Tephra2 Inversion Tool

Input Parameters

Input your list of field sample locations (3 numbers per line, separated by a space)

Easting (UTM) Northing (UTM) Mass-loading (per unit area)

Example: 4000 126000 417.2 (m m kg m^-2)

Input your list of wind measurements above vent (3 numbers per line, each separated by a space)

Elevation Wind-speed Down-wind_direction-from-N

Example: 4000 20 90 (m m s^-1 deg-from-N)

Set the Vent Location (easting northing elevation)

Vent Easting (UTM)

Range: [200000..800000] (m)

Vent Northing (UTM)

Range: [0..10000000] (m)

Vent Elevation (masl)

Range: [0..10000] (m)

Set the Elevation of the simulation grid (simulation will deposit tephra at this constant level)

Elevation (masl)

Range: [0..10000] (m)

Set a range for the total Eruption Mass (units=kg)

Minimun Mass

      1e9 kg
small volume

1e15 kg
large volume

1e9

Maximum Mass

      1e9 kg
small volume

15 kg
large volume

1e15

Set a range for the Plume Height above the vent (units changed to m)

minimum Height

        0 km
short plume

40 km
tall plume

15000

maximum Height

        0 km
short plume

40 km
tall plume

15000

Define a Beta Distribution for the release of particles from the plume

Set a range for Alpha

minimun Alpha

1.0

maximum Alpha

1.0

Set a range for Beta

minimun Beta

1.0

maximum Beta

1.0

Define the grainsize distribution of pyroclastic ejecta

Set the Minimum Grain Size (units = phi)

      1 mm
Coarse ash

0.001 mm
Fine-ash

4.0

Set the Maximum Grain Size (units = phi)

         51 mm
Coarse lapilli

1 mm
Coarse-ash

-4.0

Set a range for the Median Grain Size (units = phi)

minimum Median

  -8.0
coarse

8.0
fine

maximum Median

  -8.0
coarse

8.0
fine

Set a range for the Standard Deviation (sigma) in grain size (units = phi)

minimum Sigma

    0
small

4
large

0.5

maximum Sigma

    0
small

4
large

0.5

Set a range for the Diffusion Coefficient for coarse particles (units = m² s^-1)

minumim Diffusion

        0
low plume
spread

1e9
high plume
spread

1e1

maximum Diffusion

        0
low plume
spread

1e9
high plume
spread

1e1

Set a range for the Fall Time Threshold for the change in diffusion (units = sec)

minimum Threshold

      1
(short)

1e9
(long)

1e1

maximum Threshold

      1
(short)

1e9
(long)

1e1

Set a range for the Eddy Diffusion constant for fine particles (units = m² s^-1)

minimum Diffusion

low      0
atmosphere
turbulence

1     high
atmosphere
turbulence

0.04

maximum Diffusion

low      0
atmosphere
turbulence

1     high
atmosphere
turbulence

0.04

Specify a density model for pyroclasts

Density of Lithic particles (units = kg m^-3)

2700

Density of Pumice particles (units = kg m^-3)

1000

Specify integration steps

Number of Column Steps

     50
shorter
runtime

200
longer
runtime

200

Number of Particle Steps

     50
shorter
runtime

100
longer
runtime

100

Specify the goodness-of-fit test

Chi-square

RMSE (Root Mean Squared Error)

Log-test

Please be patient. Code execution may take up to 10 minutes depending on the scale of your submission. You will be notified when your run has completed.

Input Parameters

Define a Beta Distribution for the release of particles from the plume Help

Beta Function

Define the grainsize distribution of pyroclastic ejecta

Specify a density model for pyroclasts

Specify integration steps

Specify the goodness-of-fit test

Input Validation

Define a Beta Distribution for the release of particles from the plume