## 1 Introduction  
The occurrence of tectonic earthquakes lies primarily in the movement of geological structures, which gives rise to the contradiction between the in situ stress and the resistance of rock strata [1]. The earthquake is the outcome of this contradiction. After an earthquake, the stress state of the Earth's crust will continue to adjust until a new equilibrium is reached [2]. It has also been verified that the state of in situ stress undergoes substantial changes before and after a major earthquake [3, 4, 5, 6, 7, 8]. Hence, it is of paramount significance to study the current tectonic stress field in key tectonic regions.  
The East Kunlun fault zone represents a vast left-lateral strike-slip active fault located in the northern region of the Tibetan Plateau. It stretches for approximately 1600 km, spanning from the west of Whaili Lake on the border between Qinghai and Xinjiang to the east of Maqu [3, 9, 10, 11]. In the western portion of the East Kunlun active fault, the Kusai Lake fault and the Xidatan fault constitute a miter complex [9]. The Quaternary activity of these two faults is intense and is closely correlated with potent and large earthquakes. The research findings suggest that the Kusai Lake fault and the Xidatan fault can rupture independently and simultaneously, resulting in moderate and strong earthquakes. The magnitude 8.1 earthquake occurred on the Kusai Lake fault on 14 November 2001 [12, 13, 14]. This indicates that the Kusai Lake fault possesses the activity pattern of large earthquakes of magnitude 8 or above. The displacement of the fault landform of the Xidatan fault also implies that the magnitude of the ancient earthquake is approximately 8, reflecting that these two sections have the capacity for recurrent strong earthquakes. Since approximately 20 ka BP, nearly all the paleoearthquakes of the Xidatan fault have occurred 70-500 years after the paleoearthquakes of the KusaiLake fault. After the magnitude 8.1 earthquake in 2001, the Xidatan fault has an elevated risk of strong earthquakes of approximately magnitude 8 within the next 70-100 years and constitutes a potential epicenter area for strong earthquakes in the northern Tibetan Plateau. The history of paleoseismicity in the East Kunlun fault zone holds significant importance for understanding the fracture characteristics and recurrence regularity of strong earthquakes [15]. [PERSON], [PERSON] et al. [3] compared and observed the alterations in in situ stress before and after the M8.1 earthquake in the East Kunlun Mountain Pass and discovered that approximately two-thirds of the in situ stress was released after the _Ms_ 8.1 earthquake (from May to July 2003). Nevertheless, the piezomagnetic stress relief method was utilized then, and the test depth was relatively shallow. Hence, more and deeper in situ stress data regions are required to study the current stress field characteristics in this area. From the perspective of in situ stress measurement, this paper analyzes the characteristics of in situ stress accumulation and seismic risk in the region, utilizing the stress states of four deep boreholes measured by the author and one borehole measured by previous researchers.