Southern Alaska Lithosphere and Mantle Observation Network (SALMON): A Seismic Experiment Covering the Active Arc by Road, Boat, Plane, and Helicopter
Southern Alaska Lithosphere and Mantle Observation Network (SALMON): A Seismic Experiment Covering the Active Arc by Road, Boat, Plane, and Helicopter
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DOI：
10.1785/0220160229
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发表时间：
2017-07
影响因子：
3.3
通讯作者：
C. Tape;D. Christensen;M. Moore-Driskell;J. Sweet;Kyle Smith
中科院分区：
文献类型：
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作者：
C. Tape;D. Christensen;M. Moore-Driskell;J. Sweet;Kyle Smith
南阿拉斯加岩石圈和地幔观测网（SALMON）是在阿拉斯加南部俯冲带的库克湾地区部署的28个宽带、直接埋藏的孔后地震仪。在这里，我们描述了项目的目标、部署策略和站点设计。我们分析了18个SALMON监测站第一年数据的时间依赖性和频率依赖性地震噪声，其中11个在Cook Inlet盆地内，7个在盆地外。我们将SALMON台站的噪声与先前的四个地震台站、两个可移动阵列台站和一个全球地震台站进行了比较。场地类型，特别是地表基岩与沉积盆地，对所有周期的地震噪声水平影响最大，特别是对长周期（bbb20 s）的水平分量影响最大。SALMON台站记录的地震噪声和地震揭示了库克湾盆地地震波的放大。一次里氏7.1级地震的余震增加了当地地震目录，可用于库克湾地区复杂地震结构的震源反演和地震成像。
ABSTRACT The Southern Alaska Lithosphere and Mantle Observation Network (SALMON) is a deployment of 28 broadband, direct‐burial posthole seismometers in the Cook Inlet region of the southern Alaska subduction zone. Here we describe the objectives of the project, the deployment strategy, and station design. We analyze time‐dependent and frequency‐dependent seismic noise for the first year of data at 18 SALMON stations, 11 of which are inside Cook Inlet basin and 7 of which are outside the basin. We compare noise at the SALMON stations with four previous collocated seismic stations, two Transportable Array stations, and one Global Seismographic Network station. The type of site, notably surface bedrock versus sedimentary basin, has the strongest impact on seismic noise levels across all periods and especially on horizontal components at long periods (>20 s). Seismic noise and earthquakes recorded by SALMON stations reveal amplification of seismic waves in Cook Inlet basin. Aftershocks of an M w 7.1 intraslab earthquake augment a catalog of local earthquakes to be used for source inversions and seismic imaging of the complex seismic structure in the Cook Inlet region.