# ML_IDC — SeisComP Release documentation

6.9.0

# ML_IDC

CTBTO/IDC local magnitude.

## Description

### Amplitude

The SNSNR amplitudes are calculated on the vertical component seismograms.

### Station Magnitude

with

A: amplitude of type SBSNR

B: attenuation correction function of epicentral distance in km

The default corrections are read from a file installed at `@DATADIR@/magnitudes/IDC/global.ml`. If that file is not present no magnitude will be calculated.

### Station corrections

Station magnitudes can be computed with a station specific correction table which is configured in the global bindings. The parameter `magnitudes.ML(IDC).A` takes a path and allows to use placeholders for network code (`{net}`), station code (`{sta}`) and location code (`{loc}`).

Example:

    magnitudes.ML(IDC).A = @DATADIR@/magnitudes/IDC/{net}.{sta}.ml

- Amplitude unit in SeisComP: nanometer (nm)

- Time window: 4.5 s

- Default distance range: 0 - 20 deg

- Depth range: 0 - 40 km