Sentences with phrase «ground motion»

Scientists rely on the public's reporting of ground shaking to characterize the intensity of ground motion produced by an earthquake.

In addition, the new data also provide insights on the expected ground motion in the event of an earthquake in the region.

The analysis identified more than 6,000 fire stations, more than 800 hospitals and nearly 20,000 public and private schools that may be exposed to strong ground motion from earthquakes.

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.

For each increase in magnitude, an earthquake produces 10 times more ground motion and releases about 32 times more energy.

For seismic hazard assessment, the study of ground motion is where the rubber meets the road.

Dividing the area into a grid of 210 - meter cells, they simulated ground motion for a magnitude 7 Seattle fault earthquake and then further subdivided into 5 - meter cells, applying anticipated amplification of shaking due to the shallow soil layers.

She is also the current co-chair of the Geotechnical Extreme Event Reconnaissance Association (GEER), which deploys geotechnical engineers around the world after major earthquakes (and more recently other natural disasters such as floods) to collect data on ground motions and secondary effects like landslides and their impacts on infrastructure.

Ivan's research interests focus on areas relevant to seismic hazard and risk assessments including seismotectonics, seismicity, strong motion seismology, both empirical and numerical ground motion modeling, site response analysis, and induced seismicity.

Researchers at Berkeley Lab, LLNL and UC Davis are utilizing ground motion estimates from a regional - scale geophysics model to drive infrastructure assessments.

It runs from 1 to more than 8 and is calculated by the peak ground motion as recorded by seismographs.

Simulated ground motions for an M 7.0 Hayward Fault earthquake showing (a) the magnitude of ground velocity at 10 s, (b) ShakeMap based on peak ground velocity for the 1D model, and (c) and (d) the same for the 3D model.

The Android app harnesses a smartphone's motion detectors to measure earthquake ground motion, then sends that data back to the Berkeley Seismological Laboratory for analysis.

I have a feeling that as we get the strong motion records, we will see that the Haiti quake was much worse because of stronger ground motion where the people were and much weaker construction (i.e. no earthquake resistant design and generally poorer quality of construction and construction materials — no wood).

Transforming hazard into risk: Researchers at Berkeley Lab, LLNL and UC Davis are utilizing ground motion estimates from a regional - scale geophysics model to drive infrastructure assessments.

«Due to computing limitations, current geophysics simulations at the regional level typically resolve ground motions at 1 - 2 hertz (vibrations per second).

So to predict how an earthquake would affect infrastructure in the San Francisco region, researchers might look at a past event that was about the same size — it might even have happened somewhere else — and use those observations to predict ground motion in San Francisco.

Seismometers and other such instruments record ground motions occurring at all frequencies, but seismologists typically pay attention to only those in ranges where the telltale signals of earthquakes reside.

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).

Past simulations resolved ground motions from low frequencies up to 0.5 - 1 Hertz (vibrations per second).

Tracking ground motion also improves tsunami warnings.

Seattle is prone to strong shaking as it sits atop the Seattle Basin — a deep sedimentary basin that amplifies ground motion and generates strong seismic waves that tend to increase the duration of the shaking.

«The extra time we took to include the refined ground motion detail was worth it.

The diamond - bit grinder head reduces the risk of pain from cutting claws too short, by providing an even and steady grinding motion.

More than 500 seismologists and geologists worked for 6 years, using satellite measurements, field surveys, historical records of earthquakes, and geologic evidence of ancient ground motions to document the hazards for all land areas on Earth, says the project's director, Domenico Giardini of the Swiss Seismological Service in Zürich.

This fault is capable of M 7 earthquakes and presents significant ground motion hazard to the heavily populated East Bay, including the cities of Oakland, Berkeley, Hayward and Fremont.

The recent study reports ground motions simulated for a so - called scenario earthquake, one of many possibilities.

Seismic waves cause perceptible ground motion if they are strong enough.

In this study, Tramelli and her colleagues used the recorded waveforms from the 2012 Emilia seismic sequence to simulate a seismic sequence that triggered end - to - end earthquakes along adjacent fault patches, observing the affect of continuous ruptures on the resulting ground motion and, consequently, its impact on critical structures, such as dams, power plants, hospitals and bridges.

Previous studies identified three sub-events at intervals of 20 seconds in the seismic signals recorded during the 1980 Irpinia earthquake sequence, whose shared ground motion caused more than 3000 deaths and significant damage to structures.

The amplification of ground shaking, directivity of seismic energy and geological features that may affect ground motion are very important to the outcome of ground failure, say authors.

«Every year, unexpected ground motions from sinkholes, landslides and levee failures cost millions of dollars and many lives,» said Jones.

«Usually I look to certain factors that influence ground motion at a specific site — proximity to the fault rupture, directivity of the rupture process and the geology underneath the site,» said Boatwright.

While soil saturation — whether the soil is dry or saturated with water — is the most important factor when analyzing the potential impact of landslides, the details of ground motion rank second.

«This event did not produce a tsunami,» Segall says, «but if we can detect potentially catastrophic ground motion in its early stages, we might be able to issue tsunami warnings in the future.»

This technique could identify ground motion as small as one millimeter.

Subsequent ground motions can reveal other aspects of the slump, including how long it lasts, how far it travels, and the type of terrain over which the material is sliding, the researchers report online today in Science.

A resource for NSF - funded researchers around the nation since 2004, the shake table, based at the University of California, San Diego, can replicate ground motions of most of the world's largest earthquakes.

For instance, when rock falls off a mountainside, the peak is suddenly lighter — so, according to Newton's laws of motion, the mountain springs upward and away from the falling rock, generating initial ground motions that reveal the size of the landslide as well as its direction of travel, Ekström says.

WoldeGabriel coauthored the paper and his role was to characterize the volcanic ash and provide chemistry for local and regional correlation of the ashes sandwiching the fossils from Ethiopia's Chorora area, a region where copious volcanic eruptions and earthquakes entombed fossils recently uplifted via ground motion and erosion.

All the scenario analyses that researchers have done over the years always put very high ground motions under Kathmandu and destroyed it a lot.

In her SSA presentation, Gail Atkinson of Western University will discuss the factors that affect the likelihood of damaging ground motion from fracking - induced earthquakes.

«The way I like to think of it is that I work where seismology and ground motions come in and feed into the infrastructure,» she said.

The hydrophones, which detect pressure waves and convert them into electrical signals, provide less information than the seismometers, which register ground motion, but they can be tethered four miles deep in the water column where the bottom is so far down seismometers would implode as they sank.

After the 2010 Maule earthquake, the country began installing a network of digital broadband seismic and ground motion stations, Global Positioning System stations, and GNSS stations to provide accurate information for tsunami warnings and damage assessment.

The early warning module, called G - FAST, uses ground motion data measured by Global Navigation Satellite Systems (GNSS) to estimate the magnitude and epicenter for large earthquakes — those magnitude 8 and greater.

His research is primarily related to the investigation of the physics of the earthquake source dynamic, near - source ground motion and the implementation of seismology research advancements into Earthquake Engineering knowledge, with the final goal to promote the integration between Earthquake Scientists and Earthquake Engineers.

Improving Dorsal Stream Function in Dyslexics by Training Figure / Ground Motion Discrimination Improves Attention, Reading Fluency, and Working Memory.

Hay is needed as well because it requires more of a side - to - side grinding motion, which prevents points from forming.

That is primarily due to the distance of the faulting (weaker ground motion).