Abstract In order to study the present-day slip rate and crustal activity characteristic of the Kunlun fault, this paper derives a regional GPS velocity field from GPS observations in the Kunlun fault region using high-precision data-processing strategy, and it then estimates present-day deformation rates of the Kunlun fault based on GPS velocity profiles. The result indicates that present-day slip rates of the Kunlun fault near 94°E, 101°E and 103°E are 12.8±1.9 mm/a, 6.1±0.9 mm/a and 0.7±2.1 mm/a, respectively. Further study and analysis show the following conclusions: (1) The present-day slip rates on the 10-year timescale along the Kunlun fault estimated by this paper are consistent with the geological results on the 104 years timescale, implying that the present-day slip rates can be a useful input data set for the seismic hazard assessment; (2) The eastern Kunlun fault has an eastward-decreasing slip rate. We argue that the crustal thickening across Anyemaqen mountains and the clockwise rotation of the eastern Kunlun fault accommodate most of the decrease; (3) The Xidatan-Dongdatan seismic gap in the Kunlun fault lies in the high-strain region.
ZHENG Gang. The Use of Long-Term GPS Observations to Analyze Present-Day Slip Rate and Crustal Activity Characteristic of the Kunlun Fault[J]. jgg, 2019, 39(6): 557-561.
ZHENG Gang. The Use of Long-Term GPS Observations to Analyze Present-Day Slip Rate and Crustal Activity Characteristic of the Kunlun Fault[J]. jgg, 2019, 39(6): 557-561.