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We are pleased to announce the release of OpenSHA 26.1.0, now available for download at: https://opensha.org.
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As an object-oriented framework, OpenSHA can accommodate arbitrarily complex (e.g., physics based) earthquake rupture forecasts (ERFs), ground-motion models, and engineering-response models, which narrows the gap between cutting-edge geophysics and state-of-the-art hazard and risk evaluations.
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This release introduces a powerful new application for intensity measure calculations and improves the reliability of ERF data access.
Key Highlights in OpenSHA 26.1.0
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New Application: IMEventSetCalculator (GUI and Command Line Tool)
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- OpenSHA 26.1.0 introduces the IMEventSetCalculator, available both as a graphical user interface (GUI) and a command line tool (CLT).
- This new application enables calculation of mean and sigma intensity measures (IMs) across multiple sites using selected:
- Intensity Measure Relationships (IMRs)
- Intensity Measure Types (IMTs)
- Earthquake Rupture Forecasts (ERFs)
- Interactive selection of IMRs and IMTs
- Support for multiple user-defined sites
- Adjustable IMR and ERF parameters
- Site data configuration (e.g., Vs30, Z1.0, Z2.5) via web services or manual entry
- Streamlined interface for batch-processing workflows
- Simplified configuration for automated pipelines
CLT documentation is available in:
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IMEventSetCalculatorCLT-26.1.0/README.txt
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A GUI tutorial is available at:
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We have enhanced the robustness of ERF data downloads:
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- ERF data for recent models are now retrieved on-demand from USC and AWS servers.
- Automatic fallback server querying has been implemented if a primary server is unavailable.
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This update leverages an upgraded GetFile framework (v25.11.0), which supports querying multiple server metadata URIs for improved resilience.
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These changes significantly improve reliability when downloading large, distributed ERF datasets.
Infrastructure & Platform Updates
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- Encrypted (HTTPS) support for Tomcat9 servlets, improving security for:
- GMT map generation
- Site Data Provider retrieval
- Clarified messaging in the disaggregation consolidated source data list.
- Dropped support for the WG02 Fortran Wrapped ERF Epistemic List across all OpenSHA applications as part of ongoing modernization efforts.
Nightly Build Support: NSHM25 Puerto Rico & Virgin Islands ERF
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OpenSHA nightly builds now include support for the NSHM25 Puerto Rico and Virgin Islands ERF, which is currently under active development.
Please note:
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- This ERF is available in nightly builds only
- It is not yet included in the production release
We encourage interested users to test and provide feedback as development progresses.
Previous Hotfix (25.4.3)
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The prior 25.4.3 hotfix resolved an issue preventing UCERF3 and NSHM23 ERF data from downloading following maintenance on USC CARC.
Why Upgrade?
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- A powerful new workflow for multi-site intensity measure calculations
- Improved reliability for distributed ERF data access
- UI improvements and bug fixes across applications
- Encrypted communications with web services
- Continued modernization and cleanup of legacy components
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We strongly encourage users to upgrade to take advantage of these new capabilities and infrastructure improvements.
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Getting Started & Support
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For questions or assistance, please contact the SCEC software development group at: software@scec.org.
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Thank you for your continued support of OpenSHA. We look forward to seeing how you use the new IM Event Set Calculator in your research and hazard applications.
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Best regards,
Akash Bhatthal
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SCEC Software Engineer, OpenSHA
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