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Government or official record

The 1933 Long Beach Earthquake

California Geological Survey

Cross-File evidence ledger

Where this source supports the record

Each entry separates the File’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.

  1. Natural disasters · 10 March 1933

    The 1933 Long Beach Earthquake

    Offshore Newport–Inglewood Fault epicenter south of Huntington Beach · United States

    Open File evidence →
    Why editors use it here

    State chronology and statistics for time, epicenter, fault, casualties, school damage, and the Field Act.

    1. Quick read

      At 5:54 p.m.

      Reviewed 24 July 2026
    2. Trigger and conditions

      Subsurface rupture propagated northwest along the Newport–Inglewood Fault for roughly twenty-five kilometers in modern reconstructions.

      Reviewed 24 July 2026
    3. Uncertainty

      Early instrumental limits produced differing magnitude and rupture estimates.

      Reviewed 24 July 2026
    4. Why it matters

      The earthquake converted visible school collapse into enforceable public policy.

      Reviewed 24 July 2026