西北太平洋俯冲带东北地区壳幔结构研究进展

总结了近年来西北太平洋俯冲前端东北地区地壳的精细结构和上地幔间断面410和660km的研究成果.认为：该区莫霍面深约为30～39km.410km的间断面有30km的深度异常，这种异常是否在过渡带正常或含水相变展布厚度的内，还是于该区俯冲带的后退有关，还需做进一步的研究论证.在中国东北地区，日本海俯冲带向西倾斜，在660km的间断面上近似水平停滞汇集被大多数层析成像、接收函数、波形拟和以及深震研究所认同.然而，俯冲带具体的形式、大小范围，向下渗透到多深以及在局部地区表现的横向不连续性的看法并不一致.由此带来的动力学模式什么力来支撑着停滞的板片，在板片最终下沉到下地幔以前，有多少俯冲的板片能停滞在间断面之上，这些问题都还需要更合理的解释.

A review of latest crustal and upper mantle discontinuities studies beneath northeast China in northwest Pacific subduction zone

In this paper we reviewed recent seismic studies of the moho,410 and 660km discontinuities in the Japan subduction zone beneath northeast China.It is generally accepted that the moho depth is about 30~39km in this region.A deeper~than~normal 410km discontinuity is observed by receiver functions,and there are question whether this abnormity caused by regression of subdection slab or water within in the transition zone in the depth range between 410 and 660km.It is favorable that the Japan subduction is deflected and accumulating above the 660km discontinuity by studies of tomography,receiver function and waveform modeling and the deflected slabs are not laterally continuous but separated into a few subregions.If so,there are outstanding questions as to what controls the slab behavior for stagnation,how much of the subducted slab can stagnate in the transition zone before it eventually sinks.