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DOI | 10.1029/2018GL080578 |
Rapid Geodetic Analysis of Subduction Zone Earthquakes Leveraging a 3-D Elastic Green's Function Library | |
Tung, S.1; Fielding, E. J.2; Bekaert, D. P. S.2; Masterlark, T.1 | |
2019-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:5页码:2475-2483 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The 2018 M7.2 Pinotepa earthquake ruptured a shallow slab section along the Middle America subduction zone. We demonstrate how a geodetic Green's function (GF) library and efficient modeling algorithm can rapidly resolve earthquake slip and contribute to early warning systems. The source is characterized with InSAR data and a finite-element model mimicking realistic slab geometry (Slab1.0) and velocity structures (CRUST2.0) that are not considered in the conventional homogeneous (HOM)- or layered(1-D)-crust solutions. The rupture is imaged 18 min after geodetic data are downloaded to a 16-CPU-thread workstation. Nearby M(w)8.6-megathrust scenarios are also studied with synthetic GPS data in the Guerrero/Oaxaca area. Our results show that earthquake slip solutions are sensitive to the materials of elastic-modeling domains. Attaining smaller misfits or sums of squared errors, models by 3-D GFs significantly better recover coseismic displacements than those estimated with 1-D GFs or HOM GFs at 95% confidence. Plain Language Summary A M(w)7.2 earthquake took place near the city of Pinotepa Nacinoal in Oaxaca, Mexico, on 16 February 2018 and became the third most significant event striking southern Mexico since mid-2017, after the M(w)8.2 Tehuantepec and M(w)7.1 Puebla-Morelos earthquakes. A new algorithm of deformation modeling is designed to use a fault library to efficiently characterize the earthquake source. This library accounts for fault slip within both rock and structural complexities documented within the Middle America subduction zone. We further study 100 M(w)8.6 megathrust scenarios and discover that an elastic model of these complexities is necessary to better recover the slip and surface displacements than the customary layered or uniform-crust solutions. These M(w)8.6 scenarios are the largest expected events based on historical records. Our algorithm images the Pinotepa earthquake rupture 18 min after the ground displacement data are downlinked from the satellite and processed in local machines, providing an alternative of evaluating the earthquake mechanism in addition to other seismological methods. The majority of fault slip (up to 1.2 m) is located over a gently dipping slab segment at a depth of similar to 21 km. These results illuminate the effectiveness and applicability of the proposed algorithm for real-time analyses, without compromising model accuracy to analytical solutions. |
英文关键词 | subduction earthquake rapid response geodetic analysis Green' s function finite element model Mexico megathrust |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462612900017 |
WOS关键词 | HIGH-RATE GPS ; COSEISMIC DEFORMATION ; AMATRICE EARTHQUAKE ; SURFACE DEFORMATION ; FAULT SLIP ; INSAR ; SENSITIVITIES ; INVERSIONS ; GEOMETRY ; GORKHA |
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/181607 |
专题 | 气候变化 |
作者单位 | 1.South Dakota Sch Mines & Technol, Dept Geol & Geol Engn, Rapid City, SD 57701 USA; 2.CALTECH, Jet Prop Lab, Pasadena, CA USA |
推荐引用方式 GB/T 7714 | Tung, S.,Fielding, E. J.,Bekaert, D. P. S.,et al. Rapid Geodetic Analysis of Subduction Zone Earthquakes Leveraging a 3-D Elastic Green's Function Library[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(5):2475-2483. |
APA | Tung, S.,Fielding, E. J.,Bekaert, D. P. S.,&Masterlark, T..(2019).Rapid Geodetic Analysis of Subduction Zone Earthquakes Leveraging a 3-D Elastic Green's Function Library.GEOPHYSICAL RESEARCH LETTERS,46(5),2475-2483. |
MLA | Tung, S.,et al."Rapid Geodetic Analysis of Subduction Zone Earthquakes Leveraging a 3-D Elastic Green's Function Library".GEOPHYSICAL RESEARCH LETTERS 46.5(2019):2475-2483. |
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