Shetland has been hitting past times at to the lowest degree ii to a greater extent than tsunamis inwards the past times 10,000 years than previously thought, as well as scientists are working to position where the giant waves originated.
 |
| Dury Voe inwards Yell, Shetland, is ane of the sites where researchers possess got constitute evidence of a recent seismic sea wave hitting the British Isles [Credit: PlanetEarth Online] |
Scientists funded past times NERC possess got identified sands on Shetland that they nation seek out additional tsunamis hitting Shetland 5,000 as well as 1,500 years ago. This could hateful that tsunamis are a to a greater extent than mutual occurrence than previously idea inwards the UK.
medico Sue Dawson from the University of Dundee as well as Professor Dave Tappin from the British Geological Survey (BGS) are working to position what could possess got caused these tsunamis, using novel computed tomography (CT) as well as seismic technology.
medico Dawson said: "We constitute sands aged 5,000 as well as 1,500 years erstwhile at multiple locations inwards Shetland, upwards to thirteen meters higher upwards body of body of water level. These deposits possess got a similar sediment grapheme every bit the Storegga effect as well as tin hence survive linked to seismic sea wave inundation. We are straightaway using a CT scanning machine at the University of Dundee to await at our samples inwards detail."
"For the offset time, we'll possess got a consummate 3-D persuasion of the cores we've extracted from the footing as well as from lochs as well as seabeds. This especial volition demonstrate us which direction the moving ridge was travelling in, position the elements introduce inwards the sand, as well as much more. This volition survive the offset fourth dimension that such a bird of especial has been captured from these prehistoric seismic sea wave events."
Both scientists concur that a submarine landslide, which is an underwater landslide that moves vast amounts of sediment across the seabed, generated the tsunamis that hitting Shetland.
While medico Dawson has been investigating the sand samples, Professor David Tappin has been focusing on the seabed to endeavor to pinpoint where the tsunamis originated.
 |
| Map showing Basta Voe's depths as well as yellowish pinpoints mark seismic sea wave sands [Credit: PlanetEarth Online] |
"Identifying landslides on as well as below the seabed using existing mapping methods is non every bit straightforward every bit mightiness survive imagined. We excogitation to exam some theoretical models to run across if nosotros tin reproduce the 1,500 as well as 5,000 twelvemonth tsunamis."
"We volition survive creating a digital elevation model of the coasts of the Shetlands as well as the surrounding seabed. We volition as well as so reproduce the landslide motion that volition generate the tsunami. The numerical model volition overflowing the province as well as we'll await at the elevation of the sediments to run across if they fit amongst what's on Shetland. That volition possess got us much closer to finding where the actual tsunamis began."
"Submarine landslides are much to a greater extent than poorly understood than around all types of natural hazards, such every bit river floods or tempest surges. But they tin survive far larger than whatever landslide seen on land—the Storegga slide contained 300 times the amount of sediment carried each twelvemonth past times all of the world's rivers combined."
"Submarine landslides tin also plough over off on slopes of only ane or ii degrees, as well as nosotros nevertheless don't know precisely how they are develop inwards motion, except that earthquakes are considered to survive the most mutual trigger. It is critical that nosotros acquire more."
The query is business office of the Landslide-Tsunami project, ongoing query that forms a cardinal chemical factor of NERC's Arctic Research Programme. The projection aims to uncovering what causes enormous submarine landslides, what the touching on of slides inwards unlike locations as well as of unlike magnitude would survive on the UK, as well as what the likelihood of such an effect mightiness be, given the pregnant scale of Arctic climate change.
Author: Sarah Mcdaid | Source: PlanetEarth Online [September 18, 2018]
Sumber http://archaeologynewsnetwork.blogspot.com
Buat lebih berguna, kongsi:
