Seismic Hazard Forecasting
... It also accounts for attenuation of ground motion with distance from the seismic source The authors use a peak ground acceleration (PGA) of 0.2 g (≈ (≈ 1.96 m/s2) as a baseline The probability of PGA at a given site exceeding 0.2 g is related to the annual seismicity rates, earthquake magnitudes, an ...
... It also accounts for attenuation of ground motion with distance from the seismic source The authors use a peak ground acceleration (PGA) of 0.2 g (≈ (≈ 1.96 m/s2) as a baseline The probability of PGA at a given site exceeding 0.2 g is related to the annual seismicity rates, earthquake magnitudes, an ...
Introduction to Seismology: The wave equation and body waves
... chip libraries, and eventually to modern digital seismic networks and data centers. This data-sharing tradition is a very appealing part of being a seismologist. It’s easy for any of us to obtain an abundance of data. All you have to do is go online to the appropriate data center (SCECDC for souther ...
... chip libraries, and eventually to modern digital seismic networks and data centers. This data-sharing tradition is a very appealing part of being a seismologist. It’s easy for any of us to obtain an abundance of data. All you have to do is go online to the appropriate data center (SCECDC for souther ...
Waves, Waves, Waves!
... Slowest of the seismic waves (travel at around 3 km/s) Produced by the interaction of P- and S-waves at the Earth’s surface Can be used to characterize the Earth’s interior and oil deposits ...
... Slowest of the seismic waves (travel at around 3 km/s) Produced by the interaction of P- and S-waves at the Earth’s surface Can be used to characterize the Earth’s interior and oil deposits ...
Tu P05 15 Identification and Elimination of Surface
... in SI by cross-correlation. The blue boxes denote receivers at positions xA and xB. The red dashed line represents a source boundary. The white stars indicate sources at stationary points. The red stars denote active sources at stationary points SS1 and SS2. Having sources only at the surface does n ...
... in SI by cross-correlation. The blue boxes denote receivers at positions xA and xB. The red dashed line represents a source boundary. The white stars indicate sources at stationary points. The red stars denote active sources at stationary points SS1 and SS2. Having sources only at the surface does n ...
psha using different attenuation relationships for different
... continental transform fault between the Indian and Sunda plates. The Shagaing fault, which is more than 1000 km long, is an active right lateral strike slip fault crossing from north to south through Myanmar. The fault extends from north of Lake Indawgyi southward along the Irrawaddy River north of ...
... continental transform fault between the Indian and Sunda plates. The Shagaing fault, which is more than 1000 km long, is an active right lateral strike slip fault crossing from north to south through Myanmar. The fault extends from north of Lake Indawgyi southward along the Irrawaddy River north of ...
Seismic reflection profiling in the Proterozoic Arunta Block, central
... sections. We therefore investigated a number of different stacking procedures to generate a working section with minimum processing artifacts, and in a form suitable for migration. All processing was done using pseudo true-amplitude techniques. Although the processed seismic reflection section did n ...
... sections. We therefore investigated a number of different stacking procedures to generate a working section with minimum processing artifacts, and in a form suitable for migration. All processing was done using pseudo true-amplitude techniques. Although the processed seismic reflection section did n ...
Earthquake Recording Station
... A. Look at the upper right corner of the seismogram. At what time did the P wave hit? ___________________________________________________________________ B. What is shown on the seismogram at this time? _____________________________ 2. Observe: Click Play, and then click Pause after the green S wave ...
... A. Look at the upper right corner of the seismogram. At what time did the P wave hit? ___________________________________________________________________ B. What is shown on the seismogram at this time? _____________________________ 2. Observe: Click Play, and then click Pause after the green S wave ...
Student Exploration: Earthquake – Recording Station
... A. Look at the upper right corner of the seismogram. At what time did the P wave hit? ___________________________________________________________________ B. What is shown on the seismogram at this time? _____________________________ 2. Observe: Click Play, and then click Pause after the green S wave ...
... A. Look at the upper right corner of the seismogram. At what time did the P wave hit? ___________________________________________________________________ B. What is shown on the seismogram at this time? _____________________________ 2. Observe: Click Play, and then click Pause after the green S wave ...
