Exploring Indigenous Perspectives of an Environmental Disaster Culture
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Universita' Degli Studi Di Milano Bicocca
Dipartimento di Scienze Ambiente e Territorio e Scienze della Terra Università degli studi di Milano-Bicocca Dottorato di Ricerca in Scienze della Terra XXVI ciclo Earthquake-induced static stress change in promoting eruptions Tutore: Prof. Alessandro TIBALDI Co-tutore: Dott.ssa Claudia CORAZZATO Fabio Luca BONALI Matr. Nr. 040546 This work is dedicated to my uncle Eugenio Marcora who led my interest in Earth Sciences and Astronomy during my childhood Abstract The aim of this PhD work is to study how earthquakes could favour new eruptions, focusing the attention on earthquake-induced static effects in three different case sites. As a first case site, I studied how earthquake-induced crustal dilatation could trigger new eruptions at mud volcanoes in Azerbaijan. Particular attention was then devoted to contribute to the understanding of how earthquake-induced magma pathway unclamping could favour new volcanic activity along the Alaska-Aleutian and Chilean volcanic arcs, where 9 seismic events with Mw ≥ 8 occurred in the last century. Regarding mud volcanoes, I studied the effects of two earthquakes of Mw 6.18 and 6.08 occurred in the Caspian Sea on November 25, 2000 close to Baku city, Azerbaijan. A total of 33 eruptions occurred at 24 mud volcanoes within a maximum distance of 108 km from the epicentres in the five years following the earthquakes. Results show that crustal dilatation might have triggered only 7 eruptions at a maximum distance of about 60 km from the epicentres and within 3 years. Dynamic rather than static strain is thus likely to have been the dominating “promoting” factor because it affected all the studied unrested volcanoes and its magnitude was much larger. -
Crustal Deformation Associated with the 1960 Earthquake Events in the South of Chile
Paper No. CDDFV CRUSTAL DEFORMATION ASSOCIATED WITH THE 1960 EARTHQUAKE EVENTS IN THE SOUTH OF CHILE Felipe Villalobos 1 ABSTRACT Large earthquakes can cause significant subsidence and uplifts of one or two meters. In the case of subsidence, coastal and fluvial retaining structures may therefore no longer be useful, for instance, against flooding caused by a tsunami. However, tectonic subsidence caused by large earthquakes is normally not considered in geotechnical designs. This paper describes and analyses the 1960 earthquakes that occurred in the south of Chile, along almost 1000 km between Concepción and the Taitao peninsula. Attention is paid to the 9.5 moment magnitude earthquake aftermath in the city of Valdivia, where a tsunami occurred followed by the overflow of the Riñihue Lake. Valdivia and its surrounding meadows were flooded due to a subsidence of approximately 2 m. The paper presents hypotheses which would explain why today the city is not flooded anymore. Answers can be found in the crustal deformation process occurring as a result of the subduction thrust. Various hypotheses show that the subduction mechanism in the south of Chile is different from that in the north. It is believed that there is also an elastic short-term effect which may explain an initial recovery and a viscoelastic long-term effect which may explain later recovery. Furthermore, measurements of crustal deformation suggest that a process of stress relaxation is still occurring almost 50 years after the main seismic event. Keywords: tectonic subsidence, 1960 earthquakes, Valdivia, crustal deformation, stress relaxation INTRODUCTION Tectonic subsidence or uplift is not considered in any design of onshore or near shore structures. -
Rising out of Poverty the Role of Self-Determination, Political Attitudes and Legitimacy in the Mapuche Movement
Lund University Master of Science International Development and Programme Management June 2013 Up-Rising Out of Poverty The Role of Self-Determination, Political Attitudes and Legitimacy in the Mapuche Movement Author: Karen A. Malmqvist Supervisor: Dr. Maria Andrea Nardi K. Malmqvist LUMID – June 2013 Abstract Chile is often portrayed as the paradigmatic case of a smooth transition from dictatorship to democracy, sustained by high rates of economic growth. This picture conceals a more complex reality of social conflict provoked by political reform that favors capitalistic advancement at the expense of resource exploitation and the continual and irreversible reduction and destruction of Mapuche land. As the clash between the indigenous group and the Chilean state intensify, this research explores how perceived levels of self- determination held by varying Mapuche leaders shape their political attitudes and legitimize their actions with or against the State. Conceptual frameworks and perspectives related to worldview, postcolonialism, neoliberal multiculturalism and self-determination construct the lens of the analysis. Ultimately, I contend that perceptions of self- determination and empowerment play a powerful role in shaping the relationship between Mapuche communities and the Chilean state and may serve as means of rising up and out of economic poverty. Up-Rising Out of Poverty 2 K. Malmqvist LUMID – June 2013 Table of Contents ACKNOWLEDGEMENTS 4 1. INTRODUCTION 5 1.1 Overview 5 1.2 Research Purpose 6 1.3 Research Question 6 1.4. Significance to Knowledge 7 1.5 Delimitations 8 2. BACKGROUND 8 2.1 Chile: An Introduction 8 2.2 Political Evolution of Chile 9 2.3 Up in Arms: The Mapuche and the Chilean State 10 3. -
