针对具有潜在喷发危险的长白山火山岩浆系统相关的低速低阻体在岩石圈中展布认识不一的问题，本申请将汇集长白山火山区周边的地震观测资料，包括密集的短周期地震台和朝鲜半岛的地震观测资料，采用先进的地震学方法提取多种约束信息进行精细的岩石圈结构反演。即采用考虑倾斜界面和各向异性影响的接收函数H-k叠加方法获取地壳厚度和Vp/Vs波速比分布，结合接收函数的三维偏移成像反演来有效约束主要间断面特征，利用接收函数Ps转换波来获取地壳各向异性信息；结合地震面波的双台分析和背景噪声的波形相关分析来提取面波的基阶与高阶频散曲线，采用面波直接成像方法来提高火山正下方结构反演的分辨率，通过面波和接收函数的联合反演获取岩石圈的精细速度结构；融合SKS分析和接收函数及面波反演获取的地壳和上地幔各向异性信息，以及地球化学和岩石学及火山学的研究结果，探讨太平洋俯冲对长白山火山的动力作用，增进对长白山火山岩浆系统的认识。

There is a growing concern about the potential eruption of the Changbaishan volcano in recent years worldwide. However, the detailed magmatic system beneath this volcano still remains hotly debated. To investigate the detailed magmatic system beneath the Changbaishan volcanic field (CHVF), this project will combine available data from the dense seismic arrays and permanent network around the CHVF, including 31 short-period seismometers around the Tianchi volcanic area and seismic stations from North Korea and South Korea, to construct a high-resolution 3-D lithospheric S-wave velocity model beneath the CHVF. We will estimate crustal thickness and the bulk crustal ratio of P-wave velocity to S-wave velocity (Vp/Vs) using the improved H-κ method by harmonic analysis on Ps and crustal multiples in receiver functions with respect to dipping layers and crustal anisotropy. And we will use receiver function method with common-conversion-point stacking technique to image the complex structure beneath the CHVF. Then we will measure dispersion curves across the CHVF for the fundamental mode and higher modes. The combined use of higher modes offers additional constraint for the velocity structure, which leads to better results of joint inversion using surface wave dispersion curves and receiver functions. We will further integrate all observational constraints on seismic anisotropy from the splitting of shear waves, the character of P-to-S conversions, and the surface wave. These will help us to isolate anisotropy in different parts of crustal and mantle should result in tighter constraints on anisotropic geometry. Then we are able to directly relate seismic velocity anomalies of lithosphere to melt fractions and distributions of the CHVF magmatic system by integrating petrological, geochemical and other geophysical data. And it will further improve our understanding of the involvement of subducted Pacific slab for the magma evolution of the CHVF.