gnsthreat

GNS Science threat model database simulation plugin

Description

The simgnsthreat simulation plugin reads precalculated simulation data from threat level files in CSV format and provides them via the tsunami plugin interface.

Matching between incident and precomputed scenarios is done based on magnitude (plus/minus matching.magnitudeUncertainty) and search area. First, scenarios are searched for in an elliptical area whose orientation and size corresponds to fault geometry. If less than gnsthreat.matching.maxScenarios are found, then the search is continued in a circular area with radius as configured in gnsthreat.matching.fallbackSearchRadius and the additionally found sceanrios are appended.

Ellipse orientation, Fallback search radius and Magnitude uncertainty can be adapted in the interactive simulation dialog.

If more than maxScenarios are found, they are sorted and the first maxScenarios are returned. Sorting is done as follows: first by distance, then by magnitude difference (for same magnitude difference larger magnitude first). Note: this sorting has not to be confounded with the sorting as shown in the TOAST Database - Simulations panel, where sorting can be done according to Residual with configurable weighting parameters (see TOAST Configuration Parameters).

Threat level files

Threat level files store simulation results. The plugin supports the following file types:

  • Time of arrival of the minimum detectable positive amplitude wave (T1 - 1cm)

  • Time of first exceedance of the threat level threshold (T2 - 30 cm)

  • Maximum positive wave amplitude at shoreline (Runup)

Structure

Threat level files are stored in CSV format. The fist lines of a file contain the following meta information:

  • Scenario ID

  • Code

  • Lon

  • Lat

  • Mag

  • Slip

From there on each line contains the results for a particular forecast zone, starting with the forecast zone ID (1-43) followed by the values for the different scenarios. Unset values are represented as NAN.

Configuration

In order to be loaded by TOAST, the simgnsthreat plugin has to be added either in the global module configuration (global.cfg) or in the global section of the toast module (toast.cfg).

plugins = ${plugins},simgnsthreat

Threat level files

Configuration of the 1 cm threat level file

# File in CSV format from which the tmin1cm values are read.
gnsthreat.files.min1cm = @DATADIR@/csv/Header_Tmin_1cmThreatLevel.csv

Configuration of the 30 cm threat level file

# File in CSV format from which the tmin30cm values are read.
gnsthreat.files.min30cm = @DATADIR@/csv/Header_Tmin_30cmThreatLevel.csv

Configuration of the runup threat level file

# File in CSV format from which the hpct99 values are read.
gnsthreat.files.hpct99 = @DATADIR@/csv/Header_Hpct99ThreatLevel.csv

Forecast points

Forecast point profiles can be registered as follows:

# Registration of forecast points.
gnsthreat.forecastPoints = nz

For each entry of the list (comma-separated) there has to be a forecast point profile. The profile sets the filename of the forecast point file in DBF format.

# Absolute filename of the forecast point file in dBase format
gnsthreat.forecastPoints.nz.filename = @DATADIR@/toast/forecast/points/NZ_CFP.dbf

The threat level files contain forecast zones from 1 to 43 whereas TOAST uses the New Zealand forecast zones which have IDs starting with 7000. That is why a fix offset of 7000 is added to the threat level indices.

Configuration

etc/defaults/global.cfg
etc/defaults/gnsthreat.cfg
etc/global.cfg
etc/gnsthreat.cfg
~/.seiscomp/global.cfg
~/.seiscomp/gnsthreat.cfg

gnsthreat inherits global options.

gnsthreat.forecastPoints

Type: list:string

Registration of forecast zones.

gnsthreat.files.min1cm

Type: string

File in CSV format from which the tmin1cm values are read. Default is @DATADIR@/simgnsthreat/Header_Tmin_1cmThreatLevel.csv.

gnsthreat.files.min30cm

Type: string

File in CSV format from which the tmin30cm values are read. Default is @DATADIR@/simgnsthreat/Header_Tmin_30cmThreatLevel.csv.

gnsthreat.files.hpct99

Type: string

File in CSV format from which the hpct99 values are read. Default is @DATADIR@/simgnsthreat/Header_Hpct99ThreatLevel.csv.

gnsthreat.matching.magnitudeUncertainty

Type: float

Maximum allowed magnitude difference. Default is 0.2.

gnsthreat.matching.maxScenarios

Type: int

Maximum number of returned scenarios. Use 0 to disable the restriction. Default is 3.

gnsthreat.matching.fallbackSearchRadius

Type: float

Unit: km

Continue the search within a circular area if the number of found scenarios is smaller than configured in gnsthreat.maxScenarios. Default is 200.

Note

gnsthreat.forecastPoints.$name.* $name is a placeholder for the name to be used and needs to be added to forecastPoints to become active.

forecastPoints = a,b
gnsthreat.forecastPoints.a.value1 = ...
gnsthreat.forecastPoints.b.value1 = ...
# c is not active because it has not been added
# to the list of forecastPoints
gnsthreat.forecastPoints.c.value1 = ...
gnsthreat.forecastPoints.$name.filename

Type: string

Absolute filename of the forecast point file in dBase format.