The Western Yunnan Earthquake Predication Test Site set up jointly by the China Earthquake Administration,the National Science Foundation Commission of America,and United States Geological Survey has played an importa...The Western Yunnan Earthquake Predication Test Site set up jointly by the China Earthquake Administration,the National Science Foundation Commission of America,and United States Geological Survey has played an important role in development of early earthquake research work in China. Due to various objective reasons, most of the predicted targets in the earthquake prediction test site have not been achieved,and the development has been hindered. In recent years, the experiment site has been reconsidered,and renamed the "Earthquake Science Experimental Site". Combined with the current development of seismology and the practical needs of disaster prevention and mitigation,we propose adding the "Underground Cloud Map"as the new direction of the experimental site. Using highly repeatable, environmentally friendly and safe airgun sources,we could send constant seismic signals,which realizes continuous monitoring of subsurface velocity changes. Utilizing the high-resolution 3-D crustal structure from ambient noise tomography,we could obtain 4-D (3-D space+1-D time) images of subsurface structures, which we termed the "Underground Cloud Map". The"Underground Cloud Map" can reflect underground velocity and stress changes,providing new means for the earthquake monitoring forecast nationwide,which promotes the conversion of experience-based earthquake prediction to physics-based prediction.展开更多
FY-4A卫星闪电资料与地基ADTD(Advanced Direction and Time of arrival Detecting system)闪电资料对于研究暴雨等强对流天气具有一定的指示意义,通过对四川省冕宁暴雨个例的研究,对比分析了这两种闪电资料的差别,设计了将两种闪电资...FY-4A卫星闪电资料与地基ADTD(Advanced Direction and Time of arrival Detecting system)闪电资料对于研究暴雨等强对流天气具有一定的指示意义,通过对四川省冕宁暴雨个例的研究,对比分析了这两种闪电资料的差别,设计了将两种闪电资料引入数值预报模式的多组数值试验。结果表明:(1)两种闪电资料在不同地区有不同的探测效果,ADTD闪电资料范围更广且分散,FY-4A卫星监测到的闪电数量更密集、分布更集中;两种闪电资料在进入模式之后所转化成的代理雷达回波具有很好的一致性;对于低频次的闪电来说,ADTD闪电定位仪可能比FY-4A闪电成像仪探测效率更高。(2)引入任何一种闪电资料都对降水预报具有正效果,其中ADTD闪电资料的应用对于短时降水预报准确率的提高更为有效。(3)两种闪电资料对于云微物理量的调整作用,在不同的区域有不同效果,说明这两种闪电资料的分布不完全一致,揭示出这两种闪电资料具有一定的互补性。展开更多
基金sponsored by the National Natural Science Foundation of China(Grant Nos.41790463 and 41674058)
文摘The Western Yunnan Earthquake Predication Test Site set up jointly by the China Earthquake Administration,the National Science Foundation Commission of America,and United States Geological Survey has played an important role in development of early earthquake research work in China. Due to various objective reasons, most of the predicted targets in the earthquake prediction test site have not been achieved,and the development has been hindered. In recent years, the experiment site has been reconsidered,and renamed the "Earthquake Science Experimental Site". Combined with the current development of seismology and the practical needs of disaster prevention and mitigation,we propose adding the "Underground Cloud Map"as the new direction of the experimental site. Using highly repeatable, environmentally friendly and safe airgun sources,we could send constant seismic signals,which realizes continuous monitoring of subsurface velocity changes. Utilizing the high-resolution 3-D crustal structure from ambient noise tomography,we could obtain 4-D (3-D space+1-D time) images of subsurface structures, which we termed the "Underground Cloud Map". The"Underground Cloud Map" can reflect underground velocity and stress changes,providing new means for the earthquake monitoring forecast nationwide,which promotes the conversion of experience-based earthquake prediction to physics-based prediction.
文摘FY-4A卫星闪电资料与地基ADTD(Advanced Direction and Time of arrival Detecting system)闪电资料对于研究暴雨等强对流天气具有一定的指示意义,通过对四川省冕宁暴雨个例的研究,对比分析了这两种闪电资料的差别,设计了将两种闪电资料引入数值预报模式的多组数值试验。结果表明:(1)两种闪电资料在不同地区有不同的探测效果,ADTD闪电资料范围更广且分散,FY-4A卫星监测到的闪电数量更密集、分布更集中;两种闪电资料在进入模式之后所转化成的代理雷达回波具有很好的一致性;对于低频次的闪电来说,ADTD闪电定位仪可能比FY-4A闪电成像仪探测效率更高。(2)引入任何一种闪电资料都对降水预报具有正效果,其中ADTD闪电资料的应用对于短时降水预报准确率的提高更为有效。(3)两种闪电资料对于云微物理量的调整作用,在不同的区域有不同效果,说明这两种闪电资料的分布不完全一致,揭示出这两种闪电资料具有一定的互补性。
