| 基于接收函数的华南及邻区地壳结构研究 |
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| 引用本文： | 查小惠,吕坚,江春亮,汤兰荣,董非非,鲍志诚,童琼.基于接收函数的华南及邻区地壳结构研究[J].大地测量与地球动力学,2021,41(1):67-73. |
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| 作者姓名： | 查小惠 吕坚 江春亮 汤兰荣 董非非 鲍志诚 童琼 |
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| 作者单位： | 江西省地震局,南昌市昌东大道6929号,330096;江西省地震局,南昌市昌东大道6929号,330096;江西省地震局,南昌市昌东大道6929号,330096;江西省地震局,南昌市昌东大道6929号,330096;江西省地震局,南昌市昌东大道6929号,330096;江西省地震局,南昌市昌东大道6929号,330096;湖南省地震局,长沙市中意一路326号,410004 |
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| 基金项目： | 中国地震局地震星火计划 |
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| 摘 要： | 利用华南地块及邻区2007~2012年609个地震台站记录的约900个5.7级以上远震事件，获得各台站的接收函数，通过分析接收函数的形态变化了解各台站下方的地壳结构特征，然后再利用H-κ叠加搜索技术获得各台站下方的地壳厚度和波速比。结果显示，研究区的地壳结构表现为从沿海向内陆逐渐复杂的变化，地壳厚度也表现出由沿海向内陆、自南向北逐渐增厚的趋势；研究区内的广东、福建、浙江、上海、江西、广西、安徽南部、湖北中东部、湖南中东部和云南东南部地区主要表现为标准型接收函数，地壳相对稳定，地壳厚度一般在35 km以下；研究区内的湖北西部、湖南西部、贵州、云南东部及中北部地区主要表现为过渡型接收函数，对应地壳增厚变形的区域，该区地壳厚度从约35 km逐渐增厚到约45 km；研究区内的重庆、四川、陕西南部、甘肃南部和云南北部主要表现为复杂型接收函数，对应地壳剧烈增厚的区域，地壳厚度从45 km增厚到60~70 km。
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| 关 键 词： | 接收函数 地壳厚度 华南块体 H-&kappa 叠加扫描 |
Study on Crustal Structure in South China and Adjacent Areas Based on Receiver Function |
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| ZHA Xiaohui,Lü Jian,JIANG Chunliang,TANG Lanrong,DONG Feifei,BAO Zhicheng,TONG Qiong.Study on Crustal Structure in South China and Adjacent Areas Based on Receiver Function[J].Journal of Geodesy and Geodynamics,2021,41(1):67-73. |
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| Authors: | ZHA Xiaohui LÜ Jian JIANG Chunliang TANG Lanrong DONG Feifei BAO Zhicheng TONG Qiong |
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| Institution: | (Jiangxi Earthquake Agency,6929 Changdong Road,Nanchang 330039,China;Hunan Earthquake Agency,326 First-Zhongyi Road,Changsha 410004,China) |
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| Abstract: | We obtain the Receiver functions of 609 broadband seismic stations in south China block and adjacent areas from about 900 teleseismic events(M>5.7) during 2007 to 2012. By analyzing the waveform changes of the receiver functions, we can understand the crustal structure characteristics under each station. Using the H-κ stacking and searching method, we obtain the crustal thickness and velocity ratio beneath the stations. Results show that the crustal structure of the study area presents a gradual and complex change from coastal to inland and the crustal thickness also presents a gradual increase trend from coastal to inland and from south to north. Guangdong, Fujian, Zhejiang, Shanghai, Jiangxi, Guangxi, southern Anhui, central and eastern Hubei, central and eastern Hunan and southeastern Yunnan in the study area are mainly represented by standard receiver functions. The crust is relatively stable, and the thickness of the crust is generally below 35 km, which is close to the Earth average model. The western Hubei, the western Hunan, Guizhou and the eastern, central and northern part of Yunnan mainly show transitional receiver functions. The thickness of the crust in this area increases gradually from about 35 km to about 45 km, corresponding to the area of crustal thickening and deformation. Chongqing, Sichuan, southern Shaanxi, southern Gansu and northern Yunnan in the studied area mainly show complex receiver functions. The crustal thickness increases from 45 to 60 km, or even 70 km, corresponding to the region with intense crustal thickening. |
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| Keywords: | receiver function crustal thickness south China block H-&kappa stacking method |
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