Sentences with phrase «on seismic waves»

Eavesdropping on seismic waves rumbling through our planet helps us work out its internal structure, and now one team aims to map the entire mantle in this way

Because geologists haven't traveled into the planet to see what's there, they rely on seismic waves to explore Earth's inner layers.

Not exact matches

His absence would go on to make seismic waves, as his teammates would eventually finish fourth in the league and miss out on Champions League qualification for the first time since 1996.

To spot such tiny displacements, however, scientists must damp out vibrations such as the rumble of seismic waves, the thrum of traffic, and the crashing of waves on distant coastlines.

Inge Lehmann, a Danish seismologist, made meticulous notes on seismic activity, including the arrival time of P - waves, at various seismographic stations.

Seismic studies also revealed that all earthquakes created a P - wave «shadow zone» on Earth's surface where primary waves didn't arrive at some seismic stations; the location of the P - wave shadow zone varied with the point of origin of the eartSeismic studies also revealed that all earthquakes created a P - wave «shadow zone» on Earth's surface where primary waves didn't arrive at some seismic stations; the location of the P - wave shadow zone varied with the point of origin of the eartseismic stations; the location of the P - wave shadow zone varied with the point of origin of the earthquake.

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

The simulations rely on the LLNL - developed SW4 seismic simulation program and the current best representation of the three - dimensional (3D) earth (geology and surface topography from the USGS) to compute seismic wave ground shaking throughout the San Francisco Bay Area.

The area that could be explored using lake microseisms is limited to the region close to a lake, but Koper writes that lake microseisms emanating from the Great Salt Lake might reach far enough to visualize how seismic waves would move beneath Salt Lake City, which sits on the Wasatch Fault, in a major earthquake.

Alerts issued by earthquake early warning systems, called EEWs, are based on several parameters: the depth and location of the quake's origin, its estimated magnitude and the ground properties, such as the types of soil and rock that seismic waves would travel through.

Earlier attempts by other researchers often approximated the physics of wave propagation and focused mainly on the arrival times of only certain types of seismic waves, such as the P (pressure) and S (shear) waves, which travel at different speeds.

Romanowicz, who uses seismic waves to study Earth's interior, had previously worked with French, then a graduate student, on a tomographic model of the upper 800 kilometers of the mantle, which showed periodic hot and cold regions of rock underlying hotspot volcanoes.

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.

He worries that Montelli's team looked at only one type of seismic wave and that their analysis relied on «a lot of assumptions.»

The initial seismic waves echoed off the solid mountains and increased the duration of lateral shaking on the soft ground.

The difference is that engineers do not want merely to steer seismic waves around buildings, because doing so would end up inflicting damage on other structures.

The initial warning relied on preliminary seismic data that registered the earthquake as only magnitude 7.9, but it can take tens of minutes after the initial detection for long - period seismic waves to provide a fuller picture of the earthquake's energy.

Simons and his colleagues combined seismic data recorded around the world, crustal movements on Japan recorded by GPS, and tsunami waves recorded at buoys at sea.

The mineral has a unique layered structure that causes seismic waves to change velocity depending on their direction of travel — just as in the D» layer.

«Previously, the models were predominantly based on seismic measurements — from the course that seismic waves travel, you can deduce, for example, boundaries between the Earth's crust and mantle.

As Tulaczyk watched the Herc on Jan. 17, 2013, the lake remained a mere silhouette pieced together from noisy geophysical measurements involving radar, lasers shot down from satellites and the seismic echoes of shock waves released by explosives detonated in shallow holes in the ice.

Seismologist Raphaël Garcia of the University of Toulouse in France and his colleagues, on the other hand, analyzed two wave types from three moonquakes after calibrating the seismic stations.

That's because the larger surface - wave magnitudes record low - frequency energy, while Richter and coda magnitudes are based on high - frequency seismic waves that people usually feel during real quakes.

They were also able to distinguish between seismic and acoustic events on the networks, which can be helpful in determining whether the detected signals represent subsurface movement at a volcano or surface explosions that create acoustic waves.

