Joyner Boore 1981 Intensity Model

Class Name

• RJoynerBoore1981IntensityModel

Location in Objects Pane

• Models > Model > Hazard > Earthquake > Intensity > Joyner Boore 1981 Intensity

Model Description

Model Form

• This model produces the peak ground acceleration at specified locations for given magnitude and hypocentre location input, based on the Joyner and Boore (1981) attenuation relation.
$$PGA = {10^{ - 1.02\alpha + 0.249\beta \cdot M - {{\log }_{10}}(R) + b \cdot R + 0.26\varepsilon }}$$ where \({R}\)= radius
• For more information, see Joyner and Boore (1981).

DDM Sensitivities

• Yes

Properties

Object Name

• Name of the object in Rt
• Allowable characters are upper-case and lower-case letters, numbers, and underscore (“_”).
• The name is unique and case-sensitive.

Display Output

• Determines whether the model is allowed to print messages to the Output Pane.

Magnitude

• \({M}\) = Magnitude

Alpha

• \({\alpha}\) = 1, typically a normal random variable with unit mean.

Beta

• \({\beta}\) = 1, typically a normal random variable with unit mean.

B

• B = 1, typically a normal random variable with unit mean.

Epsilon

• \({\varepsilon}\) = Model error, typically a standard normal random variable

Hypocentre Location

• Location of the hypocenter, which automatically will yield the radius \({R}\) to the various output locations.

Structure Location List

• List of the locations where the intensity will be computed at them (the output will give as many intensity values as the locations provided here).

Output

• \({PGA}\) = peak ground accelerations (as many as the locations provided in the input)
• The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.

Right-click Menu

Remove

• Removes the object.

References

• Boore, D. M., & Joyner, W. B. (1982). The empirical prediction of ground motion. Bulletin of the Seismological Society of America, 72(6B), S43-S60