Abstract
In order to study both the interplate seismic loading cycle and the distribution of intraplate deformation of the Andes, a 215 site GPS network covering Chile and the western part of Argentina was selected, monumented and observed in 1993 and 1994. A dense part of the network in northern Chile and northwest Argentina, comprising some 70 sites, was re-observed after two years in October/November, 1995. The M w = 8.0 Antofagasta (North Chile) earthquake of 30th July, 1995 took place between the two observations. The city of Antofagasta shifted 80 cm westwards by this event and the displacement still reached 10 cm at locations 300 km from the trench. Three different deformation processes have been considered for modeling the measured displacements: (1) interseismic accumulation of elastic strain due to subduction coupling, (2) coseismic strain release during the Antofagasta earthquake and (3) crustal shortening in the Sub-Andes.
Eastward displacement of the sites to the north and to the south of the area affected by the earthquake is due to the interseismic accumulation of elastic deformation. Assuming a uniform slip model of interseismic coupling, the observed displacements at the coast require a fully locked subduction interface and a depth of seismic coupling of 50 km. The geodetically derived fault plane parameters of the Antofagasta earthquake are consistent with results derived from wave-form modeling of seismological data. The coseismic slip predicted by the variable slip model reaches values of 3.2 m in the dip-slip and 1.4 m in the strike-slip directions. The derived rake is 66°. Our geodetic results suggest that the oblique Nazca-South American plate convergence is accommodated by oblique earthquake slip with no slip partitioning. The observed displacements in the back-arc indicate a present-day crustal shortening rate of 3–4 mm/year which is significantly slower than the average of 10 mm/year experienced during the evolution of the Andean plateau.
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References
Allmendinger, R. W., Ramos, V. A., Jordan, T. E., Palma, M., and Isacks, B. L. (1989), Neotectonic Deformation of the Southern Puna Plateau, Northwest Argentina, Tectonics 2, 1–16.
Allmendinger, R. W., Jordan, T. E., Kay, S. M., and Isacks, B. L. (1997), The Evolution of the Altiplano-Puna Plateau of the Central Andes, Ann. Rev. Earth Planet. Sci. 25, 139–174.
Angermann, D., Baustert, G., Klotz, J., Reinking, J., and Zhu, S. Y., The impact of IGS on the analysis of regional GPS-Networks. In GPS Trends in Precise Terrestrial, Airborne, and Space Applications, IAG Symp. Series 115 (Springer Verlag, Heidelberg 1996) pp. 35–39.
Angermann, D., Baustert, G., Galas, R., and Zhu, S. Y. (1997), EPOS.P.V3 (Earth Parameter and Orbit System): Software User Manual for GPS Data Processing, Scientific Technical Report, STR97/14, GeoForschungsZentrum Potsdam, 52 pp.
Angermann, D., Klotz, J., and Reigber, C. (1999), Space-geodetic Estimation of the Nazca-South America Euler Vector, Earth Planet. Sci. Lett., in review.
Arabasz, W. J. (1971), Geological and Geophysical Studies of the Atacama Fault Zone in Northern Chile, Ph.D. Thesis, California Inst. Technol., Pasadena, California, 264 pp.
Armijo, R., and Thiele, R. (1990), Active Faulting in Northern Chile: Ramp Stacking and Lateral Decoupling along a Subduction Plate Boundary? Earth Planet. Sci. Lett. 98, 40–61.
Assumpccao, M., and Araujo, M. (1993), Effect of the Altiplano-Puna Plateau, South America, on the Regional Intraplate Stresses, Tectonophysics 221, 475–496.
Boucher, C., Altamimi, Z., Feissel, M., and Sillard, P. (1996), Results and Analysis of the ITRF94, IERS Tech. Note, 20, 198 pp.
Boucher, C., Altamimi, Z., and Sillard, P. (1998), Results and Analysis of the ITRF96, IERS Tech. Note, 24, 166 pp.
Cahill, T., Isacks, B. L., Whitman, D., Chatelain, J.-L., Perez, A., and Chiu, J.-M. (1992), Seismicity and Tectonics in Jujuy Province, Northwestern Argentina, Tectonics 11, 944–959.
Comte, D., Pardo, M., Dorbath, J., Haessler, H., Rivera, L., Cisternas, A., and Ponce, L. (1994), Determination of the Seismogenic Interplate Contact Zone and Crustal Seismicity around Antofagasta, Northern Chile Using Local Data, Geophys. J. Int. 116, 553–561.
