防灾减灾工程学报2024，Vol.44Issue(6)：1465-1473,9.DOI:10.13409/j.cnki.jdpme.20240115002
基于接收函数的郯庐断裂带南段及其周缘壳内结构研究
Crustal Structure of the Southern Section and Surroundings of the Tan-Lu Fault Zone Based on Receiver Functions
摘要
Abstract
Extracting the teleseismic waveform data recorded from 2015 to 2022 by 40 broadband seis-mic stations on the east and west sides of the Tan-Lu fault zone in the Jiangsu-Anhui regions,1758 high-quality receiver functions were calculated and filtered using the teleseismic P-wave receiver func-tion method.The H-K superposition search method was then applied to obtain the crustal thickness and Poisson's ratio beneath each station.The results showed that:(1)The Moho interface in the study area showed significant undulations,with crustal thickness ranging from 28 to 36 km and an average crustal thickness of approximately 32.6 km.The crustal thickness was characterized with distinct block distribution,with the Moho interface burial depth in the Dabie and Sulu orogenic belts located in mountainous uplifts significantly greater than in basins or plains.Within the same block,notable varia-tions also occurred due to the complexity of topography and crustal composition.The crustal thickness showed a general thinning trend from west to east,demarcated by the Tan-Lu fault zone.There was a symmetrical relationship between the crustal thickness and the topography in the study area,with the Qinling-Dabie orogenic belt being the region of maximum crustal thickness.(2)The Poisson's ratio in the study area mainly ranged from 0.20 to 0.29,with a large span,indicating complex crustal composi-tion.The average Poisson's ratio in the study area was about 0.24,close to China's continental aver-age.Some stations located in mountainous uplift areas had higher Poisson's ratios,possibly due to the influx of molten material or the intrusion of iron and magnesium materials.Poisson's ratio in the study area showed an inverse correlation with crustal thickness,with higher crustal thickness often corre-sponding to regions with lower Poisson's ratio.关键词
苏皖地区/郯庐断裂带/接收函数/地壳厚度/泊松比Key words
Jiangsu-Anhui region/Tan-Lu fault zone/receiver function/crustal thickness/Poisson's ratio分类
天文与地球科学引用本文复制引用
李婷婷,张岑,范文华,孙小航,朱峰,孙业君..基于接收函数的郯庐断裂带南段及其周缘壳内结构研究[J].防灾减灾工程学报,2024,44(6):1465-1473,9.基金项目
三结合提升性课题(3JH-201902017)、三结合一般性课题(3JH-202401028)、江苏省地震局测震创新团队(202201)资助 （3JH-201902017）
