Tag: seamount

Undersea Volcano Apparently Erupts Off Oregon Coast, No Tsunami Threat



Location of the Axial Seamount off the Oregon coast. (NOAA)
Location of the Axial Seamount off the Oregon coast. (NOAA)



SAN FRANCISCO (CBS SF) — An active undersea volcano off the Oregon Coast has apparently begun a new eruption — an event which was predicted by two scientists months ago.

Based on a swarm of thousands of earthquakes and a seafloor drop of 8 feet, the eruption of the submarine volcano called Axial Seamount commenced on April 24. 

The apparent eruption was observed by scientists in real time, with the help of high-tech instruments installed by scientists at the University of Washington.

“It was an astonishing experience to see the changes taking place 300 miles away with no one anywhere nearby, and the data flowed back to land at the speed of light through the fiber-optic cable connected to Pacific City — and from there, to here on campus by the Internet, in milliseconds,” Washington oceanogoraphy professor John Delaney said in a statement.

The volcano is located along the boundary between two tectonic plates — the Pacific Plate and the Juan de Fuca plate — about 300 miles west of Oregon.

In a blog post last autumn, Bill Chadwick of Oregon State University and Scott Nooner of the University of North Carolina at Wilmington predicted that the Axial Seamount would erupt within the next 15 months based on a repeated pattern of seafloor elevation changes before, during, and after eruptions dating back to 1998.

Scientists say the activity is not strong enough to be felt on land nor is it likely strong enough to produce a tsunami.

View Article Here   Read More

Undersea Mysteries Mapped by Satellite Gravity Sensors



A submersible descends into a volcanic vent off Las Gemelas seamount.
Satellites have recently discovered thousands of new seamounts, like the one above being explored by a submersible.
Photograph by Brian Skerry, National Geographic Creative
Dan Vergano

National Geographic

Space missions reveal hidden hills and buried rifts in the ocean depths.

Ancient rifts hide under seafloor sediments along with thousands of uncharted underwater mountains, satellite images revealed on Thursday.

Most of the world's deep ocean remains poorly charted, as the fruitless search for the missing Malaysia Airlines Flight 370 in the Indian Ocean earlier this year showed. The new satellite images released by the journal Science map undersea features as small as three miles across (five kilometers) for the first time.

The satellites mapped much of the world's oceans, including the Gulf of Mexico, South China Sea, and South Atlantic.

"The only way to see ocean floor topography quickly and comprehensively is from space," says study lead author David Sandwell of the Scripps Institution of Oceanography in La Jolla, California. "Ships would take another 200 years to do this mapping, at present rates." (Read "Mountains in the Sea" in National Geographic magazine.)

Instead, the study found the hidden geography using two spacecraft, the European Space Agency's CryoSat-2 and NASA's Jason-1, both oceanography satellites that were designed to track sea-level changes.

Newly released globe art showing detailed satellite-generated  floor of Indian Ocean.
A triple seam meets where three crustal plates clash beneath the Indian Ocean.
source: Scripps Institution of Oceanography
Newly released globe art showing detailed satellite-generated  floor of the Atlantic Ocean.
Satellite measurements reveal hidden hills and furrows under the South Atlantic.
source: Scripps Institution of Oceanography
Deep Gravity
To map the seafloor, the satellites detect ripples and dips in the ocean's surface. Ridges and seamounts, or undersea mountains, are massive enough to exert a gravitational pull that makes sea levels drop by as much as 3.9 inches (10 centimeters) above the feature.

Fractures and rifts in the seafloor, in contrast, elevate sea surface levels due to a reduced gravitational attraction above their depths.

Stitching together the pattern of these sea-level deviations, the study authors detected geological features that were hiding underneath the soft layers of sand and sediment coating the seafloor. The finds include —Several thousand seamounts roughly 0.6 to 1.2 miles (1 to 2 kilometers) high, previously unknown.

—Subsea ridges jutting at a southward angle from South America and Africa—the latter some 500 miles (800 kilometers) long and 62 miles (100 kilometers) wide—once joined but severed more than 83 million years ago by a spreading South Atlantic.

—An "extinct" ocean ridge stretching under the Gulf of Mexico where ocean crust once spread apart when it was tectonically active.

The maps are "a breakthrough in space-based marine gravity observation," say oceanography experts Cheinway Hwang of National Chiao Tung University in Taiwan and Emmy Chang of National Taiwan University, in a commentary accompanying the study.

Tour of a Seamount graphic
William E. Mcnulty; Theodore A. Sick­ley. Art: Stefan Fichtel. Sources: 2010 Census of Marine Life; Karen Stocks, Scripps; Christopher Kelley, HURL; University of Hawaii

Map Quest
About 80 percent of the world's ocean area has not been mapped using depth soundings from ships, the study notes. The seafloor features, and depths, revealed by the study serve as a starting point for remedying the problem, Sandwell says.

The results should aid geologists looking for undersea mineral resources and help to explain how deep-sea currents flow across the seafloor.

The CryoSat-2 satellite will continue to take sea surface readings from its 250-mile-high orbit (400 kilometers) for the next few years. With more data, the gravity maps could be refined to reveal hundreds of thousands of previously unknown seamounts less than 3,300 feet (1 kilometer) high dotting the ocean floor.

The one thing the maps won't do is reveal the location of missing airplanes, Sandwell says. "Of course we looked when the [Malaysia Airlines] plane crashed," he adds. But given the resolution of the gravity maps, "we think the gravity model will be very helpful for reconnaissance maps on future searches."

View Article Here   Read More

Creative Commons License
This work is licensed under a
Creative Commons Attribution 4.0
International License
.
unless otherwise marked.

Terms of Use | Privacy Policy



Up ↑