What is effective peak ground acceleration?
Effective Peak Ground Acceleration. In terms of structural response, it corresponds to the peak value of the absolute acceleration of a single degree of freedom (SDOF) system with infinite stiffness, that is, with a natural period of vibration equal to zero.
What is spectral acceleration in earthquake?
Spectral acceleration (SA) is a unit measured in g (the acceleration due to Earth’s gravity, equivalent to g-force) that describes the maximum acceleration in an earthquake on an object – specifically a damped, harmonic oscillator moving in one physical dimension.
What is FRF measurement?
The most common transfer function measurement is the FRF, or frequency response function. To measure the frequency response of a mechanical system, one must measure the spectra of both the input force to the system and the vibration response.
What is maximum considered earthquake?
The Indian seismic code defined peak ground acceleration (PGA) for the Maximum Considered Earthquake (MCE) is 0.36 g and the Design Basis Earthquake (DBE) is 0.18 g for service life of structure, for the highest seismicity area, Zone V.
What are the magnitude of earthquakes?
Earthquake Magnitude Scale
| Magnitude | Earthquake Effects |
|---|---|
| 2.5 or less | Usually not felt, but can be recorded by seismograph. |
| 2.5 to 5.4 | Often felt, but only causes minor damage. |
| 5.5 to 6.0 | Slight damage to buildings and other structures. |
| 6.1 to 6.9 | May cause a lot of damage in very populated areas. |
What is SS in earthquake?
Their values represent a ground acceleration at the site as a percentage of gravity. One is called the short period (0.2 sec) acceleration Ss and the other the 1-second period acceleration S1.
How is peak acceleration related to spectral acceleration?
PGA (peak acceleration) is what is experienced by a particle on the ground. SA (spectral acceleration) is approximately what is experienced by a building, as modeled by a particle on a massless vertical rod having the same natural period of vibration as the building.
What is the peak ground acceleration for Zone V?
How is peak ground acceleration used in earthquake?
Peak ground acceleration. It is often used within earthquake engineering (including seismic building codes) and it is commonly plotted on seismic hazard maps. In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself.
How is the moment related to the magnitude of an earthquake?
Moment (MO) = rigidity x area x slip where rigidity is the strength of the rock along the fault, area is the area of the fault that slipped, and slip is the distance the fault moved. Thus, stronger rock material, or a larger area, or more movement in an earthquake will all contribute to produce a larger magnitude.
What does peak ground acceleration ( PGA ) stand for?
From Wikipedia, the free encyclopedia Peak Ground Acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake.
How are magnitude, energy release, and shaking intensity related?
Earthquake magnitude, energy release, and shaking intensity are all related measurements of an earthquake that are often confused with one another. Their dependencies and relationships can be complicated, and even one of these concepts alone can be confusing.