摘要
利用NGDC-720-V3模型,计算了陕西地区地壳磁异常不同分量网点值,通过计算数据分析了该地区地壳磁异常基本形态及分区特征,结果表明:(1)陕西地壳磁异常各分量强度较弱,分布形态以宽缓的条带为主。(2)陕西北部三条正负相间的磁异常条带可能与基底大断裂有关,反映了块体内部早期不同基底的拼合。(3)陕西南部地壳磁异常总体表现为近东西向大面积的负异常,东部和西部负异常强度有所不同,可能与地壳内物性差异有关。
Using NGDC- 720- V3 model, we calculated the crustal magnetic anomaly of different component in Shaanxi Province,and analyzed the basic pattern and sub-division characteristics of crustal magnetic anomalies in the study area through data calculation. The analysis result show s that：（ 1） The strength of crustal magnetic anomalies of each component was weak in Shaanxi,and the distribution pattern of it appeared broad strips with a small gradient.（ 2） Three magnetic anomaly belt with positive and negative may be associated with basement faults in northern Shaanxi,which reflected the spliced of the different base blocks in internal block in the early period.（ 3） In southern Shaanxi,the overall pattern of crustal magnetic anomalies showed the negative anomaly in east-w est trend in large areas,the intensity of negative anomaly was different betw een the east and west of Shaanxi,which may be associated with the physical differences in the crust.
出处
《地震研究》
CSCD
北大核心
2015年第3期396-400,517,共5页
Journal of Seismological Research
基金
陕西省地震局启航与创新基金(201311)资助
关键词
地磁模型
地壳磁异常
陕西地区
magnetic model
crustal magnetic anomaly
Shaanxi area
