南美板块的运动和活动形变

金双根; 朱文耀

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南美板块的运动和活动形变

金双根, 朱文耀

文章导航 > 武汉大学学报 ( 信息科学版) > 2002 > 27(4): 358-362

金双根, 朱文耀. 南美板块的运动和活动形变[J]. 武汉大学学报 ( 信息科学版), 2002, 27(4): 358-362.

引用本文:

金双根, 朱文耀. 南美板块的运动和活动形变[J]. 武汉大学学报 ( 信息科学版), 2002, 27(4): 358-362.

JIN Shuanggen, ZHU Wenyao. Motion and Active Deformation of South America Plate[J]. Geomatics and Information Science of Wuhan University, 2002, 27(4): 358-362.

Citation:

JIN Shuanggen, ZHU Wenyao. Motion and Active Deformation of South America Plate[J]. Geomatics and Information Science of Wuhan University, 2002, 27(4): 358-362.

南美板块的运动和活动形变

中国科学院上海天文台, 上海市南丹路80号, 200030

基金项目: 国家攀登计划资助项目(970231003);国家"973"计划资助项目(G1998040703);中科院重要基础研究资助项目(KJ951-1-304);上海科技基础发展基金资助项目(JC14012)

详细信息

作者简介:
金双根,博士生。现主要从事板块运动、GPS气象学研究。E-mail:sgjin@263.net

中图分类号: P228.42;P542

Motion and Active Deformation of South America Plate

Shanghai Astronomy Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, China, 200030

摘要: 利用GPS测量南美板块地表位移来研究南美板块的运动和形变以及在智利海沟处纳兹卡-南美边界形变。南美板块以平均14.0mm/a的速度整体向北移动,在东西向以10.9mm/a的速度收缩,并存在3.8mm/a整体性向东偏移,因此大西洋在扩张的同时有一个微小的向东移动,形成现今大西洋中脊向东扭曲的形态。并基于空间大地测量资料,确立独立于任何板块运动模型约束和假设的南美板块欧拉参数,分析了现今南美板块的运动和活动形变。
- 南美板块 /
- 板块运动 /
- 活动形变 /
- 欧拉参数
Abstract: The South America plate lies among the Caribbean Sea,Peru-Chile sea gouge,Nazca,COCO plate and Atlantic,which subjects to the eastward violent push of Nazca and extrusion of seafloor spreading at mid-Atlantic ridge,especially the second highest mountain Andes,where the tectonic plate activities,such as earthquakes,volcanic eruption,mountain building and other events,take place frequently,so the inter-plate deformation and plate motion are very complicated.Now it provides a guarantee for studying plate motion at an mm/a level with the rapid development of the space geodetic techniques,such as very long baseline interferometry(VLBI),satellite laser range(SLR),global positioning system(GPS) and doppler orbit determination and Radio positioning Integrated by satellite(DORIS) in twenty years.In this paper,by analyzing the plate motion,active deformation of the South America plate,and relative deformation of the Nazca-South America plate through space geodetic measurements,the South America plate is moving northward at average 14.0mm/a,shrinking west eastward at 10.9 mm/a and wholly moving eastward at 3.8 mm/a,so the mid-Atlantic ridge is moving eastward slightly while spreading,which is perhaps the reason that causes mid-Atlantic ridge at about 0~10°S to distort eastward.And this paper further analyzes the present-day plate motion and active deformation of the South America plate based on the Euler vector of the South America plate determined from an about 20-year time span of space geodetic data,incorporating the space geodetic velocity field that was free of any additional tectonic plate model assumption,so the Euler vector of the South America plate derived from space geodetic data can better describe contemporary features of the South America plate motion than the geological model NNR-NUVEL1A that was determined based on the geological and geophysical data in several million years.But the differences of deformation in the South America plate based on these two models are very significant for contemporary crustal deformation measurement in mm/a accuracy,which shows present-day motion characteristic of the South America plate.
- South America plate /
- plate motion /
- active deformation /
- Euler parameter

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南美板块的运动和活动形变

中国科学院上海天文台, 上海市南丹路80号, 200030

作者简介:
金双根,博士生。现主要从事板块运动、GPS气象学研究。E-mail:sgjin@263.net

收稿日期: 2002-04-16
刊出日期: 2002-04-05

中图分类号: P228.42;P542

关键词:

摘要: 利用GPS测量南美板块地表位移来研究南美板块的运动和形变以及在智利海沟处纳兹卡-南美边界形变。南美板块以平均14.0mm/a的速度整体向北移动,在东西向以10.9mm/a的速度收缩,并存在3.8mm/a整体性向东偏移,因此大西洋在扩张的同时有一个微小的向东移动,形成现今大西洋中脊向东扭曲的形态。并基于空间大地测量资料,确立独立于任何板块运动模型约束和假设的南美板块欧拉参数,分析了现今南美板块的运动和活动形变。

English Abstract

Motion and Active Deformation of South America Plate

Shanghai Astronomy Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, China, 200030

Received Date: 2002-04-16
Publish Date: 2002-04-05

Keywords:

Abstract: The South America plate lies among the Caribbean Sea,Peru-Chile sea gouge,Nazca,COCO plate and Atlantic,which subjects to the eastward violent push of Nazca and extrusion of seafloor spreading at mid-Atlantic ridge,especially the second highest mountain Andes,where the tectonic plate activities,such as earthquakes,volcanic eruption,mountain building and other events,take place frequently,so the inter-plate deformation and plate motion are very complicated.Now it provides a guarantee for studying plate motion at an mm/a level with the rapid development of the space geodetic techniques,such as very long baseline interferometry(VLBI),satellite laser range(SLR),global positioning system(GPS) and doppler orbit determination and Radio positioning Integrated by satellite(DORIS) in twenty years.In this paper,by analyzing the plate motion,active deformation of the South America plate,and relative deformation of the Nazca-South America plate through space geodetic measurements,the South America plate is moving northward at average 14.0mm/a,shrinking west eastward at 10.9 mm/a and wholly moving eastward at 3.8 mm/a,so the mid-Atlantic ridge is moving eastward slightly while spreading,which is perhaps the reason that causes mid-Atlantic ridge at about 0~10°S to distort eastward.And this paper further analyzes the present-day plate motion and active deformation of the South America plate based on the Euler vector of the South America plate determined from an about 20-year time span of space geodetic data,incorporating the space geodetic velocity field that was free of any additional tectonic plate model assumption,so the Euler vector of the South America plate derived from space geodetic data can better describe contemporary features of the South America plate motion than the geological model NNR-NUVEL1A that was determined based on the geological and geophysical data in several million years.But the differences of deformation in the South America plate based on these two models are very significant for contemporary crustal deformation measurement in mm/a accuracy,which shows present-day motion characteristic of the South America plate.

金双根, 朱文耀. 南美板块的运动和活动形变[J]. 武汉大学学报 ( 信息科学版), 2002, 27(4): 358-362.

引用本文:

金双根, 朱文耀. 南美板块的运动和活动形变[J]. 武汉大学学报 ( 信息科学版), 2002, 27(4): 358-362.

JIN Shuanggen, ZHU Wenyao. Motion and Active Deformation of South America Plate[J]. Geomatics and Information Science of Wuhan University, 2002, 27(4): 358-362.

Citation:

JIN Shuanggen, ZHU Wenyao. Motion and Active Deformation of South America Plate[J]. Geomatics and Information Science of Wuhan University, 2002, 27(4): 358-362.