Dome Collapse Block Ash Runout
Translate supplied collapse relief and calibrated Heim-ratio bounds into horizontal-runout scenarios, not probability bounds, a dynamics model or exclusion-zone guidance.
Description
A Heim ratio compares vertical drop with horizontal runout.
A Heim ratio compares vertical drop with horizontal runout. Its calibrated bounds translate relief into runout scenarios.
Translate supplied collapse relief and calibrated Heim-ratio bounds into horizontal-runout scenarios, not probability bounds, a dynamics model or exclusion-zone guidance.
When to use Dome Collapse Block Ash Runout
Use this tool to translate supplied collapse relief and calibrated Heim-ratio bounds into horizontal-runout scenarios, not probability bounds, a dynamics model or exclusion-zone guidance.
Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
How to use Dome Collapse Block Ash Runout and understand its results
- Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
- Enter verticalDropM, callerHeimRatioBounds using the field table and calculation rules, then run the tool.
- Read horizontalRunoutScenarioBoundsM. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| verticalDropM | Vertical drop m | number | Required |
| callerHeimRatioBounds | Caller heim ratio bounds | list of number | Required |
Enter nonnegative relief and two ordered positive H/L ratios. Reverse the ratio endpoints when dividing to produce increasing runout bounds.1
runout bounds = [drop/upper ratio, drop/lower ratio] Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| horizontalRunoutScenarioBoundsM | Horizontal runout scenario bounds m | list of number |
{
"input": {
"verticalDropM": 100,
"callerHeimRatioBounds": [
0.1,
0.2
]
},
"output": {
"horizontalRunoutScenarioBoundsM": [
500,
1000
]
}
}Limitations and assumptions
Empirical scenarios are not probability bounds, a dynamics model or exclusion-zone guidance.
Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Lahar Inundation Distance Volume Scaling: Evaluate caller empirical lahar area-volume bounds and a rectangular mean-width length proxy; no terrain routing, geodesy, inundation map or validated warning distance. For a complementary task, use Ballistic Ejection Max Range: Optimize vacuum ballistic range over launch angle onto a lower horizontal impact plane; distinct from existing fixed-angle/equal-level projectile motion, and aerodynamic drag/terrain or safe distances are not predicted.
References
-
Dome Collapse Block Ash Runout — tool.io
Similar or alternative tools
- Lahar Inundation Distance Volume Scaling
Evaluate caller empirical lahar area-volume bounds and a rectangular mean-width length proxy; no terrain routing, geodesy, inundation map or validated warning distance.
- Ballistic Ejection Max Range
Optimize vacuum ballistic range over launch angle onto a lower horizontal impact plane; distinct from existing fixed-angle/equal-level projectile motion, and aerodynamic drag/terrain or safe distances are not predicted.