Relative Source-Time Function Studies and Stress Drop of Earthquakes in Southeastern Alaska-Northwestern Canada
Bibliographic record
Abstract
Abstract We use the relative source–time function (RSTF) method to estimate the source properties of earthquakes within southeastern Alaska–northwestern Canada in an effort to determine if there are systematic variations in the source parameters of these earthquakes (e.g., stress drop, rupture complexity, and rupture directivity) with the tectonic setting. In the RSTF technique we deconvolve the P-arrival signal of a smaller event from that of a larger event by the following process: select arrivals with a tapered cosine window, fast Fourier transform to obtain the spectrum, apply a water level to the spectrum of the smaller event, and apply a band-pass filter before inverse transforming the result to obtain the RSTF. Our results show self-similarity over earth-quakes of magnitude less than five and stress drop dependence on focal mechanism. Strike-slip events appear to have larger stress drops, with the highest stress drops for events within the Queen Charlotte fault system. We find evidence for rupture direc-tivity consistent with previous studies for three earthquakes that had adequate azimuthal station coverage.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 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".