High‐Resolution Receiver Function Imaging Across the Cascadia Subduction Zone Using a Dense Nodal Array
High‐Resolution Receiver Function Imaging Across the Cascadia Subduction Zone Using a Dense Nodal Array
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DOI：
10.1029/2018gl079903
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发表时间：
2018-11
影响因子：
5.2
通讯作者：
K. Ward;F. Lin;B. Schmandt
中科院分区：
文献类型：
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作者：
K. Ward;F. Lin;B. Schmandt
2017年夏天，我们在Cascadia俯冲带弧前部署了174个节点检波器，具体目的是进行高分辨率接收函数研究。在俄勒冈州中部，间隔500米的密集沟槽垂直线记录了大约40天的连续数据。我们的板块构造尺度成像结果显示了与之前宽带地震部署相同的特征，包括俯冲的胡安德富卡板块顶部、莫霍板块和莫霍大陆。虽然我们的部署时间限制在40天左右，但密集的站点间隔使我们能够对俄勒冈州浅层的前弧进行非常详细的成像。在我们的浅层结果中，我们想象了一个持续的正向到达，我们将其解释为增加的西莱齐亚地形的顶部。我们建议，混合节点/宽带部署可以与海上地震研究相结合，以前所未有的细节成像俯冲带。
In the summer of 2017, we deployed 174 nodal geophones in the Cascadia Subduction Zone forearc with the specific aim of conducting a high‐resolution receiver function study. The dense trench perpendicular line in central Oregon with 500‐m spacing recorded continuous data for approximately 40 days. Our plate tectonic‐scale imaging results show the same features as previous broadband seismic deployments including the top of the subducting Juan de Fuca Plate, the slab Moho, and the continental Moho. Although our deployment was limited to around 40 days, the dense station spacing allowed us to image the shallow Oregon forearc in remarkable detail. In our shallow results, we image a continuous positive arrival that we interpret as the top of the accreted Siletzia terrane. We suggest that hybrid nodal/broadband deployments could be used in conjunction with offshore seismic studies to image subduction zones in unprecedented detail.