Erosion From Ancient Tsunami In Northern California

2017-10-03T10:12:53+00:00 October 3, 2017|

When you're investigating complex questions, you've often got to dig deep to find answers. A group of UC Santa Barbara geologists and their colleagues studying tsunamis did exactly that. The team used ground-penetrating radar (GPR) to search for physical evidence of a large tsunami that pounded the Northern California coast near Crescent City some 900 years ago. They discovered that the giant wave removed three to five times more sand than any historical El Niño storm across the Pacific Coast of the United States. The researchers also estimated how far inland the coast eroded. Their findings appear in the journal Marine Geology.

Scientists Discover Fault Linked To Unusually High Tsunami Risk In Alaska

2017-08-03T11:49:39+00:00 August 3, 2017|

A team of scientists found something hidden off the coast of Alaska that suggests a significant risk for future tsunamis in the area. The team made the discovery as they were conducting seismic surveys off the Alaskan coast to better understand the regional plate tectonics and subduction. The research, published in Nature Geoscience, provides evidence for an increased tsunami risk in an area previously thought to be low risk for tsunamis. The feature was found by a research team at the Lamont-Doherty Earth Observatory of Columbia University. It is similar to the feature that produced the devastating Tohoku tsunami in 2011 off Japan, which killed approximately 20,000 people and caused three nuclear reactors to melt down.

This Cave Holds A Spectacular Record Of 5,000 Years Of Tsunamis

2017-07-21T12:08:50+00:00 July 21, 2017|

Benjamin Horton remembers being in Southeast Asia just months after the devastating 2004 Indian Ocean tsunami. “They were still dealing with a disaster,” he says. “The roads were in a terrible state.” But in those days, the formerly niche field of tsunami research had taken on new urgency. Horton, who studies sea levels at Rutgers University and Nanyang Technological University, was just one of dozens of researchers who came in search of answers: Had this happened before? Would it happen again?

Slow Earthquakes In Ocean Subduction Zones Shed Light On Tsunami Risk

2017-06-16T10:49:50+00:00 June 16, 2017|

Understanding "slow-slip" earthquakes on the seafloor—seismic events that occur over a period of days or weeks—is giving researchers new insights into undersea earthquakes and the subsequent creation of tsunamis. Through an ocean discovery program supported by the National Science Foundation (NSF), scientists are studying the seafloor off the coast of Japan. The region could provide vital clues. Two tectonic plates, the Pacific Plate and the Eurasian Plate, meet there. In this ocean trench zone, the Pacific plate slides beneath the Eurasian plate. Such subduction zones are often associated with large earthquakes.

Nasa Study Challenges Long-held Tsunami Formation Theory

2017-07-11T13:27:26+00:00 May 4, 2017|

A new NASA study is challenging a long-held theory that tsunamis form and acquire their energy mostly from vertical movement of the seafloor. An undisputed fact was that most tsunamis result from a massive shifting of the seafloor—usually from the subduction, or sliding, of one tectonic plate under another during an earthquake. Experiments conducted in wave tanks in the 1970s demonstrated that vertical uplift of the tank bottom could generate tsunami-like waves.

Telltale Tsunami Sounds Could Buy More Warning Time

2017-04-11T09:10:43+00:00 April 11, 2017|

Buoys operate as today's state-of-the-art tsunami-detection system. Seismic data can tell officials that an underwater earthquake has occurred, but strategically placed floating sensors often give the key warning if the earthquake has created a potentially devastating series of waves. Even so, warnings are often issued only minutes before a tsunami hits—if at all.

Member Highlight: A New Tsunami-Warning System: Scientists Devise way To Relay Sound Signals Under Water

2018-01-02T13:58:39+00:00 January 17, 2017|

After successfully testing a long-range underwater communications system that worked under Arctic Ocean ice, an engineering team at Woods Hole Oceanographic Institution (WHOI) adapted it for a very different environment—the tropics—and for a different purpose—to provide warnings of impending tsunamis. While the Arctic sound-signaling system lets researchers communicate with robotic vehicles operating beneath sea ice, the tropical system, tested in 2016 off Indonesia, is designed to relay signals “from an undersea sensor network to shore, where they can be used to estimate the level of the potential tsunami,” said Lee Freitag, the WHOI engineer who led the project.

Marine Biologists Observe Sea Life After The 2011 Tsunami

2016-12-21T08:55:09+00:00 December 21, 2016|

The tsunami of 2011 is well remembered in Japan. Some towns have recovered, while others struggle to return to a life that once was. The same is true for ecosystems. In a new study in PLOS ONE, Japanese researchers report how the sea life in different coastal regions of Japan struck by the tsunami have flourished or faltered. "We watched in real time an ecosystem recover from a large natural disaster," said Reiji Masuda, who directs the Maizuru Fisheries Research Station at Kyoto University and led the study. "We could observe how species recovered and whether any invading species could thrive."

Into The Abyss: Our Planet’s Biggest Exposed Fault Has Been Seen For The First Time

2016-12-02T09:10:41+00:00 December 2, 2016|

What may be the largest exposed fault on Earth has been seen and documented by scientists for the first time. The 'Banda Detachment' fault in eastern Indonesia would explain a 7.2km (4.4 mile) deep abyss under the Banda Sea, which until now has remained a mystery to geologists. This area where the fault was found sits in the Ring of Fire, an area in the basin of the Pacific ocean where many volcanic eruptions and earthquakes occur. Sitting under the Banda Sea is the Weber Deep – the deepest point in our planet's ocean that does not sit in a trench.

A Melting Greenland Glacier Seems To Prompt Worse Tsunami Events

2016-06-29T14:40:08+00:00 June 29, 2016|

When Greenland's melting glaciers lose large chunks of ice, it's a violent process. Last year, for instance, scientists documented that gigantic glacial earthquakes are triggered by the rolling and tumbling of billion-ton icebergs as they break away and hit the glaciers to which they once belonged – hard

A New Warning System For Tsunamis

2016-06-08T09:49:45+00:00 June 9, 2016|

Scientists have developed the Time Reverse Imaging Method to take real-time data from the ocean sensors and use that information to recreate what the tsunami looked like when it was born. Once scientists have the tsunami source pinpointed, they can use it to make better predictions about what will happen once the waves reach shore. This new method is fast enough to compete with existing algorithms but much more accurate.

How Earthquakes Help Capture Carbon Dioxide

2016-06-02T13:08:49+00:00 June 2, 2016|

After an earthquake, less than 20% of the carbon in the water from plants and soil had been released through oxidation before being carried away by the river. Thus, they estimate that most of the 14 megatonnes of carbon that was probably released by the earthquake ended up being stored away.

Impact Of Tsunami On The Columbia River

2015-03-02T14:03:22+00:00 February 27, 2015|

Engineers at OSU have completed one of the most precise evaluations yet done about the impact of a major tsunami event on the Columbia River, what forces are most important in controlling water flow and what areas might be inundated.

Sampling the Pacific for Signs of Fukushima

2016-06-29T10:10:05+00:00 April 3, 2012|

An international research team is reporting the results of a research cruise they organized to study the amount, spread, and impacts of radiation released into the ocean from the tsunami-crippled reactors in Fukushima, Japan.

Deep Ocean Floor Can Focus Tsunami Waves

2016-06-29T10:10:14+00:00 March 13, 2012|

As the waves of a tsunami approach a coastline, the topography of the seafloor near the coast plays a major role in determining how large those waves become and what places get hit harder than others.

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