Mario Pardo
Universidad de Chile, Department of Geophysics, Faculty Member
The Central Andes are the Earth's highest mountain belt formed by ocean-continent collision. Most of this uplift is thought to have occurred in the past 20 Myr, owing mainly to thickening of the continental crust,... more
The Central Andes are the Earth's highest mountain belt formed by ocean-continent collision. Most of this uplift is thought to have occurred in the past 20 Myr, owing mainly to thickening of the continental crust, dominated by tectonic shortening. Here we use P-to-S (compressional-to-shear) converted teleseismic waves observed on several temporary networks in the Central Andes to image the deep structure associated with these tectonic processes. We find that the Moho (the Mohorovicić discontinuity--generally thought to separate crust from mantle) ranges from a depth of 75 km under the Altiplano plateau to 50 km beneath the 4-km-high Puna plateau. This relatively thin crust below such a high-elevation region indicates that thinning of the lithospheric mantle may have contributed to the uplift of the Puna plateau. We have also imaged the subducted crust of the Nazca oceanic plate down to 120 km depth, where it becomes invisible to converted teleseismic waves, probably owing to completion of the gabbro-eclogite transformation; this is direct evidence for the presence of kinetically delayed metamorphic reactions in subducting plates. Most of the intermediate-depth seismicity in the subducting plate stops at 120 km depth as well, suggesting a relation with this transformation. We see an intracrustal low-velocity zone, 10-20 km thick, below the entire Altiplano and Puna plateaux, which we interpret as a zone of continuing metamorphism and partial melting that decouples upper-crustal imbrication from lower-crustal thickening.
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... DIANA COMTE and MARIO PARDO Departamento de Geologia y Geofisica, Division de Geofisica, Facultad de Ciencias Fisieas y Mathematicas, Universidad de Chile, Casilla 2777, Santiago, Chile (Received: 8 September 1989) ... 24 DIANA COMTE... more
... DIANA COMTE and MARIO PARDO Departamento de Geologia y Geofisica, Division de Geofisica, Facultad de Ciencias Fisieas y Mathematicas, Universidad de Chile, Casilla 2777, Santiago, Chile (Received: 8 September 1989) ... 24 DIANA COMTE AND MARIO PARDO ...
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... Günter Asch · Bernd Schurr · Mirjam Bohm · Xiaohui Yuan · Christian Haberland · Benjamin Heit · Rainer Kind Ingo Woelbern · Klaus Bataille · Diana Comte · Mario Pardo · Jose Viramonte · Andreas ... three-dimensional model for vp,... more
... Günter Asch · Bernd Schurr · Mirjam Bohm · Xiaohui Yuan · Christian Haberland · Benjamin Heit · Rainer Kind Ingo Woelbern · Klaus Bataille · Diana Comte · Mario Pardo · Jose Viramonte · Andreas ... three-dimensional model for vp, vp/vs and Qp of the en-tire subduction zone. ...
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... P-wave teleseismic and local receiver function analyses from Gilbert et al.(2006) and Calkins et al.(2006) for a CHARGE station located in the western flank of Sierra Pie de Palo (station JUANin Fig. 2) are more sensitive to impedance... more
... P-wave teleseismic and local receiver function analyses from Gilbert et al.(2006) and Calkins et al.(2006) for a CHARGE station located in the western flank of Sierra Pie de Palo (station JUANin Fig. 2) are more sensitive to impedance contrasts across discontinuities. Page 283. ...
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Historic, as well as teleseismically, and locally recorded seismicity of the subduction margin of Copiapo, northern Chile is analysed. An on-and off-shore temporary network was deployed during 2 months in the region in order to obtain a... more
Historic, as well as teleseismically, and locally recorded seismicity of the subduction margin of Copiapo, northern Chile is analysed. An on-and off-shore temporary network was deployed during 2 months in the region in order to obtain a detailed definition of the WadatiBenioff ...
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The slip distribution of the M w 7.7 Tocopilla earthquake was obtained from the joint inversion of teleseismic and strong-motion data. Rupture occurred as underthrusting at the base of the seismically coupled plate interface, mainly... more
The slip distribution of the M w 7.7 Tocopilla earthquake was obtained from the joint inversion of teleseismic and strong-motion data. Rupture occurred as underthrusting at the base of the seismically coupled plate interface, mainly between 35 and 50 km depth. From the ...
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The Nazca plate subducts beneath central Chile and western Argentina (29°-34°S) with a dip angle ~27° from the trench until ~100 km depth. North of 32oS the slab becomes sub-horizontal at this depth and continues sub-horizontally for... more
The Nazca plate subducts beneath central Chile and western Argentina (29°-34°S) with a dip angle ~27° from the trench until ~100 km depth. North of 32oS the slab becomes sub-horizontal at this depth and continues sub-horizontally for approximately 250 km eastward before ...
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GEOPHYSICAL RESEARCH LETTERS, VOL. 26, NO. 13, PAGES 1965-1968, JULY 1,1999 A Double-Layered Seismic Zone in Arica, Northern Chile Diana Comte, Louis Dorbath, Mario Pardo, Tony Monfret, Henri Haessler, Luis Rivera, Michel Frogneux, Bianca... more
GEOPHYSICAL RESEARCH LETTERS, VOL. 26, NO. 13, PAGES 1965-1968, JULY 1,1999 A Double-Layered Seismic Zone in Arica, Northern Chile Diana Comte, Louis Dorbath, Mario Pardo, Tony Monfret, Henri Haessler, Luis Rivera, Michel Frogneux, Bianca Glass, and ...