Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL073744 |
Links between clay transformation and earthquakes along the Costa Rican subduction margin | |
Lauer, Rachel M.1; Saffer, Demian M.2,3; Harris, Robert N.4 | |
2017-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:15 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | We investigate the depth distribution of smectite clay transformation and its along-strike variability at the Middle America Trench offshore Costa Rica. We take advantage of recent well-constrained thermal models that refine our understanding of the margin's thermal structure and which capture significant along-strike variability. Using these thermal models, together with sediment compositions defined by drilling, we compute the distribution of smectite transformation and associated fluid production. We show that the hypocenters of large (M > 6.9) well-located megathrust earthquakes lie consistently downdip of peak fluid production. We suggest that silica cementation associated with smectite transformation promotes lithification and slip-weakening behavior that, in combination with declining fluid pressures, facilitate the initiation of unstable slip. The earthquake ruptures extend updip into the region of peak reaction, possibly due to excess pore pressures that facilitate their propagation. These results are consistent with the hypothesis that smectite transformation contributes to the onset of stick-slip behavior and acts as an important control on earthquake nucleation and propagation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408379000019 |
WOS关键词 | SEISMOGENIC ZONE STRUCTURE ; MIDDLE AMERICA TRENCH ; NICOYA PENINSULA ; ACCRETIONARY COMPLEX ; SMECTITE DIAGENESIS ; ILLITE REACTION ; UPDIP LIMIT ; COCOS PLATE ; FLUID-FLOW ; SEDIMENTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29146 |
专题 | 气候变化 |
作者单位 | 1.Univ Calgary, Dept Geosci, Calgary, AB, Canada; 2.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 3.Penn State Univ, Ctr Geomech Geofluids & Geohazards, University Pk, PA 16802 USA; 4.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Lauer, Rachel M.,Saffer, Demian M.,Harris, Robert N.. Links between clay transformation and earthquakes along the Costa Rican subduction margin[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(15). |
APA | Lauer, Rachel M.,Saffer, Demian M.,&Harris, Robert N..(2017).Links between clay transformation and earthquakes along the Costa Rican subduction margin.GEOPHYSICAL RESEARCH LETTERS,44(15). |
MLA | Lauer, Rachel M.,et al."Links between clay transformation and earthquakes along the Costa Rican subduction margin".GEOPHYSICAL RESEARCH LETTERS 44.15(2017). |
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