Crustal motion north and south of the Arica deflection: Comparing recent geodetic results from the central Andes

被引：24

作者：

Bevis, Michael ^{[1
]}

Kendrick, Eric C. ^{[1
]}

Smalley, Robert, Jr. ^{[2
]}

Herring, Thomas ^{[3
]}

Godoy, Jorge ^{[4
]}

Galban, Fernando ^{[5
]}

机构：

[1] Univ Hawaii, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA

[2] Univ Memphis, Ctr Earthquake Res & Informat, Memphis, TN 38152 USA

[3] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[4] Inst Geog Militar Chile, Santiago, Chile

[5] Inst Geog Militar Argentina, Buenos Aires, DF, Argentina

来源：

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS | 1999年 / 1卷 / 12期

基金：

美国国家科学基金会;

关键词：

central Andes; GPS geodesy; crustal motion; reference frames;

D O I：

10.1029/1999GC000011

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

An intercomparison of recent velocity solutions for the Global Positioning System (GPS) networks constructed by the South American-Nazca Plate Project (SNAPP), based in Bolivia and Peru, and our Central Andes GPS Project (CAP), based in Chile and Argentina, indicates a velocity discontinuity of order 10 mm/yr near the boundary between these networks. We suggest that this velocity jump manifests measurement bias in the SNAPP velocity field. Our results indicate that no major slip partioning occurs within the forearc of northern Chile in response to the obliquity of subduction but that Nazca-South America plate convergence is partitioned between the forearc and the backarc regions. The present rate of shortening across the southern part of the sub-Andean belt in Argentina is 8.9 +/- 1.6 mm/yr.

引用

页数：10

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