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Time-dependent inversion of three-component continuous GPS for steady and transient sources in northern Cascadia

机译:卡斯卡迪亚北部稳定和瞬变源的三分量连续GPS的时变反演

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摘要

An approach to invert GPS time series to estimate crustal block rotations, fault locking and strain rates while simultaneously solving for transient slow slip events is described and applied to the northern Cascadia subduction zone. The method can use continuous or survey mode GPS time series or both. I invert 5.6 years of 3-component continuous GPS time series at 53 sites from Cascadia to estimate simultaneously the block motions and strains, locking on the subduction zone and source parameters of the four most recent slow-slip events. Over the time period and section of the Cascadia margin sampled, the strain released in slow slip was 7 to 10% of the accumulated subduction strain but at the base of and immediately downdip of the locked zone beneath the Olympic Peninsula.
机译:描述了一种反转GPS时间序列以估算地块旋转,断层锁定和应变率,同时解决瞬态缓慢滑移事件的方法,该方法已应用于北部卡斯卡迪亚俯冲带。该方法可以使用连续或测量模式的GPS时间序列,也可以使用两者。我从卡斯卡迪亚(Cascadia)的53个地点倒转了5.6年的3分量连续GPS时间序列,以同时估算块体运动和应变,锁定了四个最近的慢滑事件的俯冲带和震源参数。在卡斯卡迪亚边缘的时间段和部分采样中,缓慢滑移释放的应变为累积俯冲应变的7%至10%,但位于奥林匹克半岛下方的锁定区域的底部并立即下倾。

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