Teleseismic earthquake wavefields observed on the Ross Ice Shelf
Teleseismic earthquake wavefields observed on the Ross Ice Shelf
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在罗斯冰架上观测到的远震地震波场
DOI：
10.1017/jog.2020.83
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发表时间：
2021
影响因子：
3.4
通讯作者：
Stephen, Ralph A.
中科院分区：
文献类型：
--
作者：
Baker, Michael G.;Aster, Richard C.;Wiens, Douglas A.;Nyblade, Andrew;Bromirski, Peter D.;Gerstoft, Peter;Stephen, Ralph A.
Observations of teleseismic earthquakes using broadband seismometers on the Ross Ice Shelf (RIS) must contend with environmental and structural processes that do not exist for land-sited seismometers. Important considerations are: (1) a broadband, multi-mode ambient wavefield excited by ocean gravity wave interactions with the ice shelf; (2) body wave reverberations produced by seismic impedance contrasts at the ice/water and water/seafloor interfaces and (3) decoupling of the solid Earth horizontal wavefield by the sub-shelf water column. We analyze seasonal and geographic variations in signal-to-noise ratios for teleseismic P-wave (0.5–2.0 s), S-wave (10–15 s) and surface wave (13–25 s) arrivals relative to the RIS noise field. We use ice and water layer reverberations generated by teleseismic P-waves to accurately estimate the sub-station thicknesses of these layers. We present observations consistent with the theoretically predicted transition of the water column from compressible to incompressible mechanics, relevant for vertically incident solid Earth waves with periods longer than 3 s. Finally, we observe symmetric-mode Lamb waves generated by teleseismic S-waves incident on the grounding zones. Despite their complexity, we conclude that teleseismic coda can be utilized for passive imaging of sub-shelf Earth structure, although longer deployments relative to conventional land-sited seismometers will be necessary to acquire adequate data.
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影响因子：
5.2
作者：
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DOI：
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期刊：
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发表时间：
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DOI：
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发表时间：
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期刊：
影响因子：
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影响因子：
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