GrowClust3D.jl: A Julia Package for the Relative Relocation of Earthquake Hypocenters Using 3D Velocity Models

Daniel Trugman

Published September 11, 2022, SCEC Contribution #12090, 2022 SCEC Annual Meeting Poster #116 (PDF)

Relative relocation techniques have become widely used to refine the resolution of earthquake hypocentral positions. GrowClust3D.jl is an open-source software package written in the programming language Julia that builds and improves upon the original GrowClust algorithm, an established relative relocation technique that applies cluster analysis to waveform cross-correlation measurements. The adoption of Julia’s modern programming environment allows for greater flexibility in GrowClust3D.jl’s algorithm design and computational implementation, and opens up new opportunities for enterprising and ambitious users. Notable additions to the GrowClust3D.jl package include (i) several parallel processing options to improve efficiency in bootstrap resampling uncertainty quantification routines, (ii) incorporation of geographic map projections and station elevations during the relocation process, and (iii) the ability to use travel-time tables derived from 3D velocity models. We demonstrate the new features of the software package on relocation problems of different scales in Nevada, California, Texas, and New Zealand, where in the latter two cases the use of a 3D velocity model helps resolve structures that remain obscure with earlier versions of GrowClust. We hope that the new GrowClust3D.jl software package will become a valuable public resource for SCEC researchers and the earthquake science community at large.

Key Words
open-source, software, location, GrowClust

Citation
Trugman, D. (2022, 09). GrowClust3D.jl: A Julia Package for the Relative Relocation of Earthquake Hypocenters Using 3D Velocity Models. Poster Presentation at 2022 SCEC Annual Meeting.

Related Projects & Working Groups
Computational Science (CS)