Current motion and deformation of the Nazca Plate: new constraints from GPS measurements

被引:8
|
作者
Jarrin, P. [1 ]
Nocquet, J-M [2 ,3 ]
Rolandone, F. [1 ]
Mora-Paez, H. [4 ]
Mothes, P. [5 ]
Cisneros, D. [6 ]
机构
[1] Sorbonne Univ, CNRS INSU, Inst Sci Terre Paris, ISTeP,UMR 7193, F-75005 Paris, France
[2] Univ Cote Azur, IRD, CNRS, Observ Cote Azur,Geoazur, F-06560 Valbonne, France
[3] Univ Paris Cite, Inst Phys Globe Paris, F-75005 Paris, France
[4] Colombian Geol Survey, Space Geodesy Res Grp, Bogota 111321, Colombia
[5] Escuela Politecn Nacl Inst Geofis, Ladron de Guevara E11-253 Apartado, Quito 2759, Ecuador
[6] Inst Geog Mil Ecuador, Sect El Dorado, Quito 2435, Ecuador
关键词
Plate motions; Satellite geodesy; Pacific Ocean; South America; SIERRA-NEGRA-VOLCANO; SOUTH-AMERICA; M-W; CRUSTAL DEFORMATION; M-S; SUBDUCTION; EARTHQUAKE; COLOMBIA; ECUADOR; GALAPAGOS;
D O I
10.1093/gji/ggac353
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
We use new GPS data to determine an updated Euler pole describing the present-day motion of the oceanic Nazca Plate. Our solution includes continuous GPS (cGPS) measurements at Malpelo Island offshore Colombia, two sites in the Galapagos archipelago, Easter Island and Salas y Gomez Island in the western part of the plate and Robinson Crusoe Island offshore Chile. A careful analysis of geodetic time-series reveals that (1) previous estimates using former cGPS site EISL are biased by several millimetres per year eastward due to station malfunctioning (2) north velocity component of cGPS site GLPS at Santa Cruz Island in the Galapagos is impacted by volcanic deformation at the 1-2 mm yr(-1) level, probably caused by the recurrent volcanic activity of the Sierra Negra volcano. In addition, we find shortening at similar to 1 mm yr(-1) between Easter Island (cGPS ISPA) and Salas y Gomez Island (cGPS ILSG), consistent with the elastic deformation induced by rapid opening at the East Pacific rise. cGPS site at Robinson Crusoe Island shows similar to 4-5 mm yr(-1) abnormally fast East velocity induced by the visco-elastic relaxation following the Maule M-w 8.8 2010 earthquake. Using this information, we determine a new Euler pole (longitude: -90.93 degrees E, latitude 56.19 degrees N, 0.588 deg Myr(-1)) describing the present-day Nazca-South America Plate motion, using five sites (Malpelo Island, two sites in the Galapagos archipelago, Easter Island and Salas y Gomez Island). The proposed Euler pole provides a weighted root mean square (wrms) of residual velocities of 0.6 mm yr(-1), slightly higher than usually observed for other major tectonic plates and accounting for the uncertainty of potential volcanic-tectonic deformation. Our model predicts a maximum convergence rate at 65.5 +/- 0.8 mm yr(-1) at latitude similar to 30 degrees S along the Chile trench, decreasing to 50.8 +/- 0.7 mm yr(-1) in northern Colombia and 64.5 +/- 0.9 mm yr(-1) in southern Chile (1 sigma confidence level). Comparison with the geological models NUVEL1A and MORVEL indicates constant decrease since 3.16 Ma of opening rate along the Nazca-Antarctic Plate boundary spreading centres at similar to 1 cm yr(-1) per Myr. Combined with the ITRF2014 pole for the Pacific and Antarctic plates, our derived Euler pole predicts closure at the similar to 1 mm yr(-1) level for Pacific-Antarctic-Nazca Plate circuit. However, combining our results with MORVEL estimates for the Cocos Plate, the non-closure of the Pacific-Cocos-Nazca Plate circuit is 9.7 +/- 1.6 mm yr(-1), 30 per cent lower than the 14 +/- 5 mm yr(-1) reported in MORVEL model, but still significant. A small (similar to 1.5 mm yr(-1)) velocity residual at Malpelo Island neither supports the hypothesis of an independent Malpelo microplate offshore Colombia nor large scale internal deformation induced by thermal contraction. Our solution rather suggests that non-closure of the Pacific-Cocos-Nazca Plate circuit arises from the determination of the Cocos Plate motion in MORVEL, an hypothesis further supported by the large discrepancy between MORVEL's prediction and the observed GPS velocity observed at Cocos Islands (cGPS ISCO).
