Package: seislib
SeisLib is a Python package that allows for obtaining seismic images of the sub-surface from the local to the global scale. It is the result of a long-term effort of our team to make efficient and open source some of the Python codes behind our seismological publications over the last few years. The library is in rapid expansion and, at present, includes:Seismic Ambient Noise InterferometryAutomated download of continuous seismogramsFast cross-correlation of continuous seismograms in the frequency domainExtraction of frequency-dependent phase velocities for both Rayleigh and Love waves based on pairs of receiversRetrieval of frequency-dependent Rayleigh-wave attenuation coefficient based on dense seismic arraysSurface-Wave Tomography based on Teleseismic EarthquakesAutomated download of seismograms recording strong earthquakesRetrieval of frequency-dependent Rayleigh and Love phase velocities based on pairs of receivers lying on the same great-circle path as the epicentre (Two-Station Method)Least-Squares Imaging of Lateral Variations in Surface-Wave VelocityEqual-area and regular parameterizations, suited for data sets collected at local, regional, and global scaleAdaptive parameterizations, with finer resolution in the areas characterized by relatively high density of measurementsLinearized inversion of velocity measurements based on ray theoryComputational speed optimized (via Cython) for very large data setsPossibility to perform L-curve analyses and resolution tests (e.g., spike, checkerboard)DocumentationFor more information on SeisLib, make sure to visit ourwiki page!InstallationFirst, make sure you have all the dependencies installed, i.e.,obspy,cartopy, andcython. We recommend installing such dependences using conda (see below). You will also needgccor equivalent, to compile the cython parts of the library.condacreate-nseislibpython=3.9numpy=1.20
condaactivateseislib
condainstall-cconda-forgeobspy
condainstall-cconda-forgecartopy
condainstall-canacondacythonNote that we installed Python 3.9 (rather than Python 3.10) since numpy's version 1.22 currently leads to compatibility issues. Once the above dependences have been installed, you can proceed with the installation ofseislib.pip install seislibIf you run into troubles with the above, you can try the following approach:git clone https://github.com/fmagrini/seislib.git
cd seislib/seislib/tomography/_ray_theory
python setup_all.py build_ext --inplaceThe last command will compile the Cython files. If you work on an anaconda environment, you might need to replace "python" with, e.g., "/home/your_name/anaconda3/bin/python". (You can retrieve the path to your python executable by typing "import sys; print(sys.executable)" in your Python GUI. Make sure to then add ~/seislib to your path to being able to import its modules in your Python codes.ReferencesSpecific to the Python package:Magrini, F., Lauro, S., Kästle, E. & Boschi, L., 2022. Surface-wave tomography using SeisLib: a Python package for multi-scale seismic imaging.Geophys. J. Int., ggac236,https://doi.org/10.1093/gji/ggac236Additional references depending on the use you made of SeisLib:Boschi, L. & Dziewonski, A.M., 1999. High- and low-resolution images of the Earth's mantle: Implications of different approaches to tomographic modeling.J. Geophys. Res., 104(B11)Boschi, L., Magrini, F., Cammarano, F., & van der Meijde, M. 2019. On seismic ambient noise cross-correlation and surface-wave attenuation.Geophys. J. Int., 219(3), 1568-1589Kästle, E., Soomro, R., Weemstra, C., Boschi, L. & Meier, T., 2016. Two-receiver measurements of phase velocity: cross-validation of ambient-noise and earthquake-based observations.Geophys. J. Int., 207, 1493-1512Magrini, F., Diaferia, G., Boschi, L. & Cammarano, F., 2020. Arrival-angle effects on two-receiver measurements of phase velocity.Geophys. J. Int., 220, 1838-1844Magrini, F. & Boschi, L., 2021. Surface-wave attenuation from seismic ambient noise: numerical validation and application.J. Geophys. Res., 126, e2020JB019865Magrini, F., Boschi, L., Gualtieri, L., Lekić, V. & Cammarano, F., 2021. Rayleigh‑wave attenuation across the conterminous United States in the microseism frequency band.Scientific Reports, 11, 1-9