Collaborative Research: Is the Holocene Slip Rate along the Altyn Tagh Fault 10 mm/y, 30 mm/y, or Both? Infilling a 2-6 ka Data Gap Using 14C, OSL, and Stream Reconstructions
合作研究:阿尔金断裂带全新世滑移率是10毫米/年、30毫米/年还是两者?
基本信息
- 批准号:0610107
- 负责人:
- 金额:$ 25.52万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2006
- 资助国家:美国
- 起止时间:2006-08-01 至 2013-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The active, left-slip Altyn Tagh Fault extends for over 1200 km along the northwestern margin of the Tibetan Plateau, making it a first-order structure within the Indo-Asian collision. Measuring the Holocene slip rate along the Altyn Tagh Fault is essential for both advancing understanding of the mechanical behavior of major intracontinental fault systems and discriminating between conflicting rheological models of the Asian crust and lithosphere. Previous work has produced two contradictory slip rates for the central portion of the fault: GPS and paleoseismological studies give rates of about 10mm/y between 0.01 and 2-3 thousand years ago whereas geomorphic reconstructions yield rates of approximately 30 mm/yr between 6 and 113 thousand years ago. There is an important temporal gap in slip-rate data between 2 and 6 thousand years ago that may be explained by: (1) slip rate variations by a factor of three over a few thousand years; (2) constant and slow (about 10 mm/yr) slip rate in time; or (3) constant and fast (about 30mm/yr) slip rate in time. This three-year, integrated paleoseismic and slip-rate study along the central Altyn Tagh fault will distinguish between these three hypothesized slip histories for the 2 to 6 thousand year gap. Paleoseismological studies characterize the size, age, offset and magnitude of the most-recent surface-breaking ruptures. Slip rates are determined by reconstructing displaced fluvial terrace risers at six new sites. Displaced fluvial terraces are being measured and dated using radiocarbon, optically stimulated luminescence, and cosmongenic radionuclide methods. Establishing the Holocene slip history along the Altyn Tagh Fault is important for determining if Asia is best viewed as a collage of microplates or a thin viscous sheet.The Altyn Tagh Fault, the largest active strike-slip fault within the Indo-Asian collision, plays a central role in a long-standing debate over the deformational behavior of the Eurasian continent and, by implication, continents in general. At the heart of this debate lies a dispute over the rate at which the fault moved during the last 10,000 years. The results from this investigation will (1) resolve the disputed slip rate and allow distinction between the diffuse and localized continental deformation models; (2) provide observational constraints for models of intracontinental fault dynamics; and (3) improve understanding of the seismic risk to growing population centers near the Altyn Tagh Fault.
阿尔金-塔格活动左滑断裂沿青藏高原西北缘延伸1200多公里,是印亚碰撞中的一级构造。阿尔金断裂全新世滑动速率的测量对于加深对大陆内主要断裂系统的力学行为的认识以及区分相互冲突的亚洲地壳和岩石圈的流变模型都是至关重要的。以前的工作给出了断层中央的两个相互矛盾的滑动速率:GPS和古地震学研究给出了0.01年前和2-3000年前之间大约10毫米/年的滑动速率,而地貌重建在6000年到113 000年前之间的滑动速率大约为30毫米/年。在两千年到六千年前的滑移率数据中存在着一个重要的时间间隔,这可以用以下几个方面来解释:(1)几千年来滑移率变化三倍;(2)时间上滑移率恒定而缓慢(约10毫米/年);(3)时间上滑移率恒定而快速(约30毫米/年)。这项沿阿尔金断裂中央进行的为期三年的综合古地震和滑动速率研究将区分这三种假想的两千到六千年间的滑动历史。古地震学研究确定了最近地表破裂的大小、年龄、偏移量和震级。滑移率是通过在六个新地点重建置换的河流阶地立管来确定的。移位的河流阶地正在用放射性碳法、光激发发光法和宇宙源放射性核素法进行测量和年代测定。建立沿阿尔金断裂的全新世滑移史对于确定亚洲是微板块的拼贴还是粘性薄片的最佳选择具有重要意义。阿尔金断裂是印度支那-亚洲碰撞中最大的活动走滑断裂,在关于欧亚大陆乃至整个大陆变形行为的长期争论中发挥着核心作用。这场辩论的核心是关于断层在过去1万年中移动的速度的争议。这项调查的结果将(1)解决有争议的滑动速率,并允许区分扩散和局部大陆变形模型;(2)为陆内断裂动力学模型提供观测约束;以及(3)提高对阿尔金断裂附近不断增长的人口中心的地震风险的理解。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Eric Cowgill其他文献
