The February 12, 2014, Ms7. 3, earthquake in Yutian, Xinjiang, China, occurred as a result of shallow strike-slip faulting in the tectonicaUy complex region of the northern Tibetan Plateau, with a depth of 17kin. This...The February 12, 2014, Ms7. 3, earthquake in Yutian, Xinjiang, China, occurred as a result of shallow strike-slip faulting in the tectonicaUy complex region of the northern Tibetan Plateau, with a depth of 17kin. This earthquake occurred several hundred kilometers north of the convergent India-Eurasia plate boundary. The epicenter location of the Yutian earthquake, 36. 1° N, 82. 5° E, is ll0km north of Yutian County, Hotan Prefecture. A large number of aftershocks from ML2. 0 to ML3. 0 occurred until 12：00 o＇clock, February 23, 2014 and the largest aftershock, Ms5. 7, occurred at 17：24 μm. , February 12, 2014. The b and h value of Yutian sequence are 0.70 and 1.29, respectively. The waiting time method reveals that the strong aftershocks above ML 4. 5 comply with a linear relationship, which is consistent with the characteristics of a mainshock-aftershock sequence. Furthermore, we calculate the source parameters and analyze the rupture process based on the empirical relationships for the Yutian earthquake, and the results indicate a frictional undershoot behavior in the dynamic source process of the Yutian earthquake, which is also in agreement with the lower and similar b values compared with the 2008 Ms 7.3 Yutian earthquake and the 2012 Ms 6. 2 Yutian earthquake.展开更多
In this paper, using the 1999 ~ 2007 GPS velocity field data, and by choosing the optimal block model, we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block bo...In this paper, using the 1999 ~ 2007 GPS velocity field data, and by choosing the optimal block model, we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block boundary faults on the mid-southern segment of the North-South Seismic Belt. The results show that： on the Longmenshan fault zone, the tensional and compressive slip rate is small on the Baoxing-Wenchuan segment, about 0. 5 ~ 1.8mm·a^-1, and the rate is relatively significant on the segment of the Wenchuan--Maoxian, as 1.8 ~3.8mm·a^-1; on the Xianshuihe fault belt, there is a certain difference in spatial distribution between the tensional slip rag.e and strike-slip rate： the tensional slip rate （ 8. lmm^a-1） is bigger than the sinistral strike-slip rate （ 4.8mm·a^-1） at the north of the Luhuo region; the tension and compression slip rate is basically the same as the strike-slip rate at Luhuo-Dawu; the Dawu-Kangding section presents a trend of decreased strike-slip rate and increased tensional slip rate; the Kangding-ghimian segment shows a strike-slip nature; the strike-slip rate is significantly greater than the tension/compression rate on the Xiaojiang fault zone; the slip rate on the Red River fault zone shows obvious spatial segmentation, the slip rate is smaller in its northwest part, but with a certain amount of tensional/compression component, 4. 7mm·a^-1 on the Jingdong segment. The segment east of Jingdong （ western Gejiu） is mainly of strike-slip, with a slip rate of 4. 5mm·a^-1.展开更多
基金supported by the National Natural Science Foundation of China ( 41404045)the Earthquake Tracing Task of China Earthquake Administration(2014020412)
文摘The February 12, 2014, Ms7. 3, earthquake in Yutian, Xinjiang, China, occurred as a result of shallow strike-slip faulting in the tectonicaUy complex region of the northern Tibetan Plateau, with a depth of 17kin. This earthquake occurred several hundred kilometers north of the convergent India-Eurasia plate boundary. The epicenter location of the Yutian earthquake, 36. 1° N, 82. 5° E, is ll0km north of Yutian County, Hotan Prefecture. A large number of aftershocks from ML2. 0 to ML3. 0 occurred until 12：00 o＇clock, February 23, 2014 and the largest aftershock, Ms5. 7, occurred at 17：24 μm. , February 12, 2014. The b and h value of Yutian sequence are 0.70 and 1.29, respectively. The waiting time method reveals that the strong aftershocks above ML 4. 5 comply with a linear relationship, which is consistent with the characteristics of a mainshock-aftershock sequence. Furthermore, we calculate the source parameters and analyze the rupture process based on the empirical relationships for the Yutian earthquake, and the results indicate a frictional undershoot behavior in the dynamic source process of the Yutian earthquake, which is also in agreement with the lower and similar b values compared with the 2008 Ms 7.3 Yutian earthquake and the 2012 Ms 6. 2 Yutian earthquake.
基金jointly sponsored by the National Key Technology R&D Program of the 12th "Five-year Plan" of PRC(2012BAK19B02)the Special Fund for Earthquake-related Scientific Research of China Earthquake Administration(201108009)the Youth Earthquake Regime Tracing Project for 2012(2012020212)
文摘In this paper, using the 1999 ~ 2007 GPS velocity field data, and by choosing the optimal block model, we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block boundary faults on the mid-southern segment of the North-South Seismic Belt. The results show that： on the Longmenshan fault zone, the tensional and compressive slip rate is small on the Baoxing-Wenchuan segment, about 0. 5 ~ 1.8mm·a^-1, and the rate is relatively significant on the segment of the Wenchuan--Maoxian, as 1.8 ~3.8mm·a^-1; on the Xianshuihe fault belt, there is a certain difference in spatial distribution between the tensional slip rag.e and strike-slip rate： the tensional slip rate （ 8. lmm^a-1） is bigger than the sinistral strike-slip rate （ 4.8mm·a^-1） at the north of the Luhuo region; the tension and compression slip rate is basically the same as the strike-slip rate at Luhuo-Dawu; the Dawu-Kangding section presents a trend of decreased strike-slip rate and increased tensional slip rate; the Kangding-ghimian segment shows a strike-slip nature; the strike-slip rate is significantly greater than the tension/compression rate on the Xiaojiang fault zone; the slip rate on the Red River fault zone shows obvious spatial segmentation, the slip rate is smaller in its northwest part, but with a certain amount of tensional/compression component, 4. 7mm·a^-1 on the Jingdong segment. The segment east of Jingdong （ western Gejiu） is mainly of strike-slip, with a slip rate of 4. 5mm·a^-1.
