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Evidence Dossier

Legacy category: Terrestrial Physical Anomaly Investigation

The 1958 Lituya Bay Giant Wave Investigation

Evidence Dossier: A record proves that a statement, transfer, examination, or result was documented. It does not automatically prove the anomalous interpretation attached to it.
OverviewEvidenceTimelineAnalysisSources
1958-07-09
Lituya Bay, Alaska, United States
9/10
3/10
A magnitude 7.8 earthquake triggered a huge rockslide into Lituya Bay in 1958. Eyewitness accounts, mapped trimlines, a complete USGS monograph, and a later regional hazard review document how the extraordinary run up was investigated and resolved as an impact generated giant wave.
Strong for the wave height and rockslide mechanism based on the central USGS monograph (which includes its accompanying plate 2 map) and the later 1972 hazard synthesis. The monograph and map plate represent a single research lineage.

Investigative Assessments

"The reported claim remains worth testing against the record: A magnitude 7.8 earthquake triggered a huge rockslide into Lituya Bay in 1958. Eyewitness accounts, mapped trimlines, a complete USGS monograph, and a later regional hazard review document how the extraordinary run up was investigated and resolved as an impact generated giant wave. The strongest documented reasons to keep the file open are: Giant Waves in Lituya Bay, Alaska: central primary record; Map of Lituya Bay and adjoining area, showing trimlines of known giant waves: primary field map. Key unresolved lead: The precise volume and dynamics of the 1958 rockslide remain model-dependent."
"Evidentiary limitations: Strong for the wave height and rockslide mechanism based on the central USGS monograph (which includes its accompanying plate 2 map) and the later 1972 hazard synthesis. The monograph and map plate represent a single research lineage. Note that: Giant Waves in Lituya Bay, Alaska fails to support: This source does not provide the original field notes, raw survey calculations, or independent audio records of survivor interviews; Map of Lituya Bay and adjoining area, showing trimlines of known giant waves fails to support: This map plate does not provide the raw photogrammetric inputs or original field mapping data. Documented contradiction: The precise volume and dynamics of the 1958 rockslide remain model-dependent. Leading conventional hypothesis: Earthquake triggered rockslide impact generated the giant wave and extreme localized run up."

Case Summary

A magnitude 7.8 earthquake triggered a huge rockslide into Lituya Bay in 1958. Eyewitness accounts, mapped trimlines, a complete USGS monograph, and a later regional hazard review document how the extraordinary run up was investigated and resolved as an impact generated giant wave.

Evidence Locker

3 inspectable evidence items. Claims and source findings are kept separate.

scientific analysis Local copy hash-verified Complete source

Giant Waves in Lituya Bay, Alaska

Analyst rating: central primary record

“A timely account of the nature and possible causes of certain giant waves, with eyewitness reports of their destructive capacity”
Record locationtitle page, PDF page 2
Evidence classcentral primary record
Relationship to claimcentral primary record
Authenticity assessmentStrong for source identity and file integrity; causal weight is assessed separately.
What this supportscentral primary record
What it does not supportThis source does not provide the original field notes, raw survey calculations, or independent audio records of survivor interviews.
ProvenanceUSGS Professional Paper 354-C acquired from the U.S. Geological Survey publication repository.
Chain of custodyAcquired from the U.S. Geological Survey publication endpoint to the local verified PDF.
Source completenessComplete. Complete 48-page monograph containing the full text, figures, tables, and survivor accounts as published by the USGS.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record
government report Local copy hash-verified Complete source

Map of Lituya Bay and adjoining area, showing trimlines of known giant waves

Analyst rating: primary field map

“MAP OF LITUYA BAY AND ADJOINING AREA, SHOWING SUBAERIAL AND SUBMARINE TOPOGRAPHY, TRACE OF FAIRWEATHER FAULT AND TRIMLINES OF KNOWN GIANT WAVES AS MAPPED IN THE FIELD AND FROM PHOTOGRAPHS”
Record locationsingle-sheet plate; OCR verified against rendered plate
Evidence classprimary field map
Relationship to claimprimary field map
Authenticity assessmentStrong for source identity and file integrity; causal weight is assessed separately.
What this supportsprimary field map
What it does not supportThis map plate does not provide the raw photogrammetric inputs or original field mapping data.
ProvenancePlate 2 map distributed as an accompaniment to USGS Professional Paper 354-C.
Chain of custodyAcquired from the U.S. Geological Survey publication endpoint as an accompanying sheet to the main monograph PDF.
Source completenessComplete. A single-page high-resolution map plate distributed with the main paper. It contains the complete spatial overlay of the bay and trimlines.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record
scientific analysis Local copy hash-verified Complete source

Regional and other general factors bearing on evaluation of earthquake and other geologic hazards to coastal communities of southeastern Alaska