Interactive Visualization to Advance Earthquake Simulation
- DOI:
10.1007/s00024-008-0317-9 - 发表时间:
2008-05-14 - 期刊:
- 影响因子:1.900
- 作者:
Louise H. Kellogg;Gerald W. Bawden;Tony Bernardin;Magali Billen;Eric Cowgill;Bernd Hamann;Margarete Jadamec;Oliver Kreylos;Oliver Staadt;Dawn Sumner - 通讯作者:
Dawn Sumner
Impact of rift history on the structural style of intracontinental rift-inversion orogens
裂谷历史对陆内裂谷反转造山带构造样式的影响
- DOI:
10.1130/g51489.1 - 发表时间:
2024 - 期刊:
- 影响因子:5.8
- 作者:
Dylan A. Vasey;J. Naliboff;Eric Cowgill;Sascha Brune;A. Glerum;Frank Zwaan - 通讯作者:
Frank Zwaan
Relocation of the Seismicity of the Caucasus Region
高加索地区地震活动的重新定位
- DOI:
10.1785/0120230155 - 发表时间:
2023 - 期刊:
- 影响因子:3
- 作者:
István Bondár;T. Godoladze;Eric Cowgill;G. Yetirmishli;Stephen C. Myers;I. Gunia;A. Buzaladze;Barbara Czecze;Tuna Onur;R. Gök;Andrea Chiang - 通讯作者:
Andrea Chiang
The Mojave Section of the San Andreas Fault (California): 1. Shaping the Terrace Stratigraphy of Little Rock Creek Through the Competition Between Rapid Strike‐Slip Faulting and Lateral Stream Erosion Over the Last 40 k.y.
圣安德烈亚斯断层的莫哈维断层(加利福尼亚州):1.通过过去 40 年快速走滑断层与侧流侵蚀之间的竞争塑造小石溪台地地层。
- DOI:
10.1029/2023gc010869 - 发表时间:
2023 - 期刊:
- 影响因子:3.7
- 作者:
A. Moulin;Eric Cowgill;Katherine Scharer;Devin McPhilipps;Arjun Heimsath - 通讯作者:
Arjun Heimsath
Kura (Mtkvari) River terraces record fluvial response to the collision of the Greater and Lesser Caucasus thrust belts, Georgia
库拉(姆茨赫塔河)河阶地记录了格鲁吉亚大高加索和小高加索逆冲带碰撞所引起的河流响应。
- DOI:
10.1016/j.geomorph.2025.109656 - 发表时间:
2025-05-01 - 期刊:
- 影响因子:3.300
- 作者:
Giorgi Boichenko;Eric Cowgill;Tea Godoladze;Timothy A. Stahl;Salome Gogoladze;Giorgi Merebashvili;Avtandil Okrostsvaridze;Raymond Torres;Steven Binnie;Benedikt Ritter - 通讯作者:
Benedikt Ritter
Eric Cowgill的其他文献
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{{ truncateString('Eric Cowgill', 18)}}的其他基金
Collaborative Research: From subduction to suture: testing collisional stage and lithospheric strength as controls on orogenic structure in the Caucasus
合作研究:从俯冲到缝合:测试碰撞阶段和岩石圈强度作为高加索造山结构的控制
- 批准号:
2050623 - 财政年份:2021
- 资助金额:
$ 25.52万 - 项目类别:
Standard Grant
Collaborative Research: A Structural, Thermochronologic, and Provenance Investigation of a Hypothesized Transition From Subduction to Slab Breakoff in the Greater Caucasus
合作研究:对大高加索地区从俯冲到板块断裂的假设转变的结构、热年代学和起源调查
- 批准号:
1524631 - 财政年份:2015
- 资助金额:
$ 25.52万 - 项目类别:
Continuing Grant
Does the Holocene Slip History for the Mojave Section of the San Andreas Fault Indicate Secular Variation in Slip and a Discrepancy with Geodetic Rates?
圣安德烈亚斯断层莫哈韦断层的全新世滑动历史是否表明滑动的长期变化以及与大地测量速率的差异?
- 批准号:
1220588 - 财政年份:2012
- 资助金额:
$ 25.52万 - 项目类别:
Standard Grant
Collaborative Research: Magnitude and timing of shortening in the Greater Caucasus: Locus of Late Cenozoic Arabia-Eurasia convergence?
合作研究:大高加索地区缩短的幅度和时间:晚新生代阿拉伯-欧亚大陆交汇的地点?
- 批准号:
0810285 - 财政年份:2008
- 资助金额:
$ 25.52万 - 项目类别:
Continuing Grant
How Do Intracontinental Faults Terminate? The Altyn Tagh Fault and Its Connection With a Possible S-Directed Backthrust System in Western Tibet as a Type Example
陆内断层如何终止?
- 批准号:
0310415 - 财政年份:2003
- 资助金额:
$ 25.52万 - 项目类别:
Standard Grant
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