| 张渤地震带高光谱气体地球化学特征 |
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| 基金项目： | Project supported by the National Natural Science Foundation of China "Contribution of C-bearing gas emission from solid Earth before and after the great Wenchuan earthquake in Western Sichuan to the atmosphere"(No.41403099); The Basic Research Project of Institute of Earthquake Science, CEA "Characteristics of hyper-spectrum gas geochemistry along the Longmenshan Fault"(No.2015IES0402) |
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| 摘 要： | 利用卫星高光谱数据分析了张家口—渤海(张渤)地震带CO和CH4总量的时、空变化特征及其影响因素。时间上,该地区CO总量存在明显的周期性季节变化,但是CH4总量的周期性季节变化不明显。空间上,研究区南部CO和CH4总量高于北部地区;由西向东气体总量增大,在平原和山区交界的地方变化明显。CO和CH4总量背景趋势时间上受气候和气象变化影响,空间上主要受控于区域地形地貌、地质背景、构造和地震活动及地壳厚度等。研究结果不仅为研究区地震地球化学测量提供了新的科学资料,而且对地震异常判识、断裂带分段活动性研究具有重要意义。
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Gas Geochemical Characteristics of the Zhang-Bo Seismic Zone Extracted from Hyper-Spectral Data |
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| Authors: | Cui Yueju Du Jianguo Li Ying Liu Lei Zhou Xiaocheng Chen Yang Chen Zhi Han Xiaokun |
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| Institution: | 1. CEA Key Laboratory of Earthquake Prediction (Institute of Earthquake Science), China Earthquake Administration, Beijing 100036, China;
2. China Aero Geophysical Survey & Remote Sensing Center for Land and Resources, Beijing 100083, China;
3. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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| Abstract: | The affecting factors on gas geochemical characteristics extracted from hyper-spectral data in the Zhangjiakou-Bohai seismic zone were discussed. Temporal and spatial variations of total column CO and CH4 were analyzed based on the satellite hyper-spectral data. Temporally, the total column CO in the study area showed obviously seasonal variation, while CH4 didn't. Spatially, values of total column CO and CH4 in the southern part of the study area were higher than thoes in the northern part. Both total column CO and CH4 increased from western to eastern, and showed the largest changing rate over the piedmont fault zone at the junction of plain and mountains. The temporal variations of total CO and CH4 backgrounds could be attributed to the effects of climate and weather. The spatial variations of total CO and CH4 backgrounds may be controlled by the regional topography, geology, seismic activities, crustal thickness and so on. The results not only provide new scientific data for monitoring earthquake, but also have an important significance to the study of earthquake anomaly identification and segmentation seismic activity of fault zone. |
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| Keywords: | Geochemistry CH4 Satellite hyper-spectral remote sensing Seismic activity CO |
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