What is a high peak ground acceleration?
The change in speed is the acceleration, or how much the velocity changes in a unit time. When the ground is shaking during an earthquake, “it also experiences acceleration. The peak acceleration is the largest increase in velocity recorded by a particular station during an earthquake.” [
What is the largest ground acceleration observed during an earthquake?
The largest peak ground acceleration measured in an earthquake was 4,022 cm/s2. The measurement was recorded by a soil-surface observation site operated by the National Research Institute for Earth Science and Disaster Prevention (Japan) during the Iwate-Miyagi earthquake in northeast Honshu, Japan, on 14 June 2008.
What is creep in regards to a fault?
Slow, more or less continuous movement occurring on faults due to ongoing tectonic deformation. Faults that are creeping do not tend to have large earthquakes.
What is the difference between peak ground acceleration and 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 peak spectral acceleration?
What is aseismic fault slip?
Fault creep is aseismic fault slip that occurs in the uppermost part of the earth’s crust during the time interval between large stress-releasing earthquakes on a fault or as “afterslip” in the days to years following an earthquake.
What is peak horizontal acceleration?
The peak horizontal acceleration (PHA) is the most commonly used type of ground acceleration in engineering applications. It is often used within earthquake engineering (including seismic building codes) and it is commonly plotted on seismic hazard maps.
What is peak ground acceleration?
Peak ground acceleration. Earthquake shaking generally occurs in all three directions. Therefore, PGA is often split into the horizontal and vertical components. Horizontal PGAs are generally larger than those in the vertical direction but this is not always true, especially close to large earthquakes.
What is peak acceleration in earthquake engineering?
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 to calculate peak horizontal ground acceleration (PHA)?
The peak horizontal ground acceleration (PHA or PHGA) can be reached by selecting the higher individual recording, taking the mean of the two values, or calculating a vector sum of the two components. A three-component value can also be reached, by taking the vertical component into consideration also.