High-Resolution Magnetic And Seismic Imaging Of Basement Faults In Western Lake Ontario And Lake Simcoe, Canada
Bibliographic record
Abstract
The tectonic 'rejuvenation' of Precambrian basement faults is now recognized as<br>an important mechanism for generating intraplate earthquakes. In many areas of<br>intraplate North America, concern for the design and safe operation of strategic facilities<br>(e.g. nuclear generating stations) has prompted efforts to re-evaluate basement seismic<br>hazards and map zones of basement faulting. In southern Ontario, Canada, recent efforts<br>have focused on evaluating deeply seated Grenville-age (ca. 1.2 Ga) basement fault<br>zones. The present study is applying a multi-parameter geophysical approach to<br>investigate basement fault zones underlying several lake basins in southern Ontario.<br>Geophysical investigations have included collection of >2000 line km of high-resolution<br>lake-based magnetic surveys (50-100 m line spacing, 1 m in-line sampling), 5-15KHz<br>sub-bottom sonar profiling and side-scan images in western Lake Ontario and Lake<br>Simcoe. Results from western Lake Ontario delineate a well-defined west-east linear<br>magnetic anomaly that is co-incident with a previously mapped fault (Hamilton-<br>Presqu'ile fault) that displaces Paleozoic bedrock with an apparent vertical offset of 50 m<br>in land-based shallow seismic data. Magnetic mapping in western Lake Simcoe reveals<br>west-east trending linear magnetic anomalies that displace a major Grenville-age terrane<br>boundary. The magnetic boundaries are spatially co-incident with faulting, slumps and<br>gas-escape structures in lake-bottom sediments and are interpreted as reactivated<br>basement faults.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".