Analyst rating: independent corrective record

“a huge rockslide plunged down a steep slope at the head of Lituya Bay and generated a wave 1,740 feet high.”
Record locationsection discussing earthquake-induced subaerial slides and slumps
Evidence classindependent corrective record
Relationship to claimindependent corrective record
Authenticity assessmentStrong for source identity and file integrity; causal weight is assessed separately.
What this supportsindependent corrective record
What it does not supportThis report does not contain new primary measurements for the 1958 wave and is limited to regional synthesis.
ProvenanceUSGS Open-File Report 72-230 acquired from the U.S. Geological Survey publication repository.
Chain of custodyAcquired from the U.S. Geological Survey publication endpoint to the local verified PDF.
Source completenessComplete. Complete 110-page regional hazard report; minor internal PDF syntax warnings do not prevent inspection of the relevant pages.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record

Documented Timeline

  • 1958-07-09: Central event or observation represented by the staged sources.

Named Participants and Roles

  • Howard G. Ulrich, Survived the wave aboard his boat Edrie. Account basis: Retrospective. Witness quality: Moderate. Ulrich survived aboard the boat Edrie anchored near the entrance of the bay, providing a direct vantage point of the wave's path, but his account was recorded by the USGS investigator months later and is preserved only through the monograph transcription. Evidence: lituya-usgs-monograph
  • William A. Swanson, Survived the wave aboard his boat Badger. Account basis: Retrospective. Witness quality: Moderate. Swanson survived aboard the boat Badger near the spit, witnessing the slide area and wave propagation, but his vessel was destroyed and his account was recorded after the event and transcribed within the monograph. Evidence: lituya-usgs-monograph

Contradictions and Record Conflicts

  • The precise volume and dynamics of the 1958 rockslide remain model-dependent.

Conventional Explanations

  • Earthquake triggered rockslide impact generated the giant wave and extreme localized run up.
    Evidence for: The monograph ties eyewitness accounts, mapped trimlines, and the impact setting together; the later regional hazard report independently carries the rockslide wave interpretation.
    Limits: Exact slide volume and detailed hydrodynamics have been refined since 1960, but the rockslide generated wave mechanism is not dependent on a paranormal claim.
    Evidence: lituya-usgs-monograph, lituya-usgs-plate, lituya-usgs-corrective

Evidence Stance Matrix

HypothesisStanceRationaleEvidence IDs
A rockslide displaced bay water and generated the 1958 giant wave.SupportsThe USGS monograph (with its integrated plate 2 map) and the 1972 hazard synthesis support the rockslide-wave chain.lituya-usgs-monograph, lituya-usgs-plate, lituya-usgs-corrective
The mapped high trimline was unrelated to the 1958 wave.ChallengesThe field map plate and monograph attribute the trimline to the giant-wave sequence, challenging the idea that they are unrelated.lituya-usgs-monograph, lituya-usgs-plate

Missing Evidence

  • Original field notebooks and mapping records from Don J. Miller's 1958 field investigations
    Limits the ability to check the raw daily observations, field sketches, and trimline measurements against the edited monograph text.
  • Original raw survey measurements, photographic negatives, and photogrammetric control data for the trimline calculations
    Prevents independent mathematical recalculation of the peak run-up elevation and slide-volume estimates.
  • Firsthand audio recordings or signed transcripts of survivor interviews conducted by the USGS
    Survivor accounts are only accessible through the edited, filtered summaries in the USGS monograph, hiding potential details or inconsistencies.
  • Geotechnical calibration data and physical core samples from the slide scar area
    Limits the verification of the initial slide mass velocity, slide volume, and geological triggering thresholds.

What Remains Unresolved

  • The precise volume and dynamics of the 1958 rockslide remain model-dependent.
    The complete federal records establish the mechanism but predate modern high-resolution numerical reconstructions.

Investigative Hypotheses

  • A rockslide displaced bay water and generated the 1958 giant wave.
  • The mapped high trimline was unrelated to the 1958 wave.

Open Questions

  • The precise volume and dynamics of the 1958 rockslide remain model-dependent.

Archival Landing Pages and Evidence Corpus

Giant Waves in Lituya Bay, Alaska

Central Primary Record Local Source Verified

External URL: https://pubs.usgs.gov/publication/pp354C

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Map of Lituya Bay and adjoining area, showing trimlines of known giant waves

Primary Field Map Local Source Verified

External URL: https://pubs.usgs.gov/pp/0354c/plate-2.pdf

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Regional and other general factors bearing on evaluation of earthquake and other geologic hazards to coastal communities of southeastern Alaska

Independent Corrective Record Local Source Verified

External URL: https://pubs.usgs.gov/publication/ofr72230

Open Local Artifact (PDF Document) · Download Copy