# Moment Magnitude Model

## Class Name

## Location in Objects Pane

- Models > Model > Hazard > Earthquake > Magnitude > Moment Magnitude

## Model Description

### Model Form

$$M = {\vartheta _1} \cdot {\log _{10}}(G \cdot A \cdot D \cdot {10^7}) - {\vartheta _2} + \varepsilon $$
where \({G}\)∙\({A}\)∙\({D}\)∙\({10^7}\) = seismic moment

### 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.

### Shear Modulus

- \({G}\) = Shear modulus which is typically set as 30.109 N/m
^{2}

### Rupture Area

- \({A}\) = Rupture area in m
^{2}

### Rupture Displacement

- \({D}\) = Rupture displacement in m

### Theta1

- \({\vartheta _ 1}\) = Model parameter which is typically set as 2/3.

### Theta2

- \({\vartheta _ 2}\) = Model parameter which is typically set as 10.7.

### Epsilon

- \({\varepsilon}\) = Model error

## Output

- \({M}\) = Magnitude
- The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.

## Right-click Menu

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