New Constraints on Slip Deficit on the Aleutian Megathrust and Inflation at Mt. Veniaminof, Alaska From Repeat GPS Measurements
New Constraints on Slip Deficit on the Aleutian Megathrust and Inflation at Mt. Veniaminof, Alaska From Repeat GPS Measurements
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DOI：
10.1029/2020gl091787
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发表时间：
2021-02-28
影响因子：
5.2
通讯作者：
Freymueller, Jeffrey T.
中科院分区：
文献类型：
--
作者：
Drooff, Connor;Freymueller, Jeffrey T.
我们利用全球定位系统(GPS)速度的增强数据集来重新评估阿拉斯加-阿留申俯冲带板块界面上的滑动赤字。对阿拉斯加半岛西南部维尼亚米诺夫山附近场地的速度研究表明，现有的构造变形模型不能准确预测半岛这一段的局部速度场。在一个组合模型中，我们求解了山顶上的火山膨胀信号。并重新评估了火山外侧沟槽连接的变化。维尼亚米诺夫和东部舒马金群岛附近的地震间变形需要一个额外的模型段，其滑动赤字比西部舒马金群岛更高。这一段似乎是2020年里氏7.9级地震的主破裂带。该火山在2005-2017年期间膨胀，尽管膨胀速度低于2002-2005年。
We employ an enhanced data set of Global Positioning System (GPS) velocities to reassess the slip deficit along the plate interface of the Alaska-Aleutian subduction zone. An examination of velocities of sites near Mt Veniaminof, located in the southwest Alaska Peninsula, shows that existing models for tectonic deformation do not accurately predict the local velocity field along this section of the peninsula. In a combined model, we solve for the volcanic inflation signal on the edifice of Mt. Veniaminof and reassess the variations in trench coupling outboard of the volcano. The interseismic deformation near Veniaminof and the eastern Shumagin islands requires an additional model segment with higher slip deficit than the western Shumagin islands. This segment appears to have been the main rupture patch of the 2020 M 7.9 Simeonof earthquake. The volcano inflated over the time period of 2005-2017, although at a lower rate than in 2002-2005.