## 1 Introduction  
Located on the southeastern margin of the Tibetan Plateau, in the south-central part of the north-south seismic belt, and in the northern part of the eastern boundary of the Sichuan-Yunnan block, the Xianshuie Fault Zone (XSHFZ) is known for its high slip rate and frequent occurrence of strong earthquakes (Figure 1). The XSHFZ is a Holocene left-lateral strike-slip fault zone that plays an important role in studying tectonic deformation processes and dynamic mechanisms in the eastern Tibetan Plateau. There is still some controversy about the slip rate of the XSHFZ, as the slip rates reported in different studies vary widely. Geologically, the slip rate of the northwestern segment of the XSHFZ since the Late Quaternary has been estimated at 7-20 mm/yr based on various papers utilizinggeomorphologic features such as terraces and gullies along with chronological data [1; 2; 3; 4; 5; 6; 7; 8; 9; 10]. A relatively high slip rate as high as 30 mm/yr was reported by [PERSON] et al. [11]. The XSHFZ is segmented into three secondary faults--the Yalahe, Selaha, and Zheduotang faults--spanning from the south of the Huiyuan Temple basin to the south of Kangding. Slip rates in the northwestern segment of the XSHFZ are not evenly distributed across these three faults [4; 12]. Since the Late Quaternary, the horizontal slip rate of the Yalahe fault based on geologic methods is 1-3 mm/yr [4; 12], the slip rate of the Selaha fault is 5-10 mm/yr [5; 7; 8], and the slip rate of the Zheduotang fault is 3.6-6 mm/yr [8], while that of the segment south of the Kangding ranges from 5 to 9.1 \(\pm\) 2 mm/yr [1; 2; 4]. With the development of space-based Earth observation technology, the Global Navigation Satellite System (GNSS) and Interferometric Synthetic Aperture Radar (InSAR) techniques have been widely used to obtain the slip rate of the fault zone. Most of the slip rates given by GNSS and InSAR for the XSHFZ are 7-15 mm/yr [13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25]. Creeping movement on faults induces alterations in the stress state, subsequently impacting earthquake generation. The XSHFZ stands out as one of China's few fault zones exhibiting creep characteristics. Since [PERSON] et al. [1] first proposed the existence of shallow creep in the Luhuo-Daofu segment of the XSHFZ, there have been several studies on the creep characteristics of the fault zone [16; 26; 27; 28; 29; 30; 31]. [PERSON] et al. [26] obtained the dynamic evolution trajectory of the high-precision deformation field across the XSHFZ by utilizing two pairs of GPS continuous observation stations. This method reflected the unsteady deformation characteristics of the Daofu segment within the XSHFZ. [PERSON] et al. [27] analyzed the near-field deformation and slip changes of the Luhuo segment following the magnitude 7.6 earthquake in 1973. They discovered that the fault's slip rate was 10.27 mm/yr in the initial 5 years post-earthquake; however, this rate has progressively declined to 0.66-2.52 mm/yr since 1979. [PERSON] et al. [28] investigated the surface creep and fault slip rate of the northwestern segment of the XSHFZ by employing a short baseline and short-level measurements across the fault over recent decades. Their study revealed that the slip rate of the fault zone displays spatial and temporal variability. The high-spatial-resolution velocity field provided by InSAR can offer sufficient data support for studying the creep characteristics of the XSHFZ. [PERSON] et al. [29] and [PERSON] et al. [31] investigated the creep characteristics of the northwestern segment of the XSHFZ utilizing InSAR data. In contrast, [PERSON] and [PERSON] [30] analyzed the creep characteristics of the entire XSHFZ based on InSAR data. It is crucial to delineate the creep segments and quantify the magnitude of the creep slip rate in the XSHFZ to comprehend regional seismic hazards. Previous studies are mainly based on single sources to analyze the creep characteristics of the XSHFZ, and there are also studies fusing GNSS data, e.g., [PERSON] et al.