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.
New research finds large earthquakes can trigger underwater landslides thousands of miles away, weeks or months after the quake occurs. Researchers analyzing data from ocean bottom seismometers off the Washington-Oregon coast tied a series of underwater landslides on the Cascadia Subduction Zone, 80 to 161 kilometers (50 to 100 miles) off the Pacific Northwest coast, to a 2012 magnitude-8.6 earthquake in the Indian Ocean -- more than 13,500 kilometers (8,390 miles) away. These underwater landslides occurred intermittently for nearly four months after the April earthquake.
Tonga is a seismologists' paradise, and not just because of the white-sand beaches. The subduction zone off the east coast of the archipelago racks up more intermediate-depth and deep earthquakes than any other subduction zone, where one plate of Earth's lithosphere dives under another, on the planet. Tonga is such an extreme place, and that makes it very revealing," said S. Shawn Wei, a seismologist who earned his doctorate at Washington University in St. Louis and now is a postdoctoral fellow at the Scripps Institution of Oceanography in San Diego. That swarm of earthquakes is catnip for seismologists because they still don't understand what causes earthquakes to pop off at such great depths.
Most volcanic eruptions on Earth happen in a hidden, dark place: deep underwater. Scientists rarely detect these outbursts on the sea floor, but last year, they caught a seamount eruption in the act. Now, researchers have characterized it in unprecedented detail—showing how a rash of earthquakes preceded the eruption and how bulging of the volcano’s surface was used to successfully forecast the eruption. Scientists say the results will help them understand how other volcanoes around the world behave.
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.
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.
The motion of the ocean is rocking our world, or at least helping to give it a vigorous shake in some locations when the conditions are right, a team of seismologists says.
There will be a 7-day training workshop at Lamont-Doherty Earth Observatory for students and early-career scientists who want to gain experience with the analysis of multichannel seismic reflection data from June 22-29, 2015.
An ocean engineer at the University of Rhode Island has found that a massive underwater landslide, combined with the 9.0 earthquake, was responsible for triggering the deadly tsunami that struck Japan in March 2011.
New research has revealed the causes and warning signs of rare tsunami earthquakes, which may lead to improved detection measures.
Radiation In Calif. Kelp? Scientists To Test West Coast Water 3 Years After Fukushima Nuclear Meltdown
California biologists plan to test coastal kelp for traces of radioactive material three years after the nuclear meltdown in Fukushima, Japan.