File
... • Fire – Ruptured gas lines from earthquakes is one of the major hazards. • Ground shaking versus material type – More ground shaking occurs in poorly consolidated (loose) sediments than solid bedrock. ...
... • Fire – Ruptured gas lines from earthquakes is one of the major hazards. • Ground shaking versus material type – More ground shaking occurs in poorly consolidated (loose) sediments than solid bedrock. ...
topic #10 - earthquakes and tsunamis
... • These waves travel slower than swaves and are formed as p- and swave energy hits the surface. ...
... • These waves travel slower than swaves and are formed as p- and swave energy hits the surface. ...
earthquake - WordPress.com
... The first kind of body wave is the P wave or primary wave. This is the fastest kind of seismic wave. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air. ...
... The first kind of body wave is the P wave or primary wave. This is the fastest kind of seismic wave. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air. ...
IODP Expedition 340T: Borehole Logging at Atlantis Massif Oceanic
... zone at 1080–1220 mbsf is sufficient that, if laterally extensive, would be detectable within regional, far-field seismic data. Compressional velocities are 0.5–1 km s -1 lower than the surrounding rock. Similarly, the olivine-rich troctolite interval at 310–350 mbsf has velocity notably lower than ...
... zone at 1080–1220 mbsf is sufficient that, if laterally extensive, would be detectable within regional, far-field seismic data. Compressional velocities are 0.5–1 km s -1 lower than the surrounding rock. Similarly, the olivine-rich troctolite interval at 310–350 mbsf has velocity notably lower than ...
Laboratory determination of velocity anisotropy
... dominant crack plane and slowest perpendicular to this orientation. Also, the shear wave velocities will vary with azimuth, because polarized shear waves will encounter the crack array in all orientations. The Rock Physics Laboratory has developed a Velocity Anisotropy Measurement System that can ma ...
... dominant crack plane and slowest perpendicular to this orientation. Also, the shear wave velocities will vary with azimuth, because polarized shear waves will encounter the crack array in all orientations. The Rock Physics Laboratory has developed a Velocity Anisotropy Measurement System that can ma ...
Earthquakes
... – Roman numerals I to XII describes damage done by the quake – XII : total destruction – An earthquake with one magnitude, damage can vary depending on the location ...
... – Roman numerals I to XII describes damage done by the quake – XII : total destruction – An earthquake with one magnitude, damage can vary depending on the location ...
Earthquakes
... • Accurate and consistent short-term earthquake prediction not yet possible, three methods assist in determining probability that an earthquake will occur: – Measurement of changes in rock properties, such as magnetism, electrical resistivity, seismic velocity, and porosity, which may serve as precu ...
... • Accurate and consistent short-term earthquake prediction not yet possible, three methods assist in determining probability that an earthquake will occur: – Measurement of changes in rock properties, such as magnetism, electrical resistivity, seismic velocity, and porosity, which may serve as precu ...
Simulation of seismic waves at the earth`s crust (brittle–ductile
... at supercritical conditions (Albertsson et al., 2003). The temperature dependence is expressed by the Arrhenius steadystate power law, e.g., Eq. (15) in Carcione and Poletto (2013). We use realistic Arrhenius constants A = 1030 MPa−n s−1 , n = 3.5 and activation energy E = 990 kJ/mol for the rheolog ...
... at supercritical conditions (Albertsson et al., 2003). The temperature dependence is expressed by the Arrhenius steadystate power law, e.g., Eq. (15) in Carcione and Poletto (2013). We use realistic Arrhenius constants A = 1030 MPa−n s−1 , n = 3.5 and activation energy E = 990 kJ/mol for the rheolog ...
S05_4359_L04
... stations on 6 continents by 1900. Richard Oldham (~1900) distinguished P & S waves. Seismograms record ground motion at a specific location (in 3 directions: X-Y-Z). [Greek, seismos=earthquake]. The Earth is constantly undergoing and responding to Stresspressure=force per unit area (compressional, ...