«Seismic waves from volcanoes provide complementary information on what is going on in the subsurface and are often more effective at forecasting eruptions.»

«This study shows how we can expand the use of seismic data by looking at the acoustic waves from volcanic explosions that are recorded on seismometers,» explained Fee.

By measuring those waves using hundreds of seismic stations installed on the surface, near places such as Hawaii, Iceland, and Yellowstone National Park, researchers can deduce whether there are narrow mantle plumes or whether volcanoes are simply created from magma that's absorbed in the sponge - like shallower mantle.

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.

Because we can not sample the deep Earth, we must deduce its composition either by looking at the clues hidden in igneous and metamorphic rocks, or by examining proxies for composition and structure such as the three - dimensional variation of the velocity of seismic waves produced by earthquakes and sampled by networks of seismometers on the surface.

So instead, researchers relied on natural vibrations: They listened for seismic waves from the gurgling and popping of water and steam percolating through the ground near Old Faithful, using 133 seismographs spread across a square kilometer.

Rathje is a geotechnical earthquake engineer, meaning that she focuses on how the ground underneath everything, from buildings to roads to dams, moves in response to seismic waves.

There are many things besides gravitational waves that can upset LIGO's sensitive instrumentation, including vehicles on nearby roads, seismic waves from earthquakes, slight temperature differences between the detector arms and even the tidal tugging of the Sun and the Moon.

These waves make a star's surface pulse in and out in different places, as happens on Earth from the seismic waves of an earthquake.

Upper mantle seismic anisotropy of Antarctica from shear wave splitting analysis, 11th International Symposium on Antarctic Earth Sciences, Edinburgh, Scotland, 10 - 16 July, 2011.

The main body of contents is composed of scientific papers on the various aspects of seismology, including: investigation of specific earthquakes, theoretical and observational studies of seismic waves; inverse methods for determining the structure of the earth or the dynamics of the earthquake source; seismometry; earthquake hazard and risk estimation; seismotectonics; earthquake engineering; paleoseismology; tsunami studies.

Over the wide frequency range of seismic waves transmitted through the Earth (hundreds of seconds to ten cycles per second), the sensors of the permanent and transportable seismic and magnetotelluric arrays will resolve the smallest background motions at the quietest of sites, while remaining «on scale» for all but the largest ground motions from regional earthquakes.

But they still took great pains to rule out alternative explanations, scrutinizing a variety of detector data and the output of numerous on - site instruments that measure seismic activity, radio interference and many other possible sources of «noise» that could conceivably mimic a gravitational - wave signal, team members said.

Turns out California is a century overdue for a major seismic shake - up, the kind that requires a lot of horrified staring at computer - generated wave patterns and flashing red dots on maps beforehand, and a lot of Roland Emmerich - style just - in - the - nick - of - time - except - occasionally - not fleeing afterward.

If The King's Speech risks being too cute by half in its depiction of how this royal without a voice comes to find one in his nation's hour of need, Hooper and screenwriter David Seidler neatly avoid that trap by training their sights on a much bigger subject — namely, how the wireless waves of radio affected seismic changes to the nature of politics and society at large, turning public figures into performers, and narrowing the distance between classes.

She posed the questions on how earthquake magnitude is measured and how to model a seismic wave with trigonometric functions.

Research suggests a new threat to life on Earth from the meteorite's crash: Via seismic waves, the impact triggered massive undersea eruptions, as big as any ever seen in our planet's history.

Ethereal and non objective, her marks float on white surfaces, referential to wave or seismic charts.

That didn't happen here, although one proposed farm was abandoned because the vibration from the wind turbines would have increased the «seismic noise» at the Laser Interferometry Gravitational Observatory», half of which is located on the Hanford Site, looking for gravitational waves.

Using that information plus information he's already compiled for every part of the world on the attenuation characters for seismic waves and the fragility of buildings you get an immediate estimate for the number of dead and injured.

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.

Scientists typically image the inside of the Earth by observing seismic waves with stations on land, helping researchers answer questions about how the planet works, including how it maintains its relatively constant temperature.