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MTtime (Time Domain Moment Tensor Inversion in Python) is a python package developed for time domain inversion of complete seismic waveform datato obtain the seismic moment tensor. It supports deviatoric and full moment tensor inversions,and 1-D and 3-D basis Green's functions.

The package was developed on python 3.7 and 3.8, and is running and tested on Mac OSX.

• ObsPy and its dependencies
• pandas
• cartopy (for plotting maps)

• Create a Python environment
• Install ObsPy and pandas
• Make sure you havecloned the repository
• Install mttime

I recommend installing Python viaMinicondaorAnaconda. Choose Miniconda for a lower footprint.Then follow the instructions on their sites to installObsPyandpandasfor your given platform.

Download mttime and install it from source. If you installed Python via conda make sure you activatethe environment where ObsPy and pandas are installed.

# Activate environmentconda activate your_environment# Build and install mttimegit clone https://github.com/LLNL/mttimecd mttimepip install.

Finally, if you want to run the tutorials you will need to installJupyter Notebook.

Executing the package from command line will launch the inversion,save and plot the result to file:

mttime-run mtinv.in

The equivalent in the Python console:

importmttimeconfig=mttime.Configure(path_to_file="mtinv.in")mt=mttime.Inversion(config=config)mt.invert()mt.write()

• Documentation for mttime
• A working example

mttime is distributed under the terms of LGPL-3.0 license. All new contributions must be made under the LGPL-3.0 license.

SPDX-License-Identifier: LGPL-3.0

LLNL-CODE-814839