Spatial Variation in the Slip Zone Thickness of a Seismogenic Fault
Bibliographic record
Abstract
Abstract Fault slip is predominantly localized onto narrow slip zones embedded within broader zones of fault rock and subsidiary damage. As earthquakes re‐rupture the same slip zone multiple times, the composition and geometry of the slip zone significantly affect dynamic processes. Here we use three large cross‐sectional exposures of an exhumed fault to show that the thickness of a slip zone that accommodated seismic slip varies by an order of magnitude over tens of meters along strike. Geostatistical analyses show that the thickness variations are characterized by a correlation length scale of ~1 m and a characteristic spacing of 2–4 m. We suggest that the spacing between regions of correlated thickness represents the dimension of contact asperities on the fault. Similar magnitude variations in slip zone thickness should be generic to faults in the brittle crust, implying that slip‐weakening mechanisms such as thermal pressurization are spatially variable during seismic slip.
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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 | 0.001 | 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) | 0.001 | 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".