Because of the significance to the formation and evolution of the Tibetan plateau, the displacement and slip rate of the Altyn Tagh fault have been topics full of disputation. Scientists who hold different opinions on...Because of the significance to the formation and evolution of the Tibetan plateau, the displacement and slip rate of the Altyn Tagh fault have been topics full of disputation. Scientists who hold different opinions on the evolution of Tibet insist on different slip rates and displacements of the fault zone. In the article, study is focused on the late Quaternary slip rate of the Altyn Tagh fault west of the Cherchen River (between 85°E and 85°45’E). On the basis of high resolution SPOT images of the region, three sites, namely Koramlik, Aqqan pasture and Dalakuansay, were chosen for field investigation. To calculate the slip rate of the fault, displacement of terraces was measured on SPOT satellite images or in situ during fieldwork and thermo-luminescence (TL) dating method was used. To get the ages of terraces, samples of sand were collected from the uppermost sand beds that lie just under loess. The method for calculating slip rate of fault is to divide the displacement of terrace risers by the age of its neighboring lower terrace. The displacement of rivers is not considered in this article because of its uncertainties. At Koramlik, the slip rate of the Altyn Tagh fault is 11.6±2.6mm/a since 6.02±0.47ka B.P and 9.6±2.6mm/a since 15.76±1.19ka B.P. At Aqqan pasture, about 30km west of Koramlik, the slip rate is 12.1±1.9mm/a since 2.06±0.16 ka B.P. At Dalakuansayi, the slip rate of the fault is 12.2±3.0mm/a since 4.91±0.39ka B.P. Hence, we get the average slip rate of 11.4±2.5mm/a for the western part of the Altyn Tagh Fault since Holocene. This result is close to the latest results from GPS research.展开更多
The spatial mismatch situation of tourism development in Guangdong Province is analyzed by gravity model and two-dimensional matrix based on the spatial mismatch hypothesis,and the results are visualized using Arc GIS...The spatial mismatch situation of tourism development in Guangdong Province is analyzed by gravity model and two-dimensional matrix based on the spatial mismatch hypothesis,and the results are visualized using Arc GIS software.This study finds that varying degrees of spatial mismatch exist between the level of tourism development,abundance of tourism resources and accessibility of tourism locations in the 21 cities in Guangdong Province.The gravity centers for tourism economy,tourism resources and tourism location are（113.55°E,23.00°N）,（113.69°E,23.21°N）and（113.74°E,22.86°N）,respectively.According to the two-dimensional combinatorial matrices,synchronous development is shown in 10 prefecture-level cities for the tourism revenue-resource abundance combination,whereas it is shown in seven prefecture-level cities for the tourism revenue-tourism location combination.Guangzhou and Shenzhen are synchronous-double high zones for both combinations,while Foshan,Qingyuan,Yangjiang,Zhongshan and Jieyang are deviating-negative mismatch zones for both combinations.Furthermore,the vast majority of prefecture-level cities within the province currently present mismatching trends in tourism development.Based on the analysis results,corresponding countermeasures and suggestions are put forward taking into account the actual situation and opportunities for further tourism development in various prefecture-level cities.展开更多
文摘Because of the significance to the formation and evolution of the Tibetan plateau, the displacement and slip rate of the Altyn Tagh fault have been topics full of disputation. Scientists who hold different opinions on the evolution of Tibet insist on different slip rates and displacements of the fault zone. In the article, study is focused on the late Quaternary slip rate of the Altyn Tagh fault west of the Cherchen River (between 85°E and 85°45’E). On the basis of high resolution SPOT images of the region, three sites, namely Koramlik, Aqqan pasture and Dalakuansay, were chosen for field investigation. To calculate the slip rate of the fault, displacement of terraces was measured on SPOT satellite images or in situ during fieldwork and thermo-luminescence (TL) dating method was used. To get the ages of terraces, samples of sand were collected from the uppermost sand beds that lie just under loess. The method for calculating slip rate of fault is to divide the displacement of terrace risers by the age of its neighboring lower terrace. The displacement of rivers is not considered in this article because of its uncertainties. At Koramlik, the slip rate of the Altyn Tagh fault is 11.6±2.6mm/a since 6.02±0.47ka B.P and 9.6±2.6mm/a since 15.76±1.19ka B.P. At Aqqan pasture, about 30km west of Koramlik, the slip rate is 12.1±1.9mm/a since 2.06±0.16 ka B.P. At Dalakuansayi, the slip rate of the fault is 12.2±3.0mm/a since 4.91±0.39ka B.P. Hence, we get the average slip rate of 11.4±2.5mm/a for the western part of the Altyn Tagh Fault since Holocene. This result is close to the latest results from GPS research.
基金The Major Program of National Social Science Foundation of China(17ZDA165)
文摘The spatial mismatch situation of tourism development in Guangdong Province is analyzed by gravity model and two-dimensional matrix based on the spatial mismatch hypothesis,and the results are visualized using Arc GIS software.This study finds that varying degrees of spatial mismatch exist between the level of tourism development,abundance of tourism resources and accessibility of tourism locations in the 21 cities in Guangdong Province.The gravity centers for tourism economy,tourism resources and tourism location are（113.55°E,23.00°N）,（113.69°E,23.21°N）and（113.74°E,22.86°N）,respectively.According to the two-dimensional combinatorial matrices,synchronous development is shown in 10 prefecture-level cities for the tourism revenue-resource abundance combination,whereas it is shown in seven prefecture-level cities for the tourism revenue-tourism location combination.Guangzhou and Shenzhen are synchronous-double high zones for both combinations,while Foshan,Qingyuan,Yangjiang,Zhongshan and Jieyang are deviating-negative mismatch zones for both combinations.Furthermore,the vast majority of prefecture-level cities within the province currently present mismatching trends in tourism development.Based on the analysis results,corresponding countermeasures and suggestions are put forward taking into account the actual situation and opportunities for further tourism development in various prefecture-level cities.
