scholarly journals On the strength of interplate coupling and the rate of back arc convergence in the central Andes: An analysis of the interseismic velocity field

2001 ◽  
Vol 2 (11) ◽  
pp. n/a-n/a ◽  
Author(s):  
Michael Bevis ◽  
Eric Kendrick ◽  
Robert Smalley ◽  
Benjamin Brooks ◽  
Richard Allmendinger ◽  
...  
Keyword(s):  
Velocity Field ◽  
Central Andes ◽  
Interplate Coupling ◽  
Back Arc ◽  
Interseismic Velocity

scholarly journals Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina

2013 ◽  
Vol 54 (10) ◽  
pp. 1963-1995 ◽  
Author(s):  
A. Risse ◽  
R. B. Trumbull ◽  
S. M. Kay ◽  
B. Coira ◽  
R. L. Romer
Keyword(s):  
Central Andes ◽  
Multi Stage ◽  
Late Neogene ◽  
Puna Plateau ◽  
Back Arc

scholarly journals Crustal Deformation of the Kendeng Fault Branches Area from GNSS and InSAR Data in Surabaya City, Indonesia

2021 ◽  
Vol 936 (1) ◽  
pp. 012019
Author(s):  
R H Ayani ◽  
K E Ching ◽  
I M Anjasmara ◽  
Y N Lin
Keyword(s):  
Velocity Field ◽  
Active Faults ◽  
Satellite System ◽  
Slip Rates ◽  
Metropolitan Cities ◽  
Small Baseline Subset ◽  
Small Baseline ◽  
Pass Through ◽  
Global Navigation Satellite ◽  
Interseismic Velocity

Abstract Slip rates on active faults derived from the interseismic velocity field are critical to understanding seismic hazards in metropolitan cities. This study integrated the data from the Global Navigation Satellite System (GNSS) and Interferometric Synthetic Aperture Radar (InSAR) to evaluate the interseismic velocities in the second-largest city in Indonesia, Surabaya, where branches of the Kendeng fault (the Surabaya and the Waru faults) pass through. Data from 16 campaign-mode GNSS stations collected between 2017 and 2020 from previous research are reprocessed to estimate the velocity field. Horizontal velocities under the ITRF frame range between -23.8 mm/yr and 47.9 mm/yr toward the southeast. Vertical velocities generally range between -1.3 mm/yr and -112.2 mm/yr. Sentinel-1A SAR data of both ascending and descending tracks acquired between November 2014 and July 2020 were used to generate the interferograms with the InSAR Scientific Computing Environment (ISCE) software. Furthermore, cumulative displacement time series were constructed using the Small BAseline Subset (SBAS) technique within the Generic InSAR Analysis Toolbox (GIAnT). This study also carried out the detection of outlier SAR epochs to improve the precision of Line-of-sight (LOS) velocity estimates. The LOS velocities range from -14.8 to 10.8 mm/yr in the ascending track and from -12.7 to 9.5 mm/yr in the descending track. These results will facilitate the detection of coupling behaviors on the Kendeng fault branches, which can improve our understanding of seismic risks in the Surabaya area.

Interseismic Velocity Field and Seismic Moment Release in Northern Baja California, Mexico

2018 ◽  
Vol 89 (2A) ◽  
pp. 526-533 ◽  
Author(s):  
J. Alejandro González‐Ortega ◽  
J. Javier González‐García ◽  
David T. Sandwell
Keyword(s):  
Velocity Field ◽  
Seismic Moment ◽  
Baja California ◽  
Seismic Moment Release ◽  
Interseismic Velocity

Neogene shortening contribution to crustal thickening in the back arc of the Central Andes

Geology ◽  
1997 ◽  
Vol 25 (10) ◽  
pp. 883 ◽  
Author(s):  
Patrice Baby ◽  
Philippe Rochat ◽  
Georges Mascle ◽  
Gérard Hérail
Keyword(s):  
Central Andes ◽  
Crustal Thickening ◽  
Back Arc

scholarly journals Tectonomagmatic characteristics of the back-arc portion of the Calama-Olacapato-El Toro Fault Zone, Central Andes

Tectonics ◽  
2011 ◽  
Vol 30 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
V. Acocella ◽  
A. Gioncada ◽  
R. Omarini ◽  
U. Riller ◽  
R. Mazzuoli ◽  
...  
Keyword(s):  
Fault Zone ◽  
Central Andes ◽  
Back Arc

scholarly journals Southern Central Andes Neogene magmatism over the Pampean Flat Slab: implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina

2017 ◽  
Vol 44 (3) ◽  
pp. 249 ◽  
Author(s):  
Stella Poma ◽  
Adriana Ramos ◽  
Vanesa D. Litvak ◽  
Sonia Quenardelle ◽  
Emma B. Maisonnave ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Central Andes ◽  
Progressive Increase ◽  
Geochemical Data ◽  
Transitional Region ◽  
Continuous Increase ◽  
Volcanic Arc ◽  
Age Variations ◽  
Southern Central ◽  
Back Arc

A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the f lat slab segment of the Southern Central Andes, at 29º30’ S to 30º00’ S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arcrelated sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineralphase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual f lattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related f luids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably ref lect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface.

Geomorphological evolution of the Chimpa stratovolcano in the back-arc region of the Central Andes

Geomorphology ◽  
2020 ◽  
Vol 364 ◽  
pp. 107251 ◽  
Author(s):  
Emilce Bustos ◽  
Marcelo Arnosio ◽  
Walter Báez ◽  
Gianluca Norini ◽  
Néstor Omar Suzaño ◽  
...  
Keyword(s):  
Central Andes ◽  
Geomorphological Evolution ◽  
Back Arc
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