利用天然地震震相探讨阿尔金地区地壳结构
|
摘要
本文利用阿尔金地区的宽频地震数据,对布设在该区的10个宽频地震台站用接收函数方法进行了速度结构反演。反演的初步结果发现,若羌至花土沟剖面在20km深度处有一条厚度达5～10km的低速带断续出现,莫霍界面呈台阶状展布,北部浅,南部深;塔里木盆地南缘的地壳厚度为40～42km左右;在阿尔金南、北缘断裂两侧台站下方莫霍深度的错断约6.5～8km,在柴达木盆地北缘,莫霍面的深度达50km以上,S波速为4.5km/s。
Inversion on velocity structure was conducted applying the receiver function to the data from 10 of the broad-band teleseismic stations deployed in the Altun area. The tentative results show an intermittent low-velocity zone 5-10 km thick at a depth of around 20 km along the Ruo-qiang-Huatugou profile. The Moho is step-like, being shallow in the north and deep in the south. The crustal thickness is 40-42 km in the southern Tarim Basin. A drop of 6. 5-8 km in Moho depth is present beneath the stations on the sides of the Altun south-margin and north-margin faults, while the Moho depth beneath the northern margin of the Qaidam basin is up to over 50 km with an S wave velocity of 4. 5 km/s.
Inversion on velocity structure was conducted applying the receiver function to the data from 10 of the broad-band teleseismic stations deployed in the Altun area. The tentative results show an intermittent low-velocity zone 5-10 km thick at a depth of around 20 km along the Ruo-qiang-Huatugou profile. The Moho is step-like, being shallow in the north and deep in the south. The crustal thickness is 40-42 km in the southern Tarim Basin. A drop of 6. 5-8 km in Moho depth is present beneath the stations on the sides of the Altun south-margin and north-margin faults, while the Moho depth beneath the northern margin of the Qaidam basin is up to over 50 km with an S wave velocity of 4. 5 km/s.
引文
1 张显庭,郑健康,荀金,廖秀深,洪哲生,刘健民.阿尔金山东段槽型晚奥陶世地层的发现及其构造意义.地质论评,1984,30(2) :184～186．
2 国家地震局“阿尔金活动断裂带”课题组.阿尔金活动断裂带.北京:地震出版社,1991． 10～50．
3 《地质论评》编辑部.间尔金断裂系是陆内转换断裂系.地质论评,1994,40(3) :288．
4 孙勇,刘池阳,车自成.阿尔金山拉配泉地区元古宙裂谷火山岩系及其构造意义.地质论评,1997,43(1) :17～24．
5 张建新,许志琴,崔军文.一个韧性转换挤压带的变形分解作用--以阿尔金断裂带东段为例.地质论评,1998,44(4) :348～356．
6 郭召杰,张志诚.阿尔金盆地群构造类型与演化.地质论评,1998,44(4) :357～364．
7 周勇,潘裕生.阿尔金断裂早期走滑运动方向及其活动时间探讨.地质论评,1999,45(1) :1～9．
8 赵珠,曾融生.西藏高原地壳上地幔P波和S波速度结构.地震学报,1992,(14增刊):573～579．
9 朱露培.利用宽频带远震体波波形研究青藏高原地壳上地幔速度结构的初步结果.地震学报,1992,14(增刊):580～591．
10 Langston C A. The effect of planar dipping structure on source and receiver responses for constant ray parameter. Bull. Seis mol. Soc. Am., 1977,67:1029～1050．
11 Langston C A. Structure under Mount Rainier,Washington,inferred from teleseismic body waves. J. G. R.,1979,84:4749～4762．
12 Owens T J,Zandt G, Taylor S R. Seismic evidence for ancient rift beneath the Cumberland Plateau. Tennessee:Adetailed Analysis of Broadband Teleseismic P Weveforms. J. G. R., 1984,89(B9) :7783～7795．
13 Owens T J, Taylor S R,Zandt G. Crustal structure at regional seismic test network staions dedermined from inversion of broadband teleseismic P waveforms. Bull. Seisin. Soc. Amer., 1987,77: 631～662．
14 王泽九,吴功建,肖序常.格尔木至额济纳旗地学断面研究文集.地球物理学报,1995,38(增刊Ⅱ):1～6．
15 姜枚,吕庆田,薛光琦.中法两国联合进行青藏高原天然地震探测地壳结构的研究.地球物理学报,1994,37(3) :412～413．
16 姜枚,吕庆田,史大年,薛光琦,Poupinet G,Hirn A.用天然地震探测青藏高原中部地壳、上地幔结构.地球物理学报,1996,39(4) :470～481．
① 崔军文.阿尔金断裂系.1996．
① 史大年.阿尔金断裂带地壳和上地幔结构的P波层析成像.1996． 6～8．
2 国家地震局“阿尔金活动断裂带”课题组.阿尔金活动断裂带.北京:地震出版社,1991． 10～50．
3 《地质论评》编辑部.间尔金断裂系是陆内转换断裂系.地质论评,1994,40(3) :288．
4 孙勇,刘池阳,车自成.阿尔金山拉配泉地区元古宙裂谷火山岩系及其构造意义.地质论评,1997,43(1) :17～24．
5 张建新,许志琴,崔军文.一个韧性转换挤压带的变形分解作用--以阿尔金断裂带东段为例.地质论评,1998,44(4) :348～356．
6 郭召杰,张志诚.阿尔金盆地群构造类型与演化.地质论评,1998,44(4) :357～364．
7 周勇,潘裕生.阿尔金断裂早期走滑运动方向及其活动时间探讨.地质论评,1999,45(1) :1～9．
8 赵珠,曾融生.西藏高原地壳上地幔P波和S波速度结构.地震学报,1992,(14增刊):573～579．
9 朱露培.利用宽频带远震体波波形研究青藏高原地壳上地幔速度结构的初步结果.地震学报,1992,14(增刊):580～591．
10 Langston C A. The effect of planar dipping structure on source and receiver responses for constant ray parameter. Bull. Seis mol. Soc. Am., 1977,67:1029～1050．
11 Langston C A. Structure under Mount Rainier,Washington,inferred from teleseismic body waves. J. G. R.,1979,84:4749～4762．
12 Owens T J,Zandt G, Taylor S R. Seismic evidence for ancient rift beneath the Cumberland Plateau. Tennessee:Adetailed Analysis of Broadband Teleseismic P Weveforms. J. G. R., 1984,89(B9) :7783～7795．
13 Owens T J, Taylor S R,Zandt G. Crustal structure at regional seismic test network staions dedermined from inversion of broadband teleseismic P waveforms. Bull. Seisin. Soc. Amer., 1987,77: 631～662．
14 王泽九,吴功建,肖序常.格尔木至额济纳旗地学断面研究文集.地球物理学报,1995,38(增刊Ⅱ):1～6．
15 姜枚,吕庆田,薛光琦.中法两国联合进行青藏高原天然地震探测地壳结构的研究.地球物理学报,1994,37(3) :412～413．
16 姜枚,吕庆田,史大年,薛光琦,Poupinet G,Hirn A.用天然地震探测青藏高原中部地壳、上地幔结构.地球物理学报,1996,39(4) :470～481．
① 崔军文.阿尔金断裂系.1996．
① 史大年.阿尔金断裂带地壳和上地幔结构的P波层析成像.1996． 6～8．
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心