Delouis, B., Philip, H., and Dorbarth, L. (1995), Recent Fore-arc Tectonics in the Antofagasta Region, Northern Chile, International Geologic Correlation Program Project 367: Late Quaternary Coastal Records of Rapid Change, 2nd Annual Meeting in Antofagasta, Chile.
Delouis, B., Cisternas, A., Dorbath, L., Rivera, L., and Kausel, E. (1996), The Andean Subduction Zone between 22 and 25 Degrees S (Northern Chile): Precise Geometry and State of Stress, Tectonophysics 259, 81–100.
Delouis, B., Monfret, T., Dorbath, L., Pardo, M., Rivera, L., Comte, D., Haessler, H., Caminade, J.-P., Ponce, L., Kausel, E., and Cisternas, A. (1997), The M w=8.0 Antofagasta (Northern Chile) Earthquake of 30 July 1995; A Precursor to the End of the Large 1877 Gap, Bull. Seismol. Soc. Am. 87, 427–445.
DeMets, C., Gordon, R. G., Argus, D. F., and Stein, S. (1994), Effect of Recent Revisions to the Geomagnetic Reversal Time Scale on Estimates of Current Plate Motions, Geophys. Res. Lett. 21, 2191–2194.
Gubbels, T. L., Isacks, B. L., and Farrar, E. (1993), High-level Surface, Plateau Uplift, and Foreland Development, Bolivian Central Andes, Geology 21, 695–698.
Ihmlé, P. F., and Ruegg, J.-C. (1997), Source Tomography by Simulated Annealing Using Broad-band Surface Waves and Geodetic Data: Application to the M w =8.1 Chile 1995 Event, Geophys. J. Int. 131, 146–158.
Isacks, B. L. (1988), Uplift of the Central Andean Plateau and Bending of the Bolivian Orocline, J. Geophys. Res. 93, 3211–3231.
James, D. E., and Snoke, J. A. (1994), Structure and Tectonics in the Region of Flat Subduction beneath Central Peru: Crust and Uppermost Mantle, J. Geophys. Res. 99, 6899–6912.
Kelleher, J. (1972), Rupture Zones of Large South American Earthquakes and Some Prediction,J. Geophys. Res. 77, 2087–2103.
Kley, J., Müller, J., Tawackoli, S., Jakobshagen, V., and Manutsoglu, E. (1997), Pre-Andean and Andean-age Deformation in the Eastern Cordillera of Southern Bolivia, J. South Am. Earth Sci. 10, 1–19.
Klotz, J., and Lelgemann, D., Present State of the Central Andean GPS-Traverse ANSA, GPS-Tech-niques Applied to Geodesy and Surveying, Lecture Notes in Earth Sciences (eds. Groten, E., Strauß, R.) (Springer Verlag, Berlin 1989) pp. 427–436.
Klotz, J., Lelgemann, D., Gehlich, U., Kausel, E., Viramonte, J., Crustal Dynamic Investigations in the Central Andes Using GPS, Recent Geodetic and Gravimetric Research in Latin America (eds. Torge, W., Gonzalez Flechter, A., Tanner, J.) IAG Symposia 111 (Springer Verlag, Berlin 1993) pp. 192–201.
Larsen, S., Reilinger, R., Neugebauer, H., and Strange, W. (1992), Global Positioning System Measurements of Deformations Associated with the 1987 Superstition Hills Earthquake: Evidence for Conjugate Faulting, J. Geophys. Res. 97, 4885–4902.
Leffler, L., Stein, S., Mao, A., Dixon, T., Ellis, M. A., Ocola, L., and Sacks, I. S. (1997), Constraints on Present-day Shortening Rate across the Central Andes from GPS, Geophys. Res. Lett. 24, 1031–1034.
Naranjo, J. A. (1987), Interpretation de la actividad Cenozoica superior a lo largo de la Zona de Falla Atacama, norte de Chile, Revista geol. Chile 31, 43–55.
Nishenko, S. P., and Mccann, W. R., Seismic potential for the world’s major plate boundaries. In Earthquake Prediction: An International Review. Maurice Ewing Series 4 (D. W. Simpson and P. G. Richards, eds.) (AGU, Washington D.C. 1981) 20–2
Norabuena, E., Leffler-Griffin, L., Mao, A., Dixon, T., Stein, S., Sacks, L S., Ocola, L., and Ellis, M. (1998), Space Geodetic Observations of Nazca-South America Convergence across the Central Andes, Science 279, 358–362.
Okada, A. (1971), On the Tectonics of the Atacama Fault Zone Region—Preliminary Notes on Late Cenozoic Faulting and Geomorphic Development of the Coastal Range of Northern Chile, Bull. Geol. Univ. Tokyo 3, 47–65.
