Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington
Bibliographic record
Abstract
This report describes the acquisition, processing, and quality of seismic reflection and refraction data obtained in the Seattle basin, central Puget Lowland, western Washington, in September 1999 during the Seismic Hazards Investigation of Puget Sound (SHIPS).As a sequel to the 1998 SHIPS air gun experiment (also known as "Wet SHIPS"), the 1999 experiment, nicknamed "Dry SHIPS", acquired a 112-km-long east-west trending multichannel seismicreflection and refraction line in the Seattle basin.One thousand and eight seismographs were deployed at a nominal spacing of 100 meters and 29 shot points were detonated at approximately 4 km intervals along the seismic line.The wide-angle seismic profile was designed to (1) determine the E-W geometry of Seattle basin, (2) measure the seismic velocities within the basin, and (3) define the basement structure underlying the Seattle basin.In this report, we describe the acquisition of these data, discuss the processing and merging of the data into common shot gathers, and illustrate the acquired profiles.We also describe the format and content of the archival tapes containing the SEGY-formatted, common-shot gathers.Data quality is variable but useful data were acquired from all 29 shot points fired along the Dry SHIPS seismic line.The data show pronounced travel time delays associated with the low velocity sedimentary rocks filling the Seattle basin.Thirty-five REFTEK stations, deployed at 4 km intervals along the Dry SHIPS line, recorded 26 regional earthquakes and blasts and 17 teleseismic events, including the main shock and several aftershocks of the M w = 7.6 Chi-Chi (Taiwan) earthquake of 9/20/1999.The teleseismic recordings of the Chi-Chi (Taiwan) mainshock provide useful signals down to 10 second periods.They document a significant (factor between 5 and 10) focusing of compressional-and shear-wave energy by the Seattle basin at periods between 1 and 2 seconds relative to "bedrock" sites east and west of the basin.Signal durations in the Seattle basin were also substantially increased relative to "bedrock" sites in the Olympic peninsula and Cascade foothills.iii
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.003 |
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".