia Subduction Zone and severe shaking could have lasted for 5 minutes or longer.

From the beginning the animation shows all coastlines covered by colored points. These tree snags were cz trees prior to the earthquake and remain to remind us of the earthquake hazards along subduction zones. On this evening, years ago, the Cascadia subduction css fault ruptured as a margin wide earthquake. This map shows where the czz are located.

YT link for the embedded video below. These are initially a blue color like the undisturbed ocean to indicate normal sea level, but as the tsunami waves reach them they will change color to 240 the height of the waves coming ashore, and often these values are higher than they were in the deeper waters offshore.

These cores contain submarine landslide deposits called turbidites. I here commemorate this birthday with some figures that are in two USGS open source professional papers. Here is a map of the Cascadia subduction zone, modified from Nelson et al. The first article sparked a national debate after it was read by millions using an estimate based upon the recorded time the website was being used.


We also can see how a subduction zone generates a tsunami. Before the earthquake, the ground is sufficiently above sea level that trees can grow without fear of being inundated with salt water. I include a 2840 link and embedded video and an mp4 22480 video and download […].

Pictures of CSX

Where there is also evidence for past CSZ tsunami, there are black dots. I present a summary about the CSZ tectonics on a th year commemoration page here. Viola Riebe, elder of the Hoh Indian Tribe, talks about an oral history of the Thunderbird and the whale — and how this most respected story is related to tsunami awareness.

Following the earthquake, tidal sediment is deposited above the tsunami cdz sediment.

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That much motion over such a large area requires a very large earthquake to explain 2840 as large as 9. The Pacific Tsunami Warning Center PTWC can create an animation of a historical tsunami like this one using the same too that they use for determining tsunami hazard in real time for any tsunami css The reference list is extensive and this is but a tiny snapshot of what we have learned about Cascadia subduction zone earthquakes. Here is a version of the CSZ cross section alone Plafker, This debate has resulted in a renewed interest in becoming more resilient.

New post about The M9 Project and 3-D computer fsz on our blog! Here is a photo I took in Alaska, where there was a subduction zone earthquake in The Blanco 2408 zone is also an active transform plate boundary. This is modified from Goldfinger et al.

The salt water kills the trees and other plants. Just before midnight on January 27, a tsunami struck the coasts of Japan without warning since no one in Japan felt the earthquake that must have caused it. They learned that this geologically active region, the Cascadia Subduction Zone, not only hosts erupting volcanoes but also produces megathrust earthquakes capable of generating devastating, ocean-crossing tsunamis.

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Here is a graphic showing the sediment-stratigraphic evidence of earthquakes in Cascadia. This correlation figure demonstrates how well these turbidites have been correlated. This animation shows these values through the simulated motion of the waves and as they race around the globe cszz can also see the distance between successive wave crests wavelength as well as their height half-amplitude indicated by their color.

The trees all died in the winter of when the coasts of northern California, Oregon, and Washington suddenly dropped m ft.

I summarized the regional tectonics of the Cascadia subduction zone 24880 here. The Atwater et al. If there is a source of sediment to be transported by a tsunami, it will come along for the ride and possibly be deposited upon the pre-earthquake ground surface. Patton “earthjay” is currently living in Arcata, CA.

He was most recently teaching classes at Humboldt State University, Dept. Learn how your comment data is processed. Your email address will not be published. Leave a Reply Cancel reply Your email address ccsz not be published. This figure, also from Wang et al.


Now plants that can survive in this environment start growing again. Some submarine paleoseismology core sites are also shown as grey dots. Brian Atwater and his colleagues have updated the Orphan Tsunami and produced a second edition available here for download and here for hard copy purchase I have a hard copy. This shows how a tsunami deposit may be preserved in the sediment stratigraphy following a subduction zone earthquake, like in Cascadia.

There are 3 panels on the left, showing times of 1 prior to earthquake, 2 several years following the earthquake, and 3 centuries after the earthquake. Sometimes plants that were growing prior to the earthquake get entombed within the tsunami deposit.