# Recorded earthquake data sources

The catalogue contains complete numeric acceleration arrays from the official OpenSees public example repository, pinned to revision 01315fb6e609e101fd8d1b0176496febd723d47d:
https://github.com/OpenSees/OpenSees/tree/01315fb6e609e101fd8d1b0176496febd723d47d

Files:
- EXAMPLES/ExampleScripts/elCentro.AT2 — El Centro 1940 N–S, Peknold version, as labelled in the header.
- EXAMPLES/ExampleScripts/ARL360.at2 — Northridge 1994, Arleta, 360; Pacific Engineering and Analysis.
- EXAMPLES/SmallMP/GM/HOS180.AT2 — Big Bear 1992, San Bernardino E & Hospitality, 180; CDMG 23542; PEER / Pacific Engineering.
- EXAMPLES/SmallMP/GM/GCN-WE.AT2 — Lazio–Abruzzo 1984, Garigliano Centrale Nucleare W–E; PEER / Pacific Engineering.
- EXAMPLES/SmallMP/GM/HWA002-N.AT2 — Chi-Chi 1999, HWA002 N, CWB; PEER / Pacific Engineering.

Retrieved 2026-09-13. Original source headers and raw-file SHA-256 checksums are retained in each JSON and the catalogue. The original AT2 files are included verbatim under original/. Numeric values are converted from published g to m/s² only in the numerical solver, using g = 9.80665 m/s². Source files are freely downloadable without an account from the URLs above. A public download is not a claim that all underlying database content shares a particular licence; preserve original credits and consult each originating provider for broader reuse.

There is no claim that these five records represent any particular site's seismic hazard. Record processing and amplitudes are those of these exact public example versions. Some earthquake names have several different published versions; in particular, the bundled El Centro file has PGA 0.31882 g, not a substituted 0.348 g version. Time is relative to sample zero, not UTC or event origin time.

Original providers referenced by the headers:
https://peer.berkeley.edu/
https://www.conservation.ca.gov/cgs/strong-motion
https://www.cwa.gov.tw/eng/

Calculation references:
https://opensees.github.io/OpenSeesDocumentation/user/manual/analysis/integrator/Newmark.html
https://opensees.github.io/OpenSeesDocumentation/user/manual/model/pattern/uniformExcitationPattern.html