| 摘要: |
| 利用浅地层剖面资料研究了天津近海海域存在的主要海底地质灾害。研究发现浅层气、埋藏三角洲前缘、水下潮流沙脊、陡坎、沙波等地质灾害发育。浅层气主要分布在研究区北部海域的近岸附近，南部海域远离海岸浅层气逐渐增多；埋藏三角洲前缘分布区北至涧河口，南至南港工业区东部海域；水下沙脊分布于北部海域5-7 m水深的近岸带，地层内部前积斜层理发育；沙波区延伸长度约3 km，整体上在天津海域分布较少；海底表层陡坎出现在天津港及以南海域，其成因主要是航道两侧边缘陡坎或因吹填而抽走的泥沙造成的，近岸及远海地区均有分布。 |
| 关键词: 天津近海海域 地质灾害类型 浅层气 陡坎 埋藏三角洲前缘 水下沙脊 |
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| The acoustic characteristics and the type of submarine geological hazards in Tianjin offshore area |
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zhaowei1, xiongyuankai2, gongshaojun1, zhanhuaming1, qiaojiguo1
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1.Tianjin Exploration Center of Marine Geology;2.Hainan Marine Geological Survey academy
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| Abstract: |
| Based on the shallow seismic profile data, the seafloor geological hazards of tianjin offshore areas which include the shallow gas, the scarp, the burial of delta front, Submarine sand ridges and sand wave were discussed. The submarine shallow gas is widely distributed in the inshore waters of northern area and the far-shore waters of southern area；The burial of delta front distribute range north to the Jian River，south to the eastern sea area of the Nangang Industrial Zone；Submarine sand ridges distribute near-shore waters of northern area whose depth range from 5m to 7m, Foreset inclined bedding exists in the formation of internal. Sand wave extended about 3km,and rarely distributed；the scarp distribute the eastern and southern sea area of the Tianjin port，which exists because of channel excavation and land formation, distribute range from nearshore to farshore. |
| Key words: Tianjin offshore areas the type of geological hazards the shallow gas the scarp The burial of delta front Submarine sand ridges |