Passive seismic survey results of sediment thickness at three 5200 cal yr BP landslide sites in eastern Ontario and western Quebec
Bibliographic record
Abstract
Passive seismic surveys or Horizontal-to-Vertical Spectral Ratio (HVSR) measurements can be used to estimate sediment thickness or depth to bedrock. Three landslide sites were selected strategically for potential geotechnical studies. The bedrock depth estimates obtained from passive seismic surveys may aid in the planning of the geotechnical drilling programs. Geotechnical investigations of paleo-landslides are important for earthquake research as they can provide more precise estimates of the location and magnitude of pre-historic earthquakes. This document reports results of passive seismic surveys at three prehistoric landslide sites near Cheney and Wendover in eastern Ontario, and Masson in western Quebec. The sites are among 13 landslides previously dated to have occurred about 5200 cal yr BP. The landslides are Champlain Sea clay failures and are hypothesized in previous studies as triggered by an earthquake around that time. Passive seismic surveys are conducted along the approximate centerlines of the landslides to estimate the thickness of the Champlain Sea sediments. The range of the sediment thickness is found to be around 30, 40 and 50 m at Cheney, Masson and Wendover site respectively. Sediment profiles are interpreted along the longitudinal sections. The results show variable bedrock depths at Cheney and Masson sites. The interpreted bedrock at the Wendover site is deeper and appears more even. These bedrock depth estimates form the planning basis of potential future geotechnical drilling programs. Upon borehole confirmation, the survey results may help construct models for slope stability analysis.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".