Chapter 2 - Earthquake Characteristics Flashcards
What is PGA?
PGA = peak ground acceleration. max recorded ground acceleration of an earthquake at a particular site
What is magnitude?
Magnitude = the absolute size or strength of an earthquake
What is an earthquakes intensity?
intensity is the severity of an earthquake at a certain location
what does magnitude depend on?
it depends on the length and breadth of the fault slip
What does a Richter scale measure?
the strength of an earthquake
What is the moment magnitude scale?
the moment magnitude scale accounts for the area of rupture, energy released, and rigidity of rocks in addition to the amount of slippage along the fault
what bases the intensity of an earthquake?
the damage and the other observed effects on people and structures. varies from place to place within the affected area
what is the attenuation of ground motion?
attenuation is the decrease in ground motion (energy) received at a site with increasing distance from the epicenter
what determines the hazard level of an earthquake?
the probability of exceedance and return period
what is the probability of collapse?
the risk of collapse of a building when subjected to an earthquake or ground shaking that is larger than what we designed for
what needs to be considered when designing resistant earthquake design?
- buildling fragility curve
- hazard curve
what three characteristics can cause seismic damages?
earthquake, site, and structural
