# Atkinson 1997 Intensity Model

## Class Name

- RAtkinson1997IntensityModel

## Location in Objects Pane

- Models > Model > Hazard > Earthquake > Intensity > Atkinson 1997 Intensity

## Model Description

### Model Form

- This model produces the spectral acceleration or the peak ground acceleration at specified locations for given magnitude and hypocenter location of several earthquake sources as input, based on the Atkinson-Boore (1997) attenuation relation.
- For more information, see Boore-Atkinson (1997)

### DDM Sensitivities

## 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.

### Period Parameter List

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

### Magnitude

- Magnitudes of various earthquake sources

### Hypocentre Location

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

### Soil Type

- The type of soil that can be "Rock" or "FirmSoil"

### Epsilon

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

### 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)

### C 0 Uncertainty

- The coefficient of quadratic equations that approximate the estimates for the purpose of seismic hazard calculations.

### C 1 Uncertainty

- The coefficient of quadratic equations that approximate the estimates for the purpose of seismic hazard calculations.

### C 2 Uncertainty

- The coefficient of quadratic equations that approximate the estimates for the purpose of seismic hazard calculations.

### C 3 Uncertainty

- The coefficient of quadratic equations that approximate the estimates for the purpose of seismic hazard calculations.

### C a3 Uncertainty

- Correction factor based on empirical analysis results

### C a4 Uncertainty

- Correction factor based on empirical analysis results

### Csigma Uncertainty

- The standard deviation of model error

### Cs Uncertainty

## 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”.

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## References

- Atkinson, G. M., & Boore, D. M. (1997). Stochastic point-source modeling of ground motions in the Cascadia region. Seismological Research Letters, 68(1), 74–85