Idriss 2013 Intensity Model

Class Name

• RIdriss2013IntensityModel

Location in Objects Pane

• Models > Model > Hazard > Earthquake > Intensity > Idriss 2013 Intensity

Model Description

Model Form

• This model produces the spectral acceleration or peak ground acceleration at specified locations for given magnitude and hypocenter location of several earthquake sources as input, based on the Idriss (2014) attenuation relation.
• Depth to the top of rupture is calculated based on formulas used in Baker's implementation of Idriss (2014) attenuation relation, if it is unknown.
• In case of unkown parameters, you can enter the unknown-identifier (e.g. 999 in some fields) once for all inputs in each field, assuming all inputs of that field are unkown.
• For more information, see Idriss (2014) and Baker research group implementation of Idriss (2014).

DDM Sensitivities

• No

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 List

• Magnitudes of various earthquake sources

Depth To Top Of Rupture List

• Depth to top of rupture of various earthquake sources (Use 999 in case of unknown)

Rupture Distance List

• Closest distance from rupture plane of various earthquake sources (Use 999 in case of unknown. In this case, it is calculated based on Pythagorean theorem using the depth of top edge of rupture and hypocenter location distance)

Hypocentre Location List

• Hypocenter locations of earthquake sources, which automatically will yield the radius \({R}\) to the various output locations

Epsilon Uncertainty List

• Model error, typically a standard normal random variable; this model does not distinguish between inter- and intra-event model residuals

Fault Types

• Fault mechanism that can either be Unspecified, Normal-slip, Strike-slip, or Reverse-slip.

Response Type

• Type of the response than can be either \({S_a}\), \({PGA}\), or \({PGV}\).

Period List

• List of the natural periods at which the intensity is evaluated

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)

Shear Wave Velocity List

• List of the shear wave velocities at the specified locations

Output

• Earthquake intensities (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

• Idriss, I. M. (2014).An NGA-West2 Empirical Model for Estimating the Horizontal Spectral Values Generated by Shallow Crustal Earthquakes. Earthquake Spectra, 30(3), 1155–1177.
• Baker, J. W. (n.d.). Ground motion prediction equation functions. Retrieved October 06, 2016, from https://web.stanford.edu/~bakerjw/GMPEs.html