海底地震仪(OBS)被动源接收函数的意义和方法

The Significance and Methods of OBS Receiver Function

大洋中脊和边缘海扩张脊岩石圈结构或更深的地幔间断面由于深度大且存在部分熔融现象,人工源地震方法难以获取来自这种深度的地震信号,洋盆/海盆中又没有地震台,而利用天然地震面波精度比较低。为此,在海底地震仪(OBS)天然地震观测进行分析的基础上,提出了用OBS被动源接收函数研究洋中脊/扩张脊岩石圈深部结构和地幔过渡带(MTZ)的建议,并对OBS被动源接收函数有关问题、方法和技术路线进行了梳理描述。最后简要介绍了拟定的西南印度洋超慢速扩张脊周边开展OBS被动源观测的计划。

For the deep depth and partial melting phenomenon of lithosphere structure or deeper mantle discontinuity of mid-ocean ridge and marginal sea spreading ridge, it＇s difficult to obtain seismic signal with active source seismic method. Meanwhile, there are no permanent seismic stations in the sea basin, and there is a low precision when using the natural seismic surface wave to study. This paper puts forward the suggestion that study lithosphere structure and Mantle Transition Zone （MTZ）of mid-ocean ridge or spreading ridge with the Ocean Bottom Seismometer（OBS）passive source receive function, which is based on the analysis of OBS natural earthquake observation. The relevant issues, methods and technology route about the OBS passive source receiver function are well described. Finally, the paper introduces an experiment plan of OBS passive source observation at ultra-slow spreading Southwest Indian Ridge.