Sentences with phrase «seismic waves»

During an earthquake, different types of seismic waves travel through the earth.

To come up with the new picture, researchers used seismic waves from earthquakes to detect temperature differences within the mantle, similar to a CT scan.

During an earthquake, different types of seismic waves travel through our planet.

Most earthquake damage results from the shaking caused by seismic waves passing beneath buildings, roads, and other structures.

As seismic waves cross through different materials, they change speed and direction.

The scientists measured seismic waves at 15 local seismic stations over two and a half years, from 2010 to 2013, and seven further stations located on different continents.

During a four - year period, the researchers used sensors to measure relative changes in the velocity of seismic waves moving through the volcano over time.

The new data — based on high - frequency seismic waves — indicate this transition takes place rapidly — within 7 miles.

The above paper further stated that studies had detected seismic waves from wind turbines that were above background levels to distances up to 18 km.

If enough smartphones were triggered by unusually large ground motion, a warning could be issued a few seconds before the strongest seismic waves from the earthquake began.

By listening in on seismic waves, the instruments will provide ever more precise measurements of the core.

By the early 20th century, a global network of the instruments allowed researchers to record seismic waves that had traveled from one side of the planet to the other.

But scientists have long recorded dramatic drops in the speeds of seismic waves near the core - mantle boundary, leading some experts to speculate that this region is partially melted.

She then introduced her students to Web sites containing mathematical simulations about seismic waves.

The probes could communicate with the surface via seismic waves, sending back readings on the constituents and properties of the mantle and core.

There, seismic waves dramatically change speed and direction.

The rapid slip of one block of rock over another in an earthquake releases energy in the form of seismic waves.

Using a test array they installed in Richmond, California — with fiber - optic cable placed in a shallow L - shaped trench, one leg of about 100 meters parallel to the road and another perpendicular — the researchers verified that they could use seismic waves generated by urban traffic, such as cars and trains, to image and monitor the mechanical properties of shallow soil layers.

By studying the speed at which seismic waves travel in different directions through the same material, a phenomenon called seismic anisotropy, the researchers found that interior of the Nazca plate had been deformed during subduction.

For the purpose of this study, a team of geologists from the Nanjing University, China, and the University of Illinois studied the echoes generated by seismic waves produced during earthquakes to scan below the surface of Earth, much like an ultrasound is used to see inside patients.

For decades, researchers have studied the interior of the Earth using seismic waves from earthquakes.

When an earthquake strikes, the release of energy creates seismic waves that often wreak havoc for life at the surface.

Geophysicist Xiaodong Song of the University of Illinois at Urbana - Champaign and his colleagues studied seismic waves from doublets — pairs of earthquakes from the same place but occurring at different times.

Back on Earth at least one group of astronomers is using ground - based telescopes to search for seismic waves rippling through the atmospheres of Jupiter and Saturn, a phenomenon roughly analogous to earthquakes on our own world.

«By modeling the behavior of seismic waves in Earth's mantle, we discovered a transition inside the plate from the top, where the rocks didn't deform or flow very much, to the bottom of the plate, where they are more strongly deformed by tectonic forces,» Beghein said.

With super strong legs, complete with hooves, he can generate destructive seismic waves with a single stomp.

By timing how fast seismic waves pass through Earth under Antarctica, the researchers were able to determine that the mantle regions beneath east and west are very different.

FOR IMMEDIATE RELEASE The energy released by 2012's Superstorm Sandy in the US was so immense that it triggered seismic waves which registered on equipment designed to detect earthquakes.

«Typically, P - waves are the fastest, followed by scattered waves associated with variations in seismic wave speed within the medium.

In preparation for exascale, McCallen is working with Hans Johansen, a researcher in Berkeley Lab's Computational Research Division (CRD), and others to update the existing SW4 code — which simulates seismic wave propagation — to take advantage of the latest supercomputers, like the National Energy Research Scientific Computing Center's (NERSC's) Cori system.

Although this region is far too deep for researchers to ever observe directly, instruments that can measure the propagation of seismic waves caused by earthquakes allow them to visualize changes in Earth's interior structure; similar to how ultrasound measurements let medical professionals look inside of our bodies.

Like all earthquake early warning systems, SASMEX uses algorithms to process incoming seismic waves from earthquakes to determine the magnitude of the earthquake.

The lateral shaking may have been amplified by a phenomenon noted during the Mexico City earthquake in 1985, in which seismic waves bounce off firmer rock below, and intensify the shaking at ground level.

After an earthquake, seismic waves propagate faster in cooler rock and slower in hotter rock.

Using a new technique called S - wave receiver function, which can distinguish how long seismic waves take to travel through the lithosphere versus through the underlying semimolten layer called the asthenosphere, the researchers were able to compute plate thicknesses by comparing the travel times of the waves.

Unlike a GPS method proposed last year, which detects seismic waves transmitted through the Earth's crust to distant receivers, the new ground - based system takes real - time measurements of vertical ground motion — the type of fault movement more likely to produce tsunamis (Journal of Geophysical Research, DOI: 10.1029 / 2006JB004640).

Ward and Delph calculated their plutonic - to - volcanic ratio by comparing the volume of regions where seismic waves travel extremely slowly beneath volcanically active regions, indicating some melt is present, with the volume of rock deposited on the surface by volcanoes.

In a pair of recently published papers, a team led by Berkeley Lab researcher Jonathan Ajo - Franklin announced they had successfully combined a technology called «distributed acoustic sensing,» which measures seismic waves using fiber - optic cables, with novel processing techniques to allow reliable seismic monitoring, achieving results comparable to what conventional seismometers can measure.

Everything from big quakes to tiny tremors sends seismic waves echoing through Earth's interior.

«Earthquake hazard is particularly high in the eastern and central U.S. because seismic waves travel so efficiently through the old, cold rocks in the middle of the plate, and that shaking carries very far,» says Blanpied.

Other papers in the issue examine how deep sea sediments may affect seismic wave readings, and evaluate how the Cascadia Initiative's data collection from ocean bottom seismometers has improved over the first three years of the study.

By looking for faster seismic wave movement, scientists can map where the mantle is flowing today and where it has flowed in the past.

While Dorfman and other scientists may never see mantle core samples firsthand, the observations and measurements from the lab will help scientists interpret what seismic waves may be telling them.

Current global seismographic networks detect seismic waves rippling through the planet, but they can saturate for quakes larger than magnitude 7, leading to underestimates of quake strength that can have dire consequences.

«It's a step toward manipulating seismic waves and done in a genius way.»

And that means higher risk for long bridges and skyscrapers, which are more vulnerable to the long - period seismic waves released by very large quakes, Field says.