Chapter 13

SGC, Servicio Geológico Colombiano

doi:10.32685/pub.esp.38.2019.13

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…The recent results of neotectonics, paleoseismology, and paleomagnetism allowed Diederix et al (2020b), in chapter 13, to quantitatively corroborate the quaternary activity of the Bucaramanga Fault. The authors report that recent activity is not reflected in instrumental seismicity, while geomorphological expression suggests high displacement rates during the Pleistocene.…”

Section: Volume 4 Quaternarymentioning

confidence: 91%

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SGC¹

2019

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The number of research papers and brand new geoscientific data of the Colombian territory has increased progressively in recent years. This has generated the rise of new hypotheses to explain the origin of what is now Colombia, but also the updating of pioneering ideas. This fact, added to the need to gather the increasing amount of information produced by different areas of the Earth sciences, encouraged the Servicio Geológico Colombiano to edit the first scientific book about The Geology of Colombia. The aim of this chapter is to describe The Geology of Colombia in terms of how the editorial process was outlined, the main issues considered to improve texts and figures, and the content the reader will find in each chapter. It also presents the scientific outreach strategy designed paralleled to the editorial process which includes two audiences mainly: one created for scientists based on topical sessions related to the geology of Colombia and oral presentations in scientific conferences, and secondly a strategy aimed at the general public which consisted in writing stories that were published in national and local newspapers, and producing multimedia content for social media and the web page. As a result, the editorial work presented in four volumes includes 58 chapters, almost three times the initial projection, written by 179 researchers and edited according to the international quality standards. On the other hand, the number of readers of the articles published in the newspapers as well as the engagement of the social media content by diverse audiences reflects the multidisciplinary and well-oriented work during the process.

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Section: Volume 4 Quaternarymentioning

confidence: 91%

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SGC¹

2019

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Geochemical and isotopic study of formations aquifers in a high mountain system: the Santander Massif (Colombia)

Cetina,

Taupin,

Gómez

et al. 2024

Sustain. Water Resour. Manag.

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Continental block motion in the Northern Andes from GPS measurements

Jarrin,

Nocquet,

Rolandone

et al. 2023

Geophysical Journal International

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Summary Northwestern South America is a plate boundary zone where the Nazca, Caribbean and South American plates interact to produce a wide area of active continental deformation from the Gulf of Guayaquil (latitude 3○S) to Venezuela. Previous studies have identified a ∼2000 km long continental sliver, referred as the North Andean Sliver (NAS), squeezed between the Nazca, Caribbean, and South American plates, and escaping at ∼1 cm/yr northeastward with respect to South America. Subduction of the Nazca plate beneath the NAS has produced a sequence of large and great earthquakes during the 20th century along the coast of Ecuador and Colombia. Large crustal earthquakes up to magnitude 7.7 have been documented along the proposed eastern boundary of the NAS. However, active tectonics data, historical and recent earthquakes all indicate active fault systems within the NAS, possibly resulting from the interaction of several tectonic blocks. Here, we derive an extensive horizontal velocity field using continuous and episodic GNSS data from 1994 to 2019.9, covering northern Peru, Ecuador, Colombia, Panama and Venezuela. We model the GNSS velocity field using a kinematic elastic block approach that simultaneously solves for rigid tectonic block rotations and interseismic coupling along the subduction interfaces and along major crustal faults. In contrast to previous results that considered a single rigid NAS, our dense GNSS velocity field demonstrates that the NAS undergoes significant internal deformation and cannot be modeled as single rigid block. We find that block kinematics in the northern Andes are well described by the rotation of 6 tectonic blocks, showing increasing eastward motion from south to north. The Eastern boundary of the sliver is defined by a right-lateral transpressive fault system accommodating 5.6 to 17 mm/yr of motion. Fragmentation of the NAS occurs through several fault systems with slip rates of 2-4 mm/yr. Slow reverse motion is found across the sub-Andean domain in Ecuador and northern Peru at 2-4 mm/yr, marking a transitional area between the NAS and stable South America. In contrast, such a transitional sub-Andean domain does not exist in Colombia and western Venezuela. At the northwestern corner of Colombia, fast (∼15 mm/yr) eastward motion of the Panama block with respect to the NAS results in arc-continent collision. We propose that the Uramita fault and Eastern Panama Deformed Zone define the current Panama/NAS boundary, accommodating 6 and 15 mm/yr of relative motion, respectively. A fraction of the Panama motion appears to transfer northeastward throughout the San Jacinto fold belt and as far east as longitude ∼75○W. Along the Caribbean coast, our model confirms, slow active subduction at ∼4.5 mm/yr along the South Caribbean Deformed Belt offshore northern Colombia and a relatively uniform rate of ∼1-2 mm/yr offshore northern Venezuela. Along the Nazca/NAS subduction interface, interseismic coupling shows a first-order correlations between highly locked patches and large past earthquake ruptures. These patches are separated by narrow zones of low/partial coupling where aseismic transients are observed. Compared to previous studies, our interseismic coupling model highlights the presence of deep coupling down to 70 km in Ecuador.

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Chapter 13

Cited by 3 publications

References 43 publications

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Geochemical and isotopic study of formations aquifers in a high mountain system: the Santander Massif (Colombia)

Continental block motion in the Northern Andes from GPS measurements

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