鲜水河断裂及两侧地块的GPS监测
GPSM onitoring ofX ianshuihe Fault and Blocks on Its Both Sides
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摘要: 对鲜水河断裂及两侧地块的GPS观测,得到欧亚框架下运动速度场.基于得到的运动速度,采用刚性地 块假设下的最小二乘拟合方法,得到川滇地块与川青地块的运动速度分别为19. 5±3. 4和13. 2±3. 4 mm /a,川 滇地块相对川青地块的运动速度为8. 3±3. 4mm /a,鲜水河断裂的运动速度为7. 9~8. 8mm /a(甘孜—乾宁段为 8. 8±3. 5 mm /a,乾宁—康定段为7. 9±3. 3 mm /a).上述研究结果表明,鲜水河断裂、川滇地块与川青地块所围 成的区域为重要构造活动区.Abstract: Based on the GPS measurement of the Xianshuihe fault and blocks on its both sides, Chuan-Dian block and Chuan-Qing block, a velocity field on the Eurasia reference frame was obtained. The movement velocities ofGPS stations in the region were estimated using least-squares fitting under the hypotheses of rigidmass. The fitting result shows that themovementvelocities of the Chuan-Dian and Chuan-Qing blocks are 19. 5±3. 4 and 13. 2±3. 4 mm/a respectively, and the Chuan-Qing block moves at a speed of 8. 3±3. 4 mm/a relative to the Chuan-Qing block. The movementvelocity of the Xianshuihe fault is 7. 9 to 8. 8 mm/a( it is 8. 8±3. 5 mm/a in Garzê- Qianning segment and 7. 9±3. 3 mm/a in Qianning-Kangdin segment). The above results show that the region covered the Xianshuihe faul,t the Chuan-Dian and Chuan-Qing blocks is an important tectonic activity zone.
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Key words:
- blockmovement /
- Xianshuihe fault fault activity /
- GPS /
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