Sentences with phrase «seismic waves travel»

As seismic waves travel, seismograms can detect variations in their speed.

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

Instead, he claims that the inner core behaves like a giant asymmetric crystal, aligned with the Earth's axis so that seismic waves travel faster in that direction.

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.

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

Beneath the eastern United States, scientists have observed an area where seismic waves travel more slowly than expected.

«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.

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.

Seismic waves travel through different geological materials at different speeds, so observing how waves change as they emanate from a source can reveal subsurface geology.

Seismic waves travel in different ways through different types of rock.

«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.

This strange but educated guess came in response to strong evidence that seismic waves traveling through the inner core along the axis of the magnetic poles complete their trip through Earth about four seconds more quickly than do waves traveling from one side of the equator to the other.

In 2008, researchers examining data from the San Andreas Fault Observatory at Depth reported detectable changes in the way seismic waves traveled through fault rock in the hours before two quakes.

Not exact matches

The seismic waves produced by the explosions will travel tens of kilometres down before being reflected back to the surface and detected by the 1000 instruments deployed.

From that starting point, seismic waves will radiate away from Seattle, sending the biggest shakes in the direction of travel of the rupture.

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.

Researchers calculated temperatures at the bottom of the crust, which varies in thickness, by measuring the velocity of seismic waves that travel near the interface between the lower crust and uppermost mantle.

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

Scientists will use that series of tests to see how seismic waves are affected when they travel through fragmented rock as opposed to more coherent granite.

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.

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.

Seismic waves are waves of energy produced by earthquakes, explosions and volcanic eruptions, which can travel long distances below Earth's surface.

More than 15 years ago, Ehman began experimenting with mechanically produced seismic waves — called shear waves — that could travel through human tissue.

The evidence comes both from the time it takes seismic waves to travel through the core and from studies of the Earth's natural vibration frequencies.

A decade ago, geophysicists observed that seismic waves from earthquakes that travel through the core parallel to the Earth's axis of rotation pass through the Earth between 2 and 4 seconds faster than if they travel parallel to the plane of the equator.

To create this big - picture view, University of Southern California geophysicist Thorsten Becker used seismic tomography, which tracks waves produced by earthquakes as they travel around and through the earth.

This technique leverages more information than competing methods, using forward waves that travel from the quake's origin to the seismic receiver and adjoint waves, which are mathematically derived waves that travel from the receiver to the quake.

In all, 374 seismic stations recorded the faint vibrational waves from distant earthquakes as they traveled through the rocks beneath.

seismic wave An energy wave traveling through the ground produced by an earthquake or some other means.

(These disturbances travel at the speed of light, while the fastest seismic waves of an earthquake propagate at several kilometers per second, which means that monitoring the disturbances could potentially improve existing early - warning systems by seconds or even minutes.)

«What seismic tomography does is let you determine the travel times of these waves.