华南大陆东部赣闽地区地壳厚度与泊松比研究

通过收集江西省和福建省共58个固定台站记录到的2011-01～2012-12的远震数据，利用接收函数H-κ扫描叠加方法得到台站下方平均地壳厚度和波速比估计，并通过插值得到华南大陆东部赣闽地区整体的地壳厚度变化趋势以及泊松比分布情况。结果表明，研究区地壳厚度约为28～34 km，由内陆向沿海有起伏地逐渐减薄，赣南地区同福建沿海地区地壳厚度较薄，江西东部和福建西北部地壳较厚；泊松比约为0.21～0.28，由内陆向沿海逐渐增加，赣北地区泊松比值最低，低于0.23（波速比低于1.70），沿海地区泊松比较高，可达0.28（波速比为1.83）。并探讨了造成地壳厚度和泊松比变化的构造因素。

Crustal Thickness and Poisson’s Ratio in Jiangxi and Fujian Province in Eastern Areas of South China

This paper selects tele-seismic records from 58 permanentstations setting in Jiangxi and Fujian provinces,from January 2011 and December 2012.We get information on crustal thickness and average Vp/Vs ratio estimation by the H-κ stacking method. We further obtain the image of the crustal thickness and Poisson’s ratio and their variation trend by interpolation. The study shows that: crustal thickness of the study area ranges 28-34 km,characterized by gradual thinning from inland to coast in the region of SE China margin;the southern area of Jiangxi province and the coastline of Fujian province have the thinnest crust in the study area,while the eastern area of Jiangxi province and the northwesternarea of Fujian province have thicker crust.The crustal average Poisson’s ratio ranges from 0.21-0.28,increasing from land to sea; the northern area of Jiangxi province has a low Poisson’s ratio,less than 0.23, with a Vp/Vs ratio ofless than 1.70.The coastline of Fujian province has a higher ratio,up to 0.28, with a Vp/Vs ratio of about 1.83.