pySW4.prep.source module

Python module to help specify the source parameters.

author:Shahar Shani-Kadmiel (s.shanikadmiel@tudelft.nl)
copyright:Shahar Shani-Kadmiel
license:This code is distributed under the terms of the GNU Lesser General Public License, Version 3 (https://www.gnu.org/copyleft/lesser.html)
M0(Mw)[source]

Calculate Seismic Moment M0 in N m from Moment Magnitude Mw

Mw(M0)[source]

Calculate Moment Magnitude Mw from Seismic Moment M0 in N m

f_max(vmin, h, ppw=8)[source]

Calculate the maximum resolved frequency that meets the requirement that the shortest wavelength (\(\lambda=V_{min}/f_{max}\)) be sampled by a minimum points-per-wavelength (ppw).

Parameters:

vmin : float

Minimum seismic velocity in the computational doamin in m/s.

h : float

Grid spacing of the computational doamin in meters.

ppw :

Minimum points-per-wavelenght required for the computation. Set to 8 by default.
Returns:

float

The suggested fmax in Hz.

See also

grid_spacing, get_vmin, source_frequency

gaussian_stf(time, t0, freq)[source]

Gaussian source-time-function.

source_frequency(fmax, stf='Gaussian')[source]

Calculate the angular frequency \(\omega\), freq attribute on the source line in the SW4 inputfile.

Parameters:

fmax : float

Maximum frequency in the source-time function frequency content, Hz.

stf : str

Source-time function name. It can have the following values: ‘GaussianInt’, ‘Gaussian’ (default), ‘RickerInt’, ‘Ricker’, ‘Ramp’, ‘Triangle’, ‘Sawtooth’, ‘Smoothwave’, ‘VerySmoothBump’, ‘Brune’, ‘BruneSmoothed’, ‘GaussianWindow’, ‘Liu’, ‘Dirac’, and ‘C6SmoothBump’.

See the SW4 User Guide for further details.

Returns:

2-tuple

f0, freq. freq is the value which goes on the source line in the SW4 inputfile.
t0(freq, t0=0.0, stf='Gaussian')[source]

Calculate the t0 attribute on the source line in the SW4 inputfile.

Parameters:

freq : float

The angular frequency value used for the freq attribute on the source line in the SW4 inputfile.

t0 : float

The calculated t0 is added to the supllied t0 in the function call.

stf : str

The source-time function name.