Physics For Civil Engineering: Unit V: Natural Disasters
Probabilistic Seismic Hazard Analysis (PSHA)
Four Steps
Probabilistic Seismic Hazard Analysis (PSHA) provides a framework in which the uncertainties can be identified.
PROBABILISTIC SEISMIC HAZARD ANALYSIS
(PSHA)
Probabilistic
Seismic Hazard Analysis (PSHA) provides a framework in which the uncertainties
can be identified. Further, they are quantified, and combined in a rational
manner to provide a more complex picture of the seismic hazard.
Four
Steps in PSHA
The
probabilistic seismic hazard analysis (PSHA) requires the following four steps.
1.
Identification and characterization of earthquake sources.
2. Characterisation of temporal distribution of earthquake recurrence.
3. Determination
of grand motion.
4.
Computation of probability of earthquake.
1. Identification and characteristics of earthquake sources
The probability distribution of potential
rupture locations within the source must also be characterized.
In
most cases, uniform probability distributions are assigned to each source zone,
implying that earthquakes are equally likely to occur at any point within the
source zone.
These
distributions are then combined with the source geometry to obtain the
corresponding probability distribution of source-to-site distance.
2. Characteristics of temporal distribution of earthquake
recurrence
Next, the seismicity or temporal
distribution of earthquake recurrence must be
The
recurrence relationship may accommodate the maximum size earthquake. But it
does not limit consideration to that earthquake.
3. Determination of ground motion
The
ground motion produced at the site by earthquake in each source zone must be
determined with the use of predictive relationships.
4. Computation of probability of earthquake
Finally,
the uncertainties in earthquake location, earthquake size, and ground motion
parameter prediction are combined to obtain the probability and to the
mechanics of the probability computations (Fig. 5.8).
Physics For Civil Engineering: Unit V: Natural Disasters : Tag: : Four Steps - Probabilistic Seismic Hazard Analysis (PSHA)
Physics For Civil Engineering: Unit V: Natural Disasters
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Physics for Civil Engineering
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