Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity

Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity
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与海洋重力波活动相关的罗斯冰架冰震

DOI:
10.1029/2019gl084123
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发表时间:
2019
影响因子:
5.2
通讯作者:
Nyblade, A. A.
Nyblade, A. A.
中科院分区:
地球科学1区
文献类型:
--
作者:
Chen, Z.;Bromirski, P. D.;Gerstoft, P.;Stephen, R. A.;Lee, W. S.;Yun, S.;Olinger, S. D.;Aster, R. C.;Wiens, D. A.;Nyblade, A. A.

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重力波冲击冰架会产生一系列的反应,从而影响冰架的完整性。部署在罗斯冰架上的宽带地震仪,辅以近冰锋海底水听器,建立了强冰震活动与低于0.04 Hz的海洋重力波振幅(AG)的关联。罗斯冰架前缘地震垂直位移振幅(ASV)与AG有很好的相关性,从而可以估计重力波振幅到冰架前缘垂直位移振幅的频率相关传递函数(TGSV(f))。TGSV(f)在0.001-0.01 Hz时为0.6-0.7,但在较高频率时迅速下降。强冰震的地震活动表现出不同的重力波频段的空间和季节的关联,最强的冰震主要是在南极夏季海冰最小,膨胀的影响最强的时候在冰锋观察。
Gravity waves impacting ice shelves illicit a suite of responses that can affect ice shelf integrity. Broadband seismometers deployed on the Ross Ice Shelf, complemented by a near‐icefront seafloor hydrophone, establish the association of strong icequake activity with ocean gravity wave amplitudes (AG) below 0.04 Hz. The Ross Ice Shelf‐front seismic vertical displacement amplitudes (ASV) are well correlated withAG, allowing estimating the frequency‐dependent transfer function from gravity wave amplitude to icefront vertical displacement amplitude (TGSV(f)).TGSV(f) is 0.6–0.7 at 0.001–0.01 Hz but decreases rapidly at higher frequencies. Seismicity of strong icequakes exhibits spatial and seasonal associations with different gravity wave frequency bands, with the strongest icequakes observed at the icefront primarily during the austral summer when sea ice is minimal and swell impacts are strongest.
使用有限元方法计算冰架对波浪力的时域和模态响应
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