# Bounded Exponential Magnitude Model

## Class Name

• RBoundedExponentialMagnitudeModel

## Location in Objects Pane

• Models > Model > Hazard > Earthquake > Magnitude > Bounded Exponential Magnitude

## Model Description

### Model Form

• The basis for this model is the following PDF:
• $$f(m) = {{\beta \cdot \exp \left[ { - \beta \cdot (m - {M_{\min }})} \right]} \over {1 - \exp \left[ { - \beta \cdot ({M_{\max }} - {M_{\min }})} \right]}} \text{ for }{M_{\min }} \le m \le {M_{\max }}$$ where $${\beta}$$ is the model parameter that depends on the relative frequency of different magnitudes.
• In order to obtain the outcome of $$m$$, a standard normal random variable, $${\theta}$$, is given to the model, and transformed according to the probability-preserving transformation $$F(m)={\Phi}({\theta})$$, where $$F(m)$$ is the CDF corresponding to the given PDF.
• $$m=-\frac{1}{\beta}\ln \left[ 1-\Phi (\theta )\cdot \left( 1-\exp \left( -{\beta}\left( {{M}_{\max }}-{{M}_{\min }} \right) \right) \right) \right]+{{M}_{\min }}$$
• For further information on this model, refer to Rahimi, H., Mahsuli, M. (2019) and Mahsuli, M., Rahimi, H., Bakhshi, A. (2019).

• 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.

### Minimum Magnitude

• $${M _{\min}}$$ = Magnitude Lower bound

### Maximum Magnitude

• $${M _ {\max}}$$ = Magnitude upper bound

### Beta

• $${\beta}$$ = Model parameter, usually in the range of 1 to 2

### Theta

• $${\theta}$$ = A standard-normal random variable

## Output

• $$m$$ = Magnitude
• The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.