High-rate precise point positioning with a global positioning system (GPS) is recognized as a powerful tool for large earthquake monitoring. However, its ability to monitor subdaily subtle deformation is still limited by unmodeled errors, which primarily contain the common-mode error (CME) and multipath. In this study, a combination of modified principal component analysis and the sidereal filtering method is employed to separate and extract the CME and multipath from high-rate GPS displacements. The effectiveness of the proposed method is validated by processing 1 Hz GPS data at 131 static stations over 30 days, during which the 4 and 6 July 2019 Ridgecrest earthquakes occurred. The results show no obvious early afterslip within the first 5 h following the 6 July Mw 7.1 earthquake. The CME mainly consists of the first principal component and can be attributed to satellite orbit and clock errors. The proportion of the CME is higher than that of the multipath in the high-rate displacements, namely 36.7% versus 14.4%, 23.8% versus 18.1%, and 36.1% versus 12.5% for the east, north, and up components, respectively. By applying this method, the high-rate displacements can achieve precisions of 0.47, 0.50, and 1.60 cm in the three components. The results of the rapid fault-slip inversions indicate that the PPP fixed solution augmented with spatiotemporal filtering can improve fault-slip inversion and moment magnitude estimation and may lead to new findings for geophysics.

使用全球定位系统（GPS）进行高精度的点定位是公认的大型地震监测工具。但是，它监视次细微变形的能力仍然受到未建模误差的限制，该误差主要包含共模误差（CME）和多径。在这项研究中，结合使用改进的主成分分析和恒星滤波方法从高速GPS位移中分离并提取CME和多径。该方法的有效性通过在30天内处理131个静态站点的1 Hz GPS数据进行了验证，在此期间发生了2019年7月4日至6日的里奇克莱斯特地震。结果表明，在7月6日Mw 7.1地震发生后的最初5小时内，没有明显的早期滑移。CME主要由第一个主要成分组成，并且可以归因于卫星轨道和时钟误差。在高速率位移中，CME的比例高于多路径，分别为东部，北部和北部，分别为36.7％对14.4％，23.8％对18.1％，36.1％对12.5％。通过应用此方法，高速率位移可以在三个组件中实现0.47、0.50和1.60 cm的精度。快速断层滑动反演的结果表明，时空滤波增强的PPP固定解可以改善断层滑动反演和矩量估计，并可能为地球物理学带来新的发现。东部，北部和北部地区分别为7％对14.4％，23.8％对18.1％和36.1％对12.5％。通过应用此方法，高速率位移可以在三个组件中实现0.47、0.50和1.60 cm的精度。快速断层滑动反演的结果表明，时空滤波增强的PPP固定解可以改善断层滑动反演和矩量估计，并可能为地球物理学带来新的发现。东部，北部和北部地区分别为7％对14.4％，23.8％对18.1％和36.1％对12.5％。通过应用此方法，高速率位移可以在三个组件中实现0.47、0.50和1.60 cm的精度。快速断层滑动反演的结果表明，时空滤波增强的PPP固定解可以改善断层滑动反演和矩量估计，并可能为地球物理学带来新的发现。