Eruption Duration From DRE Volume

Infer active and elapsed eruption duration from target DRE mass and caller active-rate/duty assumptions; not a next-eruption forecast or duration inferred from column height alone.

Description

Dense-rock-equivalent volume converts to erupted mass through rock density.

Dense-rock-equivalent volume converts to erupted mass through rock density. An active duty fraction separates active eruption time from elapsed time.

Infer active and elapsed eruption duration from target DRE mass and caller active-rate/duty assumptions; not a next-eruption forecast or duration inferred from column height alone.

When to use Eruption Duration From DRE Volume

Use this tool to infer active and elapsed eruption duration from target DRE mass and caller active-rate/duty assumptions; not a next-eruption forecast or duration inferred from column height alone.

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.

How to use Eruption Duration From DRE Volume and understand its results

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
Enter denseRockEquivalentVolumeM3, denseRockDensityKgPerM3, activeMassFluxKgPerSecond, activeDutyFraction using the field table and calculation rules, then run the tool.
Read requiredActiveEruptionSeconds, elapsedScenarioSeconds. 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
denseRockEquivalentVolumeM3	Dense rock equivalent volume m3	number	Required
denseRockDensityKgPerM3	Dense rock density kg per m3	number	Required
activeMassFluxKgPerSecond	Active mass flux kg per second	number	Required
activeDutyFraction	Active duty fraction	number	Required

Use positive density, flux and duty in (0,1], with nonnegative DRE volume. Return active and elapsed seconds separately.^[1]

active seconds = DRE volume × density/active mass flux; elapsed seconds = active seconds/duty

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
requiredActiveEruptionSeconds	Required active eruption seconds	number
elapsedScenarioSeconds	Elapsed scenario seconds	number

json

{
  "input": {
    "denseRockEquivalentVolumeM3": 100,
    "denseRockDensityKgPerM3": 10,
    "activeMassFluxKgPerSecond": 100,
    "activeDutyFraction": 0.5
  },
  "output": {
    "requiredActiveEruptionSeconds": 10,
    "elapsedScenarioSeconds": 20
  }
}

Limitations and assumptions

Rate and duty are assumed; neither a next-event forecast nor column-height-only duration is supplied.

Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Mass Eruption Rate From Column Height: Invert a supplied column-height calibration and height measurement bounds into mass-rate scenarios; bounds exclude model uncertainty and are not probabilistic confidence intervals. For a complementary task, use Lava Flow Volume Effusion Duration: Integrate piecewise dense-magma discharge into DRE and separately expanded emplaced bulk lava volume; unlike survey-rate inference, flow is a supplied forward boundary condition.

References

Eruption Duration From DRE Volume — tool.io

Similar or alternative tools

Mass Eruption Rate From Column Height
Invert a supplied column-height calibration and height measurement bounds into mass-rate scenarios; bounds exclude model uncertainty and are not probabilistic confidence intervals.
Lava Flow Volume Effusion Duration
Integrate piecewise dense-magma discharge into DRE and separately expanded emplaced bulk lava volume; unlike survey-rate inference, flow is a supplied forward boundary condition.