... stations on 6 continents by 1900. Richard Oldham (~1900) distinguished P & S waves. Seismograms record ground motion at a specific location (in 3 directions: X-Y-Z). [Greek, seismos=earthquake]. The Earth is constantly undergoing and responding to Stresspressure=force per unit area (compressional, ...
Fault reactivation due to the M7.6 Nicoya earthquake at the
... Rica: Effects of dynamic stress triggering, Geophys. Res. Lett., 41, 4142–4148, doi:10.1002/2014GL059942. ...
... Rica: Effects of dynamic stress triggering, Geophys. Res. Lett., 41, 4142–4148, doi:10.1002/2014GL059942. ...
Seismic evidence for a chemical heterogeneity in the midmantle: A
... seismograms recorded by a short-period seismometer network in Japan (J-array) from a cluster of deep earthquakes that occurred at the northern Mariana subduction zone. This phase (1) shows a P wave particle motion, (2) arrives later from earthquakes with shallower focal depths, (3) has a steeper inc ...
... seismograms recorded by a short-period seismometer network in Japan (J-array) from a cluster of deep earthquakes that occurred at the northern Mariana subduction zone. This phase (1) shows a P wave particle motion, (2) arrives later from earthquakes with shallower focal depths, (3) has a steeper inc ...
Porosity prediction using attributes from 3C–3D seismic data
... Multi-regression analysis and neural networks can be successfully used to predict log properties from seismic attributes. Both P-P and P-S information is useful in log prediction as evidenced by the type of the optimal attributes. In the present example, the predicted logs showed high correlation of ...
... Multi-regression analysis and neural networks can be successfully used to predict log properties from seismic attributes. Both P-P and P-S information is useful in log prediction as evidenced by the type of the optimal attributes. In the present example, the predicted logs showed high correlation of ...
PreMDB, a thermodynamically consistent material
... Material properties are essential to realistic simulations of geodynamic and geological processes. These properties generally derive from laboratory experiments and geophysical observations [3, 5, 6, 12, 13, 22, 23, 29, 36, 43, 46]. Additionally, numerical data calculated from thermodynamic potentia ...
... Material properties are essential to realistic simulations of geodynamic and geological processes. These properties generally derive from laboratory experiments and geophysical observations [3, 5, 6, 12, 13, 22, 23, 29, 36, 43, 46]. Additionally, numerical data calculated from thermodynamic potentia ...
2016_Meghraoui-al_Seismotectonic of Africa
... on a geological, geophysical and geodetic database including instrumental seismicity and re-appraisal of large historical events, and harmonization and homogenization of earthquake parameters in the catalogues. Although establishing the seismotectonic framework of the African continent is a difficul ...
... on a geological, geophysical and geodetic database including instrumental seismicity and re-appraisal of large historical events, and harmonization and homogenization of earthquake parameters in the catalogues. Although establishing the seismotectonic framework of the African continent is a difficul ...
A New, Fully Integrated Method for Seismic
... genuine ambiguity between the velocity and the anisotropic parameters, for example Thomsen’s and in a transversely isotropic medium. Other information such as geology and offset well data are needed to overcome the ambiguity. Zdraveva et al. (2011) show how this additional information is incorporate ...
... genuine ambiguity between the velocity and the anisotropic parameters, for example Thomsen’s and in a transversely isotropic medium. Other information such as geology and offset well data are needed to overcome the ambiguity. Zdraveva et al. (2011) show how this additional information is incorporate ...
performance based analysis and modeling of a dual seismic force
... and architect-defined constraints. The design of seismic-resistant EBFs is based on the concept that, during an extreme earthquake event, yielding and damage to the structure must be limited primarily to the link beams, which will deform inelastically with significant ductility and energy dissipatio ...
... and architect-defined constraints. The design of seismic-resistant EBFs is based on the concept that, during an extreme earthquake event, yielding and damage to the structure must be limited primarily to the link beams, which will deform inelastically with significant ductility and energy dissipatio ...
Reflection seismology
Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves. The method requires a controlled seismic source of energy, such as dynamite/Tovex, a specialized air gun or a seismic vibrator, commonly known by the trademark name Vibroseis. Reflection seismology is similar to sonar and echolocation. This article is about surface seismic surveys; for vertical seismic profiles, see VSP.