Okada, Y. (1985), Surface Deformation to Shear and Tensile Faults in a Half Space, Bull. Seismol. Assoc. Am. 75, 1135–1154.
Okaya, N., Tawackoli, S., and Giese, P. (1997), Area-balanced Model of the Late Cenozoic Tectonic Evolution of the Andes Arc and Back-arc (20–22S), Geology 25, 367–370.
Porth, R. (1997), Numerische Modellierungen (FE) der Lithosphärendynamik zur Untersuchung der Mechanik der andinen Plateauentwicklung, Dissertation, Scientific Technical Report, STR97/07, GeoForschungsZentrum Potsdam, 127 pp.
Reigber, C., Xia, Y., Michel, G., Klotz, J., and Angermann, D. (1997), The Antofagasta 1995 Earthquake: Crustal Deformation Pattern as Observed by GPS and D-INSAR, Proceedings of 3, ERS Symposium, Florence, 507–513.
Ruegg, J. C., Campos, J., Armijo, R., Barrientos, S., Briole, P., Thiele, R., Arancibia, M., Canuta, J., Duquesnoy, T., Chang, M., Lazo, D., Lyon-Caen, H., Ortlieb, L., Rossignol, J. C., and Serruier, L. (1996), The M w =8.1 Antofagasta (North Chile) Earthquake of July 30, 1995: First Results from Teleseismic and Geodetic Data, Geophys. Res. Lett. 23, 917–920.
Russo, R. M., and Silver, P. G. (1996), Cordillera Formation, Mantle Dynamics, and the Wilson Cycle, Geology 24, 511–514.
Savage, J. C. (1983), A Dislocation Model of Strain Accumulation and Release at a Subduction Zone, J. Geophys. Res. 88, 4984–4996.
Schmitz, M. (1994), A Balanced Model of the Southern Central Andes, Tectonics 13, 484–492.
Schmitz, M., and Kley, J. (1997), The Geometry of the Central Andean Back-arc Crust: Joint Interpretation of Cross-section Balancing and Seismic Refraction Data, J. South Am. Earth Sci. 10, 99–110.
Sempere, T., H’erail, G., Oller, J., and Bonhomme, M. G. (1990), Late Oligocene-early Miocene Major Tectonic Crisis and Related Basins in Bolivia, Geology 18, 946–949.
Sheffels, B. M. (1990), Lower Bound on the Amount of Crustal Shortening in the Central Bolivian Andes, Geology 18, 812–815.
Silver, P. G., Russo, R. M., and Lithgow-Bertelloni, C. (1998), Coupling of South America and Africa Plate Motion and Plate Deformation, Science 279, 60–63.
Sobiesiak, M., and Baumbach, M. (1998), First Results from Investigations on Aftershocks of the North Chilean Earthquake 1995, Antofagasta, Sonderband der DGEB: Immediate Post Earthquake Investigations—a German Contribution to IDNDR, in print, Hrsg. UNESCO, DGEB, GFZ, 8 pp.
Suarez, G., Molnar, P., and Burchfield, B. C. (1983), Seismicity, Fault Plane Solutions, Depths of Faulting and Active Tectonics of the Andes of Peru, Ecuador and Southern Colombia, J. Geophys. Res. 8810, 403–10,428.
Tichelaar, B. W., and Ruff, L. J. (1991), Seismic Coupling along the Chilean Subduction Zone, J. Geophys. Res. 9611, 997–12,022.
Wdowinski, S., and O’connell, R. J. (1991), Deformation of the Central Andes (15°–27°S) Derived from a Flow Model of Subduction Zones, J. Geophys. Res. 9612, 245–12,255.
Wessel, P., and Smith, W. H. F. (1995), New Version of the Generic Mapping Tools Released, EOS, Trans. AGU 76(33), 329.
Whitman, D., Isacks, B. L., and Kay, S. M. (1996), Lithospheric Structure and Along-strike Segmentation of the Central Andean Plateau, Seismic Q, Magmatism, Flexure, Topographic and Tectonics, Tectonophysics 259, 29–40.
Yu, G., Wesnousky, S. G., and Ekström, G. (1993), Slip Partitioning along Major Convergent Plate Boundaries, Pure appl. geophys. 140, 183–210.
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Klotz, J. et al. (1999). GPS-derived Deformation of the Central Andes Including the 1995 Antofagasta M w = 8.0 Earthquake. In: Sauber, J., Dmowska, R. (eds) Seismogenic and Tsunamigenic Processes in Shallow Subduction Zones. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8679-6_14
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DOI: https://doi.org/10.1007/978-3-0348-8679-6_14
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