Constant strain accumulation rate between major earthquakes on the North Anatolian Fault.
Constant strain accumulation rate between major earthquakes on the North Anatolian Fault.
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DOI：
10.1038/s41467-018-03739-2
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发表时间：
2018-04-11
影响因子：
16.6
通讯作者：
Hooper A
中科院分区：
文献类型：
--
作者：
Hussain E;Wright TJ;Walters RJ;Bekaert DPS;Lloyd R;Hooper A
地震是由两次地震之间积累的构造应变释放而引起的。卫星大地测量学的最新进展意味着我们现在可以高精度地测量这种震间应变积累。但是，在估计几个世纪以来积累的断层的地震危险性时，如何解释几十年来测量的短期大地测量观测结果仍然不清楚。在这里，我们表明，应变积累率计算的大地测量周围的主要转换断层是恒定的，其整个250年的地震间隔期，除了在地震后的10年。剪切应变率历史要求在粘性大于~1020 Pa·s的强下地壳中嵌入一个弱断裂带。结果支持的概念，短期大地测量观测可以直接有助于长期的地震危险性评估，并建议，来自震后研究的下地壳的粘度是不代表下地壳在所有的空间和时间尺度。地震间应变的积累现在可能受到卫星观测的限制。在这里，作者表明，应变积累率在北安纳托利亚断层是恒定的地震期间，表明较低的地壳粘度从震后研究是不具有代表性的。
Earthquakes are caused by the release of tectonic strain accumulated between events. Recent advances in satellite geodesy mean we can now measure this interseismic strain accumulation with a high degree of accuracy. But it remains unclear how to interpret short-term geodetic observations, measured over decades, when estimating the seismic hazard of faults accumulating strain over centuries. Here, we show that strain accumulation rates calculated from geodetic measurements around a major transform fault are constant for its entire 250-year interseismic period, except in the ~10 years following an earthquake. The shear strain rate history requires a weak fault zone embedded within a strong lower crust with viscosity greater than ~1020 Pa s. The results support the notion that short-term geodetic observations can directly contribute to long-term seismic hazard assessment and suggest that lower-crustal viscosities derived from postseismic studies are not representative of the lower crust at all spatial and temporal scales. Accumulation of interseismic strain may now be constrained by satellite observations. Here, the authors show that strain accumulation rates on the North Anatolian Fault are constant for the interseismic period indicating that lower-crustal viscosities from postseismic studies are not representative.
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影响因子：
16.6
作者：
通讯作者：
--
影响因子：
3.9
作者：
Bird, Peter;Carafa, Michele M. C.
通讯作者：
Carafa, Michele M. C.
影响因子：
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作者：
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通讯作者：
Bekaert, David P. S.
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作者：
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通讯作者：
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