Using ~25 years of GPS and InSAR observations and the time‐dependent inversion filter, we invert for the volume change history of three active volcanoes in the east central Alaska Aleutian arc and the secular velocity of the region. The inferred time‐dependent volume change shows (1) two exponentially decaying pulses followed by a nearly linear inflation period at Westdahl volcano, (2) multiple episodic inflation events at Akutan volcano, and (3) transient volcanic inflation and long‐term deflation signals at Makushin volcano. Comparing our regional velocity estimates with recently published block models, we find a small signal that can be explained by slip deficit on the megathrust, either from a shallow (<20 km depth) almost fully locked zone or a weakly locked zone confined to 25–50 km depth.

中文翻译：

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阿拉斯加东阿留申弧中部火山岩浆供应的25年历史

利用约25年的GPS和InSAR观测资料以及随时间变化的反演滤波器，我们对阿拉斯加东部阿留申弧中部三个活火山的体积变化历史和该地区的长期速度进行了反演。推断的随时间变化的体积变化显示（1）两个指数衰减脉冲，随后是Westdahl火山的近乎线性的膨胀期，（2）Akutan火山发生了多次的周期性膨胀事件，以及（3）瞬时火山膨胀和长期放气信号在Makushin火山。将我们的区域速度估算值与最近发布的块状模型进行比较，我们发现了一个小信号，可以由巨型推力上的滑动赤字来解释，该信号来自浅的（<20 km深度）几乎完全锁定的区域，或者是局限于25-深度50公里。