采集湖北地区的22个地表水水样,采用蒸发法,测量水样中总α、总β放射性水平,并依据相关标准,对测量数据进行了分析研究。研究结果表明,枯水期水样,总α、总β放射性水平分别为(0.008±0.007)^(0.058±0.009)Bq/L、(0.017±...采集湖北地区的22个地表水水样,采用蒸发法,测量水样中总α、总β放射性水平,并依据相关标准,对测量数据进行了分析研究。研究结果表明,枯水期水样,总α、总β放射性水平分别为(0.008±0.007)^(0.058±0.009)Bq/L、(0.017±0.003)^(0.312±0.024)Bq/L;丰水期水样,总α、总β放射性水平分别为(0.011±0.006)^(0.037±0.016)Bq/L、(0.103±0.027)^(0.389±0.082)Bq/L。成人饮用监测水样所致年有效剂量在0.006~0.022 m Sv/a,远低于世界卫生组织推荐值0.1 m Sv/a;工作区地区地表水在枯水期和丰水期的放射性水平均未超过国家生活饮用水卫生标准限值。所测地表水不用采取任何降低其中放射性污染物的措施就可作为饮用水水源。展开更多
Deep drilling data on seismogenic faults that are obtained directly can help in understanding earthquake mechanisms and the resulting changes in deep structure and material composition.However,geophysical data are nec...Deep drilling data on seismogenic faults that are obtained directly can help in understanding earthquake mechanisms and the resulting changes in deep structure and material composition.However,geophysical data are necessary to ensure that the planned borehole accurately drills through the target faults.In this study,the deep crustal structure of the Longmenshan fault is explored to obtain seismogenic fault characteristics of the Wenchuan earthquake.A scientific drilling project,Wenchuan Earthquake Fault Scientific Drilling No.4 Borehole(WFSD-4)is proposed with a borehole designed to drill through the north section of the fault zone while penetrating as many geological bodies and target layers related to seismogenic fault slip as possible.High-precision seismic exploration is then carried out to study the deep structure of the fault zone and achieve the scientific objective of the borehole.Two high-precision deep seismic reflection lines were arranged perpendicularly to the fault zone,and data were obtained through special acquisition schemes and processing methods.Finally,the surface position and drilling depth route of WFSD-4 are determined based on the interpretation results of seismic profiles.The seismic reflection method for site selection of the Wenchuan earthquake fault scientific drilling is proven feasible by comparing the interpretation with the actual drilling results,laying the foundation for further study on the deep structures of fault zones.展开更多
文摘采集湖北地区的22个地表水水样,采用蒸发法,测量水样中总α、总β放射性水平,并依据相关标准,对测量数据进行了分析研究。研究结果表明,枯水期水样,总α、总β放射性水平分别为(0.008±0.007)^(0.058±0.009)Bq/L、(0.017±0.003)^(0.312±0.024)Bq/L;丰水期水样,总α、总β放射性水平分别为(0.011±0.006)^(0.037±0.016)Bq/L、(0.103±0.027)^(0.389±0.082)Bq/L。成人饮用监测水样所致年有效剂量在0.006~0.022 m Sv/a,远低于世界卫生组织推荐值0.1 m Sv/a;工作区地区地表水在枯水期和丰水期的放射性水平均未超过国家生活饮用水卫生标准限值。所测地表水不用采取任何降低其中放射性污染物的措施就可作为饮用水水源。
基金supported by the“Deep Structure and Variation Characteristics of Fracture Shear Band of the Longmenshan Fault Zone”of the National Natural Science Foundation of China (No.42174123)the“Wenchuan Earthquake Fault Scientific Drilling”of the National Science and Technology Planning Project and the“3D Geological Mapping of Longmenshan Fault Zone”Project of the CGS China Geological Survey (No.1212011220265).
文摘Deep drilling data on seismogenic faults that are obtained directly can help in understanding earthquake mechanisms and the resulting changes in deep structure and material composition.However,geophysical data are necessary to ensure that the planned borehole accurately drills through the target faults.In this study,the deep crustal structure of the Longmenshan fault is explored to obtain seismogenic fault characteristics of the Wenchuan earthquake.A scientific drilling project,Wenchuan Earthquake Fault Scientific Drilling No.4 Borehole(WFSD-4)is proposed with a borehole designed to drill through the north section of the fault zone while penetrating as many geological bodies and target layers related to seismogenic fault slip as possible.High-precision seismic exploration is then carried out to study the deep structure of the fault zone and achieve the scientific objective of the borehole.Two high-precision deep seismic reflection lines were arranged perpendicularly to the fault zone,and data were obtained through special acquisition schemes and processing methods.Finally,the surface position and drilling depth route of WFSD-4 are determined based on the interpretation results of seismic profiles.The seismic reflection method for site selection of the Wenchuan earthquake fault scientific drilling is proven feasible by comparing the interpretation with the actual drilling results,laying the foundation for further study on the deep structures of fault zones.
