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科学家首次捕捉到慢滑地震发生的全过程 快报文章
地球科学快报,2025年第13期
作者:  张树良
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:396/0  |  提交时间:2025/07/10
slow-motion earthquake  Nankai Fault  borehole sensors  Cascadia Fault  
海山下沉为解释慢滑地震提供了新线索 快报文章
地球科学快报,2023年第13期
作者:  王晓晨
Microsoft Word(14Kb)  |  收藏  |  浏览/下载:585/0  |  提交时间:2023/07/10
Sinking seamount  slow motion earthquakes  
科学家发现早期板块运动和地磁极翻转的最新证据 快报文章
地球科学快报,2022年第21期
作者:  王晓晨
Microsoft Word(14Kb)  |  收藏  |  浏览/下载:680/0  |  提交时间:2022/11/10
Plate motion  geomagnetic poles flipping  
大陆板块运动放缓控制火山事件 快报文章
地球科学快报,2022年第18期
作者:  王晓晨
Microsoft Word(15Kb)  |  收藏  |  浏览/下载:675/0  |  提交时间:2022/09/25
Plate motion  Volcanism  
新研究指出“世界屋脊”似乎已经上升了 600 米 快报文章
地球科学快报,2021年第11期
作者:  王立伟
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:83/0  |  提交时间:2021/06/10
Tibetan Plateau  plate-motion  
Arc-Type Magmatism Due to Continental-Edge Plowing Through Ancient Subduction-Enriched Mantle 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  van Hinsbergen, Douwe J. J.;  Spakman, Wim;  de Boorder, Hugo;  Van Dongen, Michiel;  Jowitt, Simon M.;  Mason, Paul R. D.
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
subduction  tomography  absolute plate motion  magmatism  plate reconstruction  
Months-long thousand-kilometre-scale wobbling before great subduction earthquakes 期刊论文
NATURE, 2020, 580 (7805) : 628-+
作者:  Son, Hyungmok;  Park, Juliana J.;  Ketterle, Wolfgang;  Jamison, Alan O.
收藏  |  浏览/下载:31/0  |  提交时间:2020/05/13

Observed reversals in GNSS surface motions suggests greatly enhanced slab pull in the months preceding the great subduction earthquakes in Maule (Chile, 2010) and Tohoku-oki (Japan, 2011) of moment magnitudes 8.8 and 9.0.


Megathrust earthquakes are responsible for some of the most devastating natural disasters(1). To better understand the physical mechanisms of earthquake generation, subduction zones worldwide are continuously monitored with geophysical instrumentation. One key strategy is to install stations that record signals from Global Navigation Satellite Systems(2,3) (GNSS), enabling us to track the non-steady surface motion of the subducting and overriding plates before, during and after the largest events(4-6). Here we use a recently developed trajectory modelling approach(7) that is designed to isolate secular tectonic motions from the daily GNSS time series to show that the 2010 Maule, Chile (moment magnitude 8.8) and 2011 Tohoku-oki, Japan (moment magnitude 9.0) earthquakes were preceded by reversals of 4-8 millimetres in surface displacement that lasted several months and spanned thousands of kilometres. Modelling of the surface displacement reversal that occurred before the Tohoku-oki earthquake suggests an initial slow slip followed by a sudden pulldown of the Philippine Sea slab so rapid that it caused a viscoelastic rebound across the whole of Japan. Therefore, to understand better when large earthquakes are imminent, we must consider not only the evolution of plate interface frictional processes but also the dynamic boundary conditions from deeper subduction processes, such as sudden densification of metastable slab.


  
Calving Seasonality Associated With Melt-Undercutting and Lake Ice Cover 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (8)
作者:  Mallalieu, Joseph;  Carrivick, Jonathan L.;  Quincey, Duncan J.;  Smith, Mark W.
收藏  |  浏览/下载:14/0  |  提交时间:2020/07/02
calving  glacial lake  Greenland  outburst flood  structure-from-motion  time-lapse  
Strong-Motion Seismogeodesy by Deeply Coupling GNSS Receivers with Inertial Measurement Units 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (8)
作者:  Geng, Jianghui;  Wen, Qiang;  Zhang, Tisheng;  Li, Chenghong
收藏  |  浏览/下载:19/0  |  提交时间:2020/07/02
Seismogeodesy  High-rate GNSS  Strong-motion seismology  Phase-lock loop  Six-degree-of-freedom  
Electromechanical coupling in the hyperpolarization-activated K+ channel KAT1 期刊论文
NATURE, 2020, 583 (7814) : 145-+
作者:  Jin, Zhenming;  Du, Xiaoyu;  Xu, Yechun;  Deng, Yongqiang;  Liu, Meiqin;  Zhao, Yao;  Zhang, Bing;  Li, Xiaofeng;  Zhang, Leike;  Peng, Chao;  Duan, Yinkai;  Yu, Jing;  Wang, Lin;  Yang, Kailin;  Liu, Fengjiang;  Jiang, Rendi;  Yang, Xinglou;  You, Tian;  Liu, Xiaoce
收藏  |  浏览/下载:52/0  |  提交时间:2020/07/03

Voltage-gated potassium (K-v) channels coordinate electrical signalling and control cell volume by gating in response to membrane depolarization or hyperpolarization. However, although voltage-sensing domains transduce transmembrane electric field changes by a common mechanism involving the outward or inward translocation of gating charges(1-3), the general determinants of channel gating polarity remain poorly understood(4). Here we suggest a molecular mechanism for electromechanical coupling and gating polarity in non-domain-swapped K-v channels on the basis of the cryo-electron microscopy structure of KAT1, the hyperpolarization-activated K-v channel from Arabidopsis thaliana. KAT1 displays a depolarized voltage sensor, which interacts with a closed pore domain directly via two interfaces and indirectly via an intercalated phospholipid. Functional evaluation of KAT1 structure-guided mutants at the sensor-pore interfaces suggests a mechanism in which direct interaction between the sensor and the C-linker hairpin in the adjacent pore subunit is the primary determinant of gating polarity. We suggest that an inward motion of the S4 sensor helix of approximately 5-7 angstrom can underlie a direct-coupling mechanism, driving a conformational reorientation of the C-linker and ultimately opening the activation gate formed by the S6 intracellular bundle. This direct-coupling mechanism contrasts with allosteric mechanisms proposed for hyperpolarization-activated cyclic nucleotide-gated channels(5), and may represent an unexpected link between depolarization- and hyperpolarization-activated channels.


The cryo-electron microscopy structure of the hyperpolarization-activated K+ channel KAT1 points to a direct-coupling mechanism between S4 movement and the reorientation of the C-linker.