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Your email address will not be published. Here is a map of the Cascadia subduction zone, modified from Nelson et al.
The Pacific Tsunami Warning Center PTWC can create an animation of a 248 tsunami csa this one using the same too that they use for determining tsunami hazard in real time for any tsunami today: 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 is the timeline of prehistoric earthquakes as preserved in sediment stratigraphy in Grays Harbor and Willapa Bay, Washington.
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. 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.
The Goldfinger et al. Here is an animation produced by the folks at Cal Tech following the Sumatra-Andaman subduction zone earthquake. 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. Sites where evidence of past earthquakes paleoseismology are denoted by white dots.
This shows how the CSZ is deforming vertically today Wang et al. Today is the th anniversary of the Cascadia earthquake of I present a summary about the CSZ tectonics on a th year commemoration page here.
Sometimes plants that were growing prior to the earthquake get entombed cssz the tsunami deposit.
Back to top Proudly powered by WordPress. Such an earthquake would have ruptured the earth along the entire length 2408 the km mi -long fault of the Cascadia Subduction Zone and severe shaking could have lasted for 5 minutes or longer.
Before the earthquake, the ground is sufficiently above sea level that trees can grow without fear of being inundated with salt water. This correlation figure demonstrates how well these turbidites have been correlated. This debate has resulted in a renewed interest in becoming more resilient.
I have several posts about that earthquake here and here. From the beginning the animation shows all coastlines covered by colored points.
Here is a photo I took in Alaska, where there was a subduction zone earthquake in A 6, year earthquake history in the region of the 22480 Earthquake Paper 2: This map shows the various possible prehistoric earthquake rupture regions patches for the past 10, years.
These paleoseismology sites are labeled e.
These tree snags were living trees prior to the earthquake and remain to remind us of the earthquake hazards along subduction zones. This figure shows how a subduction zone deforms between interseismic and during coseismic earthquakes. Viola Riebe, elder of the Hoh Indian Tribe, talks about an oral history of dsz Thunderbird and the whale — and how this most czz story is related to tsunami awareness.
Following the earthquake, tidal sediment is deposited above the tsunami transported sediment. Here is a map from Rollins and Stein, showing their interpretations of different historic earthquakes in the region. The two main spreading ridges are not labeled, but the northern one is the Juan de Fuca ridge where oceanic crust is formed for the Juan de Fuca plate and the southern one is the Gorda rise where the oceanic crust is formed for the Gorda plate.
Where there is also evidence for past CSZ tsunami, there are black dots. In commemoration of the last known Cascadia subduction zone earthquake, I present a summary background material here.
I here commemorate this birthday with some figures that are in two USGS open source professional papers. The faults are from Chaytor et al.