A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west co...A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves,the predominant tidal phases of the earthquake are- 5. 86°,6. 60° and- 15. 52°,and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves( the north-south,east-west component of the tidal force and tidal body stress),the p S of Schusters test for all the earthquakes is 10. 52%,2. 40% and 2. 06%,and the p P of the Permutation test is 10. 90%,2. 40% and 2. 06%,and the results of p S and p P based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale,both the p S and p P are very low( close to 0),far below the threshold of 0. 05 of tidal triggering of earthquakes,and the predominant tidal phase for earthquake triggering is- 18. 95°,close to the maximum 0°( new moon and full moon) of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes,a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction.展开更多
流体运移时携带热量,会产生温度变化.温度作为地下流体的示踪剂得到了广泛应用,但通常需要事先确定热扩散系数.实际上,基于浅层地壳不同深度的周期性温度-时间序列,利用流体运动对振幅和相位的影响,可以同步获取热扩散系数和地下流体运...流体运移时携带热量,会产生温度变化.温度作为地下流体的示踪剂得到了广泛应用,但通常需要事先确定热扩散系数.实际上,基于浅层地壳不同深度的周期性温度-时间序列,利用流体运动对振幅和相位的影响,可以同步获取热扩散系数和地下流体运移信息.本文以新疆喀什地区5个钻孔不同深度的基岩温度数据为基础,获取了热扩散系数和流体运移特征.主要成果有:(1)获得了不同测点的热扩散系数α,以及视热扩散系αA和αΦ(即单独通过振幅或相位获得的热扩散系数).其中,α、αA和αΦ的值分别为1.52~8.91、0.79~1.71和(1.53~33.1)×10^(-6) m 2·s^(-1).另外,当流体热效应不明显时,通过相位获得的视热扩散系αΦ更接近真实的热扩散系数α.(2)获得了不同测点的流体流向和流速信息.测点的流体流向均向上,靠近天山地区的测点流体流速为(0.10~1.94)×10^(-7) m·s^(-1),靠近昆仑山地区的测点流体流速为(8.56~9.71)×10^(-7) m·s^(-1),不同地区测点流体流速的差异可能与区域水文地质环境有关.总之,通过多深度的连续基岩温度观测,有望获得浅层地壳的热扩散系数及流体运移特征.展开更多
基金sponsored by the Earthquake Situation Tracking Task of 2013(2013020119)the Fund of Earthquake Administration of Xinjiang Uygur Autonomous Region,China(201304)
文摘A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves,the predominant tidal phases of the earthquake are- 5. 86°,6. 60° and- 15. 52°,and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves( the north-south,east-west component of the tidal force and tidal body stress),the p S of Schusters test for all the earthquakes is 10. 52%,2. 40% and 2. 06%,and the p P of the Permutation test is 10. 90%,2. 40% and 2. 06%,and the results of p S and p P based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale,both the p S and p P are very low( close to 0),far below the threshold of 0. 05 of tidal triggering of earthquakes,and the predominant tidal phase for earthquake triggering is- 18. 95°,close to the maximum 0°( new moon and full moon) of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes,a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction.
文摘流体运移时携带热量,会产生温度变化.温度作为地下流体的示踪剂得到了广泛应用,但通常需要事先确定热扩散系数.实际上,基于浅层地壳不同深度的周期性温度-时间序列,利用流体运动对振幅和相位的影响,可以同步获取热扩散系数和地下流体运移信息.本文以新疆喀什地区5个钻孔不同深度的基岩温度数据为基础,获取了热扩散系数和流体运移特征.主要成果有:(1)获得了不同测点的热扩散系数α,以及视热扩散系αA和αΦ(即单独通过振幅或相位获得的热扩散系数).其中,α、αA和αΦ的值分别为1.52~8.91、0.79~1.71和(1.53~33.1)×10^(-6) m 2·s^(-1).另外,当流体热效应不明显时,通过相位获得的视热扩散系αΦ更接近真实的热扩散系数α.(2)获得了不同测点的流体流向和流速信息.测点的流体流向均向上,靠近天山地区的测点流体流速为(0.10~1.94)×10^(-7) m·s^(-1),靠近昆仑山地区的测点流体流速为(8.56~9.71)×10^(-7) m·s^(-1),不同地区测点流体流速的差异可能与区域水文地质环境有关.总之,通过多深度的连续基岩温度观测,有望获得浅层地壳的热扩散系数及流体运移特征.
