Geology Seismic Stress Drop Calculator
Circular crack7M0/(16r³) from independent rupture radius, not moment-magnitude conversion or forecast. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
An idealized circular rupture model relates seismic moment and rupture radius to a stress-drop estimate.
An idealized circular rupture model relates seismic moment and rupture radius to a stress-drop estimate.1
Because radius enters cubed, geometric uncertainty strongly affects the inferred stress in pascals. Use this tool to calculate seismic stress drop from the supplied measurements and assumptions.
When to use Geology Seismic Stress Drop Calculator
Use this tool to calculate seismic stress drop from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Seismic Stress Drop Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter seismicMomentNM, independentCircularRuptureRadiusM, using the field meanings and rules below, then run the tool.
- Read bruneCircularStressDropPa. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| seismicMomentNM | Seismic moment n m | number | Required |
| independentCircularRuptureRadiusM | Independent circular rupture radius m | number | Required |
Require nonnegative moment in newton-meters and positive circular rupture radius in meters. Apply the fixed circular stress-drop relation and return pascals; zero moment gives zero. The tool does not estimate rupture radius or fit a source spectrum.
stressDropPa=7×seismicMomentNM/(16×radiusM³) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| bruneCircularStressDropPa | Brune Circular Stress Drop Pa; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"seismicMomentNM": 16,
"independentCircularRuptureRadiusM": 1
},
"output": {
"bruneCircularStressDropPa": 7
}
}Limitations and assumptions
Because radius enters cubed, geometric uncertainty strongly affects the inferred stress in pascals. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Geomechanics Mohr Coulomb Cohesion From Hoek Brown Calculator for this related task: An equivalent Mohr–Coulomb envelope can be fitted over a selected confining-stress interval.
Use Geology Geomechanics Landslide Factor Of Safety Janbu Calculator when its separate inputs and assumptions fit the question: A Janbu simplified analysis balances forces for independently specified slices of a potential slip mass.
References
-
Geology Seismic Stress Drop Calculator — tool.io
Similar or alternative tools
- Geology Geomechanics Mohr Coulomb Cohesion From Hoek Brown Calculator
An equivalent Mohr–Coulomb envelope can be fitted over a selected confining-stress interval.
- Geology Geomechanics Landslide Factor Of Safety Janbu Calculator
A Janbu simplified analysis balances forces for independently specified slices of a potential slip mass.