Integrated Workflow for Earthquake Stress Modelling and Seismicity Analysis Using Coulomb 4.0 and the ISC Earthquake Toolbox

We introduce an integrated workflow in MATLAB that combines Coulomb 4.0, a major revision of the widely used Coulomb, stress interaction and deformation application, with the ISC Earthquake Toolbox, which provides direct access to the International Seismological Centre (ISC) Bulletin. This interoperability enables researchers to seamlessly transition from global earthquake data acquisition to stress interaction analysis within a single environment.The workflow begins by querying and importing earthquake catalogs from the ISC Bulletin using the toolbox’s GUI, allowing selection by time, region, depth and magnitude. These events can then be visualized in 3D and cross-section views, and their parametric data, including moment tensors, are used to define fault geometries in Coulomb 4.0. New Coulomb features, such as automatic fault parameter scaling from magnitude and interactive fault editing, streamline the setup of rupture planes based on ISC-reported events. Stress transfer calculations and deformation modelling can then be performed, with results displayed alongside seismicity overlays for comprehensive interpretation.This combined approach enhances reproducibility and efficiency by eliminating manual data handling and enabling dynamic visualization of both seismicity and modelled stress/deformation changes. We demonstrate the workflow using recent seismic sequences, highlighting its potential for earthquake interaction studies, hazard assessment, and educational applications. By bridging global seismic data with advanced stress modelling, this interoperability represents a significant step toward integrated geoscience software ecosystems.The ISC Earthquake Toolbox can be freely accessed from:GitHub (https://github.com/tomgarth/ISC_Earthquake_Toolbox) andFile Exchange (https://www.mathworks.com/matlabcentral/fileexchange/167786-isc-earthquake-toolbox?s_tid=srchtitle)Coulomb 4.0 can be freely accessed from:GitHub (https://github.com/YoshKae/Coulomb_ver4) andtemblor.net/coulomb/.