The Walker Lane (WL) in the western Great Basin (GB) is an active plate boundary system accommodating 10%–20% of the relative tectonic motion between the Pacific and North American plates. Its neotectonic framework is structurally complex, having hundreds of faults with various strikes, rakes, and crustal blocks with vertical axis rotation. Faults slip rates are key parameters needed to quantify seismic hazard in such tectonically active plate boundaries but modeling them in complex areas like the WL and GB is challenging. We present a new modeling strategy for estimating fault slip rates in complex zones of active crustal deformation using data from GPS networks. The technique does not rely on prior estimates of slip rates from geologic studies, and only uses data on the surface trace location, dip, and rake. The iterative framework generates large numbers of block models algorithmically from the fault database to obtain many estimates of slip rates for each fault. This reduces bias from subjective choices about how discontinuous faults connect and interact to accommodate strain. Each model iteration differs slightly in block boundary configuration, but all models honor geodetic and fault data, regularization, and are kinematically self-consistent. The approach provides several advantages over bespoke models, including insensitivity to outlier data, realistic uncertainties, explicit mapping of off-fault deformation, and slip rates that are more objective and independent of geologic slip rates. Comparisons to the U.S. National Seismic Hazard Model indicate that ∼80% of our geodetic slip rates agree with their geologic slip rates to within uncertainties.

中文翻译：

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使用多块模型方法根据 GPS 数据对 Walker Lane 和西部大盆地的断层滑动率进行鲁棒成像

大盆地 (GB) 西部的沃克莱恩 (WL) 是一个活跃的板块边界系统，容纳了太平洋板块和北美板块之间 10%–20% 的相对构造运动。其新构造格局结构复杂，有数百条走向、倾角各异的断层，以及垂直轴旋转的地壳块体。断层滑移率是量化此类构造活动板块边界地震灾害所需的关键参数，但在 WL 和 GB 等复杂区域对其进行建模具有挑战性。我们提出了一种新的建模策略，利用 GPS 网络的数据来估计活动地壳变形复杂区域的断层滑动率。该技术不依赖于地质研究中对滑移率的预先估计，仅使用有关表面痕迹位置、倾角和倾角的数据。迭代框架通过算法从故障数据库生成大量块模型，以获得每个故障滑移率的许多估计。这减少了关于不连续断层如何连接和相互作用以适应应变的主观选择的偏差。每个模型迭代在块边界配置方面略有不同，但所有模型都遵循大地测量和断层数据、正则化，并且在运动学上是自洽的。与定制模型相比，该方法具有多种优势，包括对异常数据不敏感、现实的不确定性、断层变形的明确映射以及更客观且独立于地质滑移率的滑移率。与美国国家地震灾害模型的比较表明，约 80% 的大地测量滑移率与其地质滑移率一致，且在不确定性范围内。