What are ground motion parameters?
In time-domain, the fundamental ground motion parameters are peak ground acceleration (PGA), peak ground velocity (PGV) and peak ground displacement (PGD). Attenuation relationships are commonly implemented to investigate the major ground motion parameters in the seismic hazard analysis.
What ground motion parameter is selected to characterize the strong ground motion that causes the landslide?
The most widely used parameter in strong-motion studies is the peak ground acceleration (PGA). Since accelerograms are triaxial records of the ground motion, the definition of PGA depends on how the two horizontal components are handled.
How do you scale ground motion?
GROUND MOTION SCALING METHODS It involves amplitude scaling a pair of seed motions by a single scaling factor to minimize the sum of the squared errors between the target spectral values and the geometric mean (square root of the product) of the spectral ordinates for the pair.
Why do we scale ground motion?
Scaling of ground motion adjusts a real accelerogram such that it tends to have a good match with a target spectrum. Ground motions chosen herein are scaled separately to UHS and CMS considering a period range of 0.2–1.5T [3] where T is the fundamental period of the structure selected as 0.2 s, 1.0 s and 3.0 s.
What are the factors influences the ground motion?
In particular, the influence of the fault distribution, rather than the epicentral distance or the hypocentral distance, was so significant that it controlled the strong ground motion characteristics of the earthquake; the rupture directivity effect obviously strengthened the shaking in the direction of rupture; and …
What is the ground motion of an earthquake?
Ground motion is the movement of the earth’s surface from earthquakes or explosions. Ground motion is produced by waves that are generated by sudden slip on a fault or sudden pressure at the explosive source and travel through the earth and along its surface. A recording of ground motion.
How are magnitude and intensity related?
Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs. Intensity measures the strength of shaking produced by the earthquake at a certain location. Intensity is determined from effects on people, human structures, and the natural environment.
Why El Centro earthquake is important?
It was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture. It was the strongest recorded earthquake to hit the Imperial Valley, and caused widespread damage to irrigation systems and led to the deaths of nine people.
What is the difference between static and dynamic analysis?
24 Jan 2020 Static vs Dynamic Analysis A static analysis can only be performed if the system being simulated does not depend on time, and if the loads being applied are constant. In a dynamic analysis, the system itself, the load application, or both might change with time.
What are the characteristics of strong ground motion?
The characteristics of strong ground motion Introduction. In earthquakes the motion of any particle of the ground follows in general a complex three-dimensional path having rapidly changing accelerations, velocities, and displacements and a broad band of frequency content.
How are strong ground motions measured in an earthquake?
Strong ground motions are measured by accelerographs and expressed in the form of accelerograms. Shahram Pezeshk Title goes here 2 Location and Intensity of Earthquake seismographic stations around the World work together to record earthquake location determine earthquake strength Modern Seismograph (Horizontal)
How is the duration of strong motion defined?
Duration of strong motion is usually defined in relation to ground accelerations, and many difference definitions exist. A comprehensive definition of a predictive model for duration of strong motion should incorporate (at least) the influence of earthquake magnitude, travel path (attenuation) and site ground class.
Why is the frequency content of ground motion important?
The frequency content describes how the amplitude of ground motion is distributed among different frequencies. Since the frequency content of an earthquake motion will strongly influence the effect of that motion, characterization of the motion cannot be complete without consideration for frequency content.