Discover Top Posts Tagged with #mega tsunami

Scishow: Megatsunamis: World's Biggest Wave:

Megatsunamis are not only much larger than your average tsunami, they also form under different conditions. Good news: they're extremely rare. Bad news: they might not be for long.

Hosted by: Hank Green

#Science #Mega tsunami #tsunami #geology #oceans #stem

Watery Wraith - 🌊

NO, THIS IS NOT A JOKE POST NOR AM I TROLLING

BUT I WILL SAY - xD

FUCK HUMANITY !!!

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IT’S GOOD TO SEE ALL YOU UNHOLY ROTTEN FUCEKR’S DIE OFF

AND EVEYTHING I SAID UNDER THSI POST IS NOT BULLSHIT

SOPEE IT IS DUBBLE GOOD, YOU GET TO AWAKEN AFTER DEAD AND ... !!! WE GET ARE FUCKING PLANET BACK !!!

#Nwo #Agenda 21 #Cull the Entier Herd #Tsunami #Mega Tsunami #Watery Wraith

A mega tsunami or not?

For decades, geoscientists have recognized the potential for ocean islands to trigger tsunami waves by large avalanches. There are large avalanche deposits off the coast of islands in both the Atlantic and Pacific and even scarps on the edge of islands marking breakaway points. If some of these islands did suddenly collapse, they could trigger tsunami waves up to hundreds of meters high on those islands.

However, the presence of these avalanche deposits does not mean that mega tsunamis must have been triggered. If the avalanches broke apart in small stages, they certainly could trigger local tsunami waves, but nothing that would inundate entire islands or threaten far-flung continents. If those mega-waves happened, the waves should also have left evidence on the islands themselves in the form of marine sediments and broken up, wave-carried rocks hundreds of meters above sea level.

These shells come from the island of Lanai, one of the main islands of Hawaii. They were found in 1936 at an elevation a whopping 326 meters (1069 feet!) above sea level. These are by far the highest elevation ocean shells ever found on the Hawaiian Islands. There are other potentially marine deposits on this island, but at far lower elevations – 100 meters or less. If these are a tsunami deposit, the wave would have to have been incredible.

However, there might be other ways to get shells up this high. Due to the advance and retreat of glaciers, sea levels have changed by tens to over a hundred meters during the last million years. While that has been happening, the Hawaiian Islands also change their elevation – as the islands flow away from the hot spot, they are pushed up and down by bends in the Pacific plate, with possible vertical motions of tens to hundreds of meters again.

What would be ideal would be to go to this site and find other evidence of catastrophic wave motion, or to go to other sites on Lanai and see if many of the elevated shell deposits are the same age. Unfortunately, at this spot that cannot happen. Sometime during the Second World War, this site was bulldozed for construction of roads on the island. The site where these shells were collected was recorded in detail, there are good field notes by several geologists, but it is actually impossible to attempt modern geologic analyses on them. All that is left is these notes and a story; marine shells 300 meters above sea level on a Hawaiian island…somehow.

Are these evidence of a prehistoric megatsunami? Or evidence of substantial up and down motion of Hawaiian islands over geologic time? Recent scientists who reinvestigated these shells favored the latter explanation, but found it difficult to say with certainty without a site to examine. So yeah, be careful when you pave a road, you might utterly destroy something that would be really important to check.

Image credit: Crook and Felton, 2008 http://bit.ly/2ggQdUX All the white bars are there for scale and are 5 mm long.

Additional Reference: http://bit.ly/2xN0myR

#Geology #Tsunami #Shell #Lanai #mega tsunami #Wave #hawaii #research #the earth story

"Movie 1. A near-source animation of the tsunami generated by the Tracy Arm landslide.

The tsunami is shown with a photorealistic render and the post-event Planet SuperDove satellite imagery (table S3) draped over topography. Annotations of runup provide satellite-derived trimline elevations. Animation begins with a perspective view of the landslide- and tsunami-impacted areas, shown at a time before the landslide has started to move; at ~30 s after the start of landslide motion, when roughly ¾ of the landslide volume is in the water and a large breaking tsunami with crest elevation of 125 m has been generated; at 1 min, when the tsunami nears maximum runup on the opposite slope and a large breaking bore is headed down Tracy Arm; and the return flow from the maximum runup location sloshes back toward the source area, likely reworking the slide deposits in the area. At 90 s, the tsunami runs ≥150 m up a slope 3 km from the landslide. The tsunami continues down Tracy Arm, with strong amplification along a southern shoreline river mouth with maximum runup near 150 m, before reaching Sawyer Island 3.5 min after the start of landslide motion. Here the tsunami energy splits, with energy continuing to the west in the main Tracy Arm channel and energy traveling northward toward Sawyer Glacier, where runup elevations again exceed 100 m."

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