Active Piedmont Zone Deformation, a manifestation of activity on the ‘Master Ray Fault’; insight into the seismic hazard analysis of the Tehran metropolitan area
Bibliographic record
Abstract
Abstract. The piedmont zone in the frontal active regions of the orogenic belts exhibits various deformation patterns, which helps unravel the seismic sources for cities that flourish in such tectonic settings. A detailed analysis of the active folding, faulting, and related morphological features of the Quaternary alluvial units disclose prominent thrust faults in the Tehran piedmont zone. These faults are kinematically related and play a vital role in a better understanding of the seismic hazard of the Tehran metropolitan area. The five south-dipping thrust faults, the related hanging-wall folding and subsidiary faulting accommodate a considerable amount of north-south shortening during Quaternary. The shortening is observed in the alluviums and the underlying Eocene volcanic bedrock. Interestingly, in western Tehran, the Chitgar area discloses a type locality for active fault-bend folding, backthrusting, oblique-slip normal faulting and fault inversion in the piedmont zone. Our optically stimulated luminescence dating on the Late Pleistocene alluviums in the Chitgar area constrains the slip rate of the primary and secondary faults. According to our analyses, we introduce the ‘Master Ray Fault’ as a crucial seismogenic fault of the Tehran region, manifested as south-dipping thrust faults in the piedmont zone. We estimate the minimum slip rate on the Master Ray Fault to be ca. 0.50 mm a-1. Our study offers a crucial methodological framework for improving the existing understanding on Quaternary thrust fault kinematics and associated morphological features, aiding in the unveiling of potential seismic sources in metropolitan areas located in piedmont zones adjacent to active orogenic belts.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| 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) | 0.001 | 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".