引用
收藏
页码:842 / 863
页数:22
相关论文
共 50 条
  • [1] New constraints on Antarctic plate motion and deformation from GPS data
    Bouin, MN
    Vigny, C
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2000, 105 (B12) : 28279 - 28293
  • [2] Present motion and deformation of the Caribbean plate: Constraints from new GPS geodetic measurements from honduras and Nicaragua
    DeMets, Charles
    Mattioli, Glen
    Jansma, Pamela
    Rogers, Robert D.
    Tenorio, Carlos
    Turner, Henry L.
    [J]. Special Paper of the Geological Society of America, 2007, 428 : 21 - 36
  • [3] New constraints on current deformation in Asia from continuous GPS measurements at Ulan Baatar, Mongolia
    Calais, E
    Amarjargal, S
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2000, 27 (10) : 1527 - 1530
  • [4] New constraints on relative motion between the Pacific Plate and Baja California microplate (Mexico) from GPS measurements
    Plattner, C.
    Malservisi, R.
    Dixon, T. H.
    LaFemina, P.
    Sella, G. F.
    Fletcher, J.
    Suarez-Vidal, F.
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2007, 170 (03) : 1373 - 1380
  • [5] Rigid Indian plate: Constraints from GPS measurements
    Mahesh, P.
    Catherine, J. K.
    Gahalaut, V. K.
    Kundu, Bhaskar
    Ambikapathy, A.
    Bansal, Amit
    Premkishore, L.
    Narsaiah, M.
    Ghavri, Sapna
    Chadha, R. K.
    Choudhary, Pallabee
    Singh, D. K.
    Singh, S. K.
    Kumar, Subhash
    Nagarajan, B.
    Bhatt, B. C.
    Tiwari, R. P.
    Kumar, Arun
    Kumar, Ashok
    Bhu, Harsh
    Kalita, S.
    [J]. GONDWANA RESEARCH, 2012, 22 (3-4) : 1068 - 1072
  • [6] Constraints from GPS measurements on the dynamics of deformation in Anatolia and the Aegean
    England, Philip
    Houseman, Gregory
    Nocquet, Jean-Mathieu
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2016, 121 (12) : 8888 - 8916
  • [7] A new GPS velocity field for the Pacific Plate - Part 1: constraints on plate motion, intraplate deformation, and the viscosity of Pacific basin asthenosphere
    DeMets, C.
    Marquez-Azua, Bertha
    Cabral-Cano, Enrique
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2014, 199 (03) : 1878 - 1899
  • [8] NEW TERRESTRIAL HEAT-FLOW MEASUREMENTS ON NAZCA PLATE
    ANDERSON, RN
    LANGSETH, MG
    VACQUIER, V
    FRANCHETEAU, J
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 1976, 29 (02) : 243 - 254
  • [9] Glacial isostatic adjustment of the British Isles: new constraints from GPS measurements of crustal motion
    Bradley, S. L.
    Milne, G. A.
    Teferle, F. N.
    Bingley, R. M.
    Orliac, E. J.
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2009, 178 (01) : 14 - 22
  • [10] A preliminary assessment of internal deformation in the Indian Plate from GPS measurements
    Catherine, JK
    [J]. JOURNAL OF ASIAN EARTH SCIENCES, 2004, 23 (04) : 461 - 465