A wider seismogenic zone at Cascadia due to fluid circulation in subducting oceanic crust
Bibliographic record
Abstract
Research Article| October 01, 2012 A wider seismogenic zone at Cascadia due to fluid circulation in subducting oceanic crust Brian D. Cozzens; Brian D. Cozzens Earth & Environmental Science Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar Glenn A. Spinelli Glenn A. Spinelli Earth & Environmental Science Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (10): 899–902. https://doi.org/10.1130/G33019.1 Article history received: 12 Nov 2011 rev-recd: 22 May 2012 accepted: 25 May 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Brian D. Cozzens, Glenn A. Spinelli; A wider seismogenic zone at Cascadia due to fluid circulation in subducting oceanic crust. Geology 2012;; 40 (10): 899–902. doi: https://doi.org/10.1130/G33019.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In the Cascadia subduction zone, the extent of the seismogenic portion of the plate interface is poorly resolved by seismicity due to the lack of a large megathrust event during the instrumental record. Therefore, fault zone temperatures (∼150 to 350 °C) are used to estimate the limits of the seismogenic zone. Previous thermal models for the Cascadia margin estimated that 350 °C on the plate boundary occurs ∼40–70 km offshore. In contrast, models of interseismic deformation have been interpreted to indicate a seismogenic zone extending landward of the coastline to the updip edge of a region of episodic tremor and slip (ETS). We examined Cascadia subduction zone temperatures with thermal models that include the effects of fluid circulation in an ocean crust aquifer. Fluid circulation cools the subduction zone and widens the thermally defined seismogenic zone by shifting the 350 °C isotherm at the plate boundary ∼30–55 km landward relative to results from simulations without fluid flow. Our thermal models indicate a 60–80-km-wide transition zone between 350 °C on the fault and the updip edge of ETS. Under British Columbia (Canada), Washington, and Oregon (United States), ETS occurs at ∼410–550 °C. The location of the basalt-to-eclogite transition in the subducting crust provides an important constraint on the thermal models because hydrothermal circulation in the ocean crust aquifer produces only small surface heat flux anomalies on this margin with thick sediment in the trench and on the incoming plate. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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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) | 0.003 | 0.002 |
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; both teacher heads agree on what is shown here.
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".