摘要
通过对胶州湾进行大比例尺磁力测量,绘制了胶州湾磁力异常图。胶州湾磁异常呈以下特征:在胶州湾中北部为变化较平缓的正磁异常区,梯度变化较小。西部则是NW向条带状强磁变化异常区,磁异常正负变化剧烈,呈明显的条带状展布。胶州湾东北角磁异常则表现为团块状分布,并以正异常为主。南部表现为混合异常,上部(大致为胶州湾最中间地带)磁异常为近东西向条带状展布,而胶州湾南部基本呈NE向正负相间分布。上述磁异常现象表明,胶州湾的断裂构造比较发育,在NE向断裂构造大背景下,从磁异常分布图上可以清楚地判别出NW向及近东西向断裂分布,这些断裂对胶州湾的工程建设将产生不利的影响。
Based on the magnetic survey data in the Jiaozhou Bay, the magnetic anomaly map was plotted. It is shown from the map that the central and northern Jiaozhou Bay is a positive magnetic anomaly area with gentle variations in magnetic anomaly and gradient; the western bay is a strong banded variant magnetic anomaly area with a banded distributions of alternate postive and negative magnetic anomalies; the magnetic anomaly in the northeastern Jiaozhou Bay shows a patchy distribution and is mainly positive anomaly; and the southern survey area is a mixed magnetic anomaly area with the magnetic anomaly in the middle Jiaozhou Bay showing near east-westly trending banded distributions and that in the southern Jiaozhou Bay showing NE trending alternate positive and negative anomaly distribution. It is shown from above-mentioned magnetic anomaly phenomena that the fault structures is the Jaozhou Bay are well developed, the NW and near east-westly trending faults against the NE trending fault structure background can be identified in the magnetic anomaly distribution map, and these faults can bring about unfavorable effects on the engineering construction in the Jiaozhou Bay.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2004年第3期306-312,共7页
Advances in Marine Science
基金
国家高技术发展研究计划项目--数字海底技术渤海油田示范区的建设(2003AA602190)资助项目
关键词
胶州湾
磁异常
工程地质
断裂
Jiaozhou Bay
magnetic anomaly
engineering geology
fault
