We present two new seismic velocity models for Alaska from joint inversions of body‐wave and ambient‐noise‐derived surface‐wave data, using two different methods. Our work takes advantage of data from many recent temporary seismic networks, including the Incorporated Research Institutions for Seismology Alaska Transportable Array, Southern Alaska Lithosphere and Mantle Observation Network, and onshore stations of the Alaska Amphibious Community Seismic Experiment. The first model primarily covers south‐central Alaska and uses body‐wave arrival times with Rayleigh‐wave group‐velocity maps accounting for their period‐dependent lateral sensitivity. The second model results from direct inversion of body‐wave arrival times and surface‐wave phase travel times, and covers the entire state of Alaska. The two models provide 3D compressional‐ (⁠VP⁠) and shear‐wave velocity (⁠VS⁠) information at depths ∼0–100 km⁠. There are many similarities as well as differences between the two models. The first model provides a clear image of the high‐velocity subducting plate and the low‐velocity mantle wedge, in terms of the seismic velocities and the VP/VS ratio. The statewide model provides clearer images of many features such as sedimentary basins, a high‐velocity anomaly in the mantle wedge under the Denali volcanic gap, low VP in the lower crust under Brooks Range, and low velocities at the eastern edge of Yakutat terrane under the Wrangell volcanic field. From simultaneously relocated earthquakes, we also find that the depth to the subducting Pacific plate beneath southern Alaska appears to be deeper than previous models.

中文翻译：

---

基于体波和面波数据的联合层析反演的阿拉斯加3D地震速度模型

我们使用两种不同的方法，根据体波和环境噪声衍生的面波数据的联合反演，提出了两个新的阿拉斯加地震速度模型。我们的工作利用了来自许多近期临时地震网络的数据，包括美国阿拉斯加可移动阵列地震学联合研究所，阿拉斯加南部岩石圈和地幔观测网络以及阿拉斯加两栖社区地震实验的陆上观测站。第一个模型主要涵盖阿拉斯加中南部，并使用瑞利波群速度图的体波到达时间，说明了它们的周期依赖性横向敏感性。第二个模型来自体波到达时间和表面波相位传播时间的直接反演，并涵盖了阿拉斯加的整个状态。这两个模型在0至100km⁠的深度提供3D压缩（VPVP）和横波速度（⁠VS⁠）信息。两种模型之间有很多相似之处和不同之处。第一个模型就地震速度和VP / VS比而言，提供了高速俯冲板和低速地幔楔的清晰图像。全州范围的模型提供了许多特征的更清晰图像，例如沉积盆地，Denali火山缝隙下的地幔楔中的高速异常，布鲁克斯山脉下的下地壳中的低VP以及下亚库塔特地貌的东部边缘的低速。兰格尔火山场。从同时发生的地震中，我们还发现，阿拉斯加南部俯冲太平洋板块的深度似乎比以前的模型还要深。