Workshop 2018
Gang Zheng - Crustal deformation in the Kunlun Fault region from long-term GPS measurements - October 29, 2018 • 501 Views
We derive a GPS velocity field with high temporal-spatial resolution covering the Kunlun Fault and its surroundings. Based on this velocity field, we find that the present-day slip rates of the Kunlun Fault near 94°E, 101°E and 103°E are 12.8±1.9, 6.1±0.9 and 0.7±2.1 mm/yr, respectively. These GPS results on the 10-year timescale are consistent with the long-term geological slip rates on the 10 4 -year timescale, implying that the present-day slip rates can be a useful input data set for the seismic hazard assessment. The eastern Kunlun Fault has an eastward-decreasing slip rate, consistent with the suggestion that the fault propagates eastward. We argue that the crustal thickening across the Anyemaqen Shan and the clockwise rotation of the eastern Kunlun Fault accommodate the eastward decrease in the slip rate. The Xidatan-Dongdatan segment of the fault is regarded as a seismic gap and completely lies in the high-strain region, thus it is undergoing high earthquake risk.

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