Fault slip rates estimated from geodetic data are being integrated into seismic hazard models. The standard approach requires modeling velocities and relative (micro-)plate motions, which is challenging for fault-based models. We present a new approach to directly invert strain rates to solve for slip rates and distributed strain simultaneously. We generate velocity and strain rate fields over the southeastern Tibetan Plateau, utilizing Sentinel-1 Interferometric Synthetic Aperture Radar data spanning 2014–2023. We derive slip rates using block modeling and by inverting strain rates. Our results show a partitioning between localized strain on faults and distributed deformation. The direct inversion of strain rates matches the geodetic data best when incorporating distributed moment sources, accounting for a similar proportion to on-fault sources. The direct strain methodology also aligns best with the independent geological slip rates, especially near fault tips. As high-resolution strain rate fields become increasingly available, we recommend direct inversion as the preferred practice.

中文翻译：

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基于高分辨率 Sentinel-1 InSAR 和 GNSS 运动学建模的青藏高原东南部应变分区


根据大地测量数据估计的断层滑移率正在集成到地震危险模型中。标准方法需要对速度和相对（微）板运动进行建模，这对于基于故障的模型来说是一个挑战。我们提出了一种直接反转应变率的新方法，以同时求解滑移率和分布应变。我们利用 2014-2023 年的 Sentinel-1 干涉合成孔径雷达数据，在青藏高原东南部生成速度和应变速率场。我们使用块建模和反转应变率来推导出滑移率。我们的结果表明，断层上的局部应变和分布式变形之间存在分区。当包含分布式弯矩源时，应变率的直接反演与大地测量数据最匹配，与断层源的比例相似。直接应变方法也与独立的地质滑移率最一致，尤其是在断层尖端附近。随着高分辨率应变率场的日益普及，我们建议将直接反演作为首选做法。