确定南海和卡斯卡迪亚俯冲带锁定区和蠕动区的边界

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
E. M. Sherrill, K. M. Johnson, N. M. Jackson
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引用次数: 0

摘要

地震间耦合图,特别是相对于海沟、海岸线和慢滑事件的完全耦合(锁定)区位置的估计,对于确定俯冲带的特大山体地震危险至关重要。我们提出了一种地震间耦合反演方法,可以估算出锁定带的上下边界、深层过渡带的下边界以及下潜过渡带从锁定向自由蠕动过渡的蠕变速率梯度的位置。我们的研究表明,卡斯卡迪亚的锁定带位于海岸线以西,沿边缘大部分地区的慢滑带向下延伸 10 千米,在卡斯卡迪亚北部最宽(25-125 千米,延伸至 19 千米深处),在卡斯卡迪亚中部最窄(0-70 千米),其力矩累积率相当于 300 年和 500 年地震周期的 Mw 8.71 和 Mw 8.85 地震。我们发现紧靠锁定带下方的蠕变梯度很陡,表明整个边缘都在发生蠕变传播。在南海,我们发现了三个不同的锁定区(四国近海、纪伊半岛东南近海和志摩半岛近海),其总力矩累积率相当于 150 年地震周期发生一次 Mw 8.70 地震。在南海的三个锁定区域,锁定区的底部几乎都在海岸线之下,位于慢滑带的上坡 0-5 公里处。与卡斯卡迪亚形成对比的是,南海锁定区下方的蠕变速率梯度通常是渐变的,与静止锁定一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Locating Boundaries Between Locked and Creeping Regions at Nankai and Cascadia Subduction Zones

Interseismic coupling maps and, especially, estimates of the location of the fully coupled (locked) zone relative to the trench, coastline, and slow slip events are crucial for determining megathrust earthquake hazard at subduction zones. We present an interseismic coupling inversion that estimates the locations of the upper and lower boundaries of the locked zone, the lower boundary of the deep transition zone, and downdip gradient of creep rate in the transition from locked to freely creeping in the downdip transition zone. We show that the locked zone at Cascadia is west of the coastline and 10 km updip of the slow slip zone along much of the margin, widest (25–125 km, extending to ∼19 km depth) in northern Cascadia, narrowest (0–70 km) in central Cascadia, with moment accumulation rate equivalent to a Mw 8.71 and Mw 8.85 earthquake for 300- and 500-year earthquake cycles. We find a steep gradient in creep immediately below the locked zone, indicative of propagating creep, along the entire margin. At Nankai, we find three distinct zones of locking (offshore Shikoku, offshore southeast Kii peninsula, and offshore Shima peninsula) with a total moment accumulation rate equivalent to a Mw 8.70 earthquake for a 150-year earthquake cycle. The bottom of the locked zone is nearly under the coastline for all three locked regions at Nankai and is positioned 0–5 km updip of the slow slip zone. In contrast with Cascadia, creep rate gradients below the locked zone at Nankai are generally gradual, consistent with stationary locking.

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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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