GPS measurements of near‐field deformation along the southern Dead Sea Fault System
GPS measurements of near‐field deformation along the southern Dead Sea Fault System
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DOI：
10.1029/2011gc003736
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发表时间：
2011-12
期刊：
影响因子：
3.7
通讯作者：
Eid al Tarazi;J. Abu Rajab;F. Gomez;W. Cochran;R. Jaafar;M. Ferry
中科院分区：
文献类型：
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作者：
Eid al Tarazi;J. Abu Rajab;F. Gomez;W. Cochran;R. Jaafar;M. Ferry
通过对死海断裂带（DSF）南部沿着短期形变的分析，为这一部分大陆转换的运动学提供了系统的观点。南部DSF由两个主要部分组成：Wadi Araba和约旦谷断层。除了其他区域连续GPS数据外，本研究还使用了来自约旦25个调查点和4个连续GPS站的新数据，以改善近场观测。所报告的结果速度的1-σ不确定度范围为0.4-1.0 mm/年。弹性位错模型的应用产生的Wadi Araba和约旦谷断层的滑动速率估计分别为4.9 ± 0.4毫米/年和4.7 ± 0.4毫米/年。模拟还表明，Wadi Araba和约旦河谷断层的有效断层锁定深度不同，分别为15 ± 5 km和8 ± 5 km。这些滑动速率一般是一致的上限的范围内的滑动速率估计从晚第四纪地质。有效断层闭锁的空间变化一般与地幔岩石圈的不均匀性相对应。类似的观测结果也可沿沿着南圣安德烈亚斯断层观察到，这可能反映了上地幔的不均匀性对地壳断裂过程的影响。
Analysis of short‐term deformation along the southern part of Dead Sea Fault (DSF) provides a systematic view of kinematics this part of the continental transform. The southern DSF consists of two principal segments: the Wadi Araba and Jordan Valley faults. In addition to other regional continuous GPS data, this study uses new data from 25 survey sites and 4 continuous GPS stations in Jordan for improved near‐field observations. Resulting velocities are reported with 1‐σ uncertainties ranging from 0.4–1.0 mm/yr. Application of elastic dislocation models yields estimates of slip rates for Wadi Araba and Jordan Valley faults are 4.9 ± 0.4 mm/yr and 4.7 ± 0.4 mm/yr, respectively. Modeling also suggests different depths of effective fault locking with 15 ± 5 km and 8 ± 5 km for the Wadi Araba and Jordan Valley faults, respectively. These slip rates are generally consistent with the upper end of the range of slip rates estimated from late Quaternary geology. Spatial variations in effective fault locking generally correspond with a heterogeneous mantle lithosphere. A similar observation can be observed along the southern San Andreas Fault, and this may reflect the influence of heterogeneity in the uppermost mantle on crustal faulting processes.