Beachball-3D — 3D Focal Mechanism & Seismotectonic Stereonet Workbench
Created: August 2026
Live Production App: beachball-3d.yufajjiru.work
GitHub Repository: github.com/luthfiyufajjiru/beachball-3d-stereonet
Powered by: Terraversi
An interactive 3D focal mechanism simulator, stereographic projection tool, and seismotectonic workbench built for structural geologists, seismologists, and earth science researchers.
Key Capabilities
- Real-Time 3D Focal Sphere Shaders: Custom WebGL/Three.js GLSL shaders evaluating orthogonal nodal planes and compressional/dilatational quadrants analytically on the unit sphere.
- Geophysical Standards: Strict implementation of Aki & Richards (1980) coordinate conventions (NED frame), analytical auxiliary conjugate plane (NP2) derivation, and Frohlich (1992) ternary slip classification (T,N,SS).
- Live National & Global Earthquake Feeds: Concurrent telemetry ingestion from BMKG TEWS (Indonesia) and USGS ComCat (Global) moment tensor catalogs.
- Automated Seismotectonic Inference: Hypocenter depth and regional fault database matching against active Indonesian tectonic structures (Sunda Megathrust, Flores Back-Arc Thrust, Palu-Koro Fault, Semangko Fault, and Wadati-Benioff slabs).
- Spatial Area Stress Inversion: Interactive map bounding box selection with Kostrov (1974) moment-tensor summation and Jacobi eigenvalue rotation.
- Publication-Ready Deliverables: Direct export to Generic Mapping Tools (GMT
psmeca), vector SVG stereonets, high-resolution PNG snapshots, and reproducible JSON archives.
Technical Stack & Architecture
| Layer | Technology |
|---|---|
| Frontend Framework | React 19, TypeScript, Tailwind CSS |
| 3D Graphics & Shaders | Three.js, Custom GLSL Shaders |
| Mapping & Geospatial | Leaflet, OpenStreetMap / CartoDB |
| Math & Inversion Engine | Analytical Jacobi Eigenvalue Solver, Kostrov (1974) Moment Summation |
| Data Ingestion | BMKG TEWS API, USGS ComCat FDSN GeoJSON |
| Hosting & Deployment | Firebase Hosting / Cloudflare Static Architecture |
- Live Application: https://beachball-3d.yufajjiru.work
- Source Code: https://github.com/luthfiyufajjiru/beachball-3d-stereonet