Unexpected Coseismic Surface Uplift at Tirúa-Mocha Island Area of South Chile Before and During the Mw 8.8 Maule 2010 Earthquake: a Possible Upper Plate Splay Fault
Andean Geology 47 (2): 295-315. May, 2020 Andean Geology doi: 10.5027/andgeoV47n2-3057 www.andeangeology.cl Unexpected coseismic surface uplift at Tirúa-Mocha Island area of south Chile before and during the Mw 8.8 Maule 2010 earthquake: a possible upper plate splay fault Jorge Quezada1, Edilia Jaque2, Nicole Catalán1, Arturo Belmonte3, Alfonso Fernández2, Federico Isla4 1 Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción, Víctor Lamas 1290, Casilla 160-C, Concepción, Chile. [email protected]; [email protected] 2 Departamento de Geografía, Facultad de Arquitectura, Urbanismo y Geografía, Universidad de Concepción, Víctor Lamas 1290, Casilla 160-C, Concepción, Chile. [email protected]; [email protected] 3 Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Víctor Lamas 1290, Casilla 160-C, Concepción, Chile. [email protected] 4 Instituto de Geología de Costas y del Cuaternario (UNMDP-CIC), Instituto de Investigaciones Marinas y Costeras (CONICET-UNMDP), Deán Funes 3350, Mar del Plata, Argentina. [email protected] ABSTRACT. The Tirúa-Mocha Island area (38.2°-38.4° S) in southern Chile has been affected by two megaearthquakes in only 50 years: the 1960 Mw=9.5 Valdivia earthquake and 2010 Mw=8.8 Maule earthquake. We studied in the field the vertical ground movements occurred during the interseismic period between both earthquakes and the coseismic period of 2010 Maule earthquake and 2011 Mw=7.1 Araucanía earthquake. During the 1960 earthquake, vertical coseismic ground movements are typical of subduction related earthquakes with Mocha Island, located close to the trench, experienced bigger ground uplift (150 cm) than that occurred in Tirúa (-20 cm), place located in the continental margin at the latitude of Mocha Island. -
Earthquake in Chile
I N F O R M A T I O N FS 6 Earthquake in Chile Saturday 27 February 2010 Magnitude = 8.8 at 6.34 GMT Version 1 of 3 March 2010 The Seismic Hazard Facts Assessment Bureau On Saturday 27 February 2010 at 6.34 GMT (3.34 local time) a very high magnitude earthquake (Mw 8.8 – source USGS) struck the region of Maule in central Chile for Nuclear Facility (Figure 1). Located at 35.85 ° south latitude and 72.72 ° west longitude, its focus was Safety (BERSSIN) of around 6 km offshore from the coastal city of Constitución. Its depth is estimated at the French Institute around 35 km (USGS). for Radiological The quake set off a tsunami that crossed the Pacific. It severely damaged the coastal Protection and regions of Chile where an amplitude of around 2 to 3 metres was observed (2.34 m Nuclear Safety measured at Talcahuano according to the NOAA). The tsunami reached 1.50 m in Japan, 4 m in the Marquesas Islands, 3 m in the Samoan Islands and 2 m along the coasts of (IRSN) conducts Sakhalin Island (Russia). research and assessments on the The cities of Chillan, Concepción and Talcaà, within a 100-kilometre area, experienced external hazard the most violent tremors. The capital city of Santiago (325 km northeast of the epicentre) also shook for nearly a minute and a half and was significantly damaged. The posed by event had a very broad impact, affecting populations in a radius spanning several earthquakes in high- hundred kilometres (Argentina, Uruguay, Paraguay, Brazil). -
1028-2 Holocene Sediments from the Southern Chile Trench a Record Of
Journal of the Geological Society Holocene sediments from the Southern Chile Trench: a record of active margin magmatism, tectonics and palaeoseismicity Bianca Heberer, Georg Röser, Jan H. Behrmann, Meinert Rahn and Achim Kopf Journal of the Geological Society 2010; v. 167; p. 539-553 doi:10.1144/0016-76492009-015 Email alerting click here to receive free email alerts when new articles cite this article service Permission click here to seek permission to re-use all or part of this article request Subscribe click here to subscribe to Journal of the Geological Society or the Lyell Collection Notes Downloaded by National Centre University on 10 May 2010 © 2010 Geological Society of London Journal of the Geological Society, London, Vol. 167, 2010, pp. 539–553. doi: 10.1144/0016-76492009-015. Holocene sediments from the Southern Chile Trench: a record of active margin magmatism, tectonics and palaeoseismicity BIANCA HEBERER1*, GEORG RO¨ SER2, JAN H. BEHRMANN3, MEINERT RAHN4 &ACHIMKOPF5 1Department of Geography and Geology, University of Salzburg, Hellbrunner Strasse 34, 5020 Salzburg, Austria 2Anders Estenstads Veg 22, 7046 Trondheim, Norway 3IFM-GEOMAR, Wischofstrasse 1–3, 24148 Kiel, Germany 4ENSI, 5232 Villigen-ENSI, Switzerland 5RCOM, Universita¨t Bremen, Leobener Strasse, 28539 Bremen, Germany *Corresponding author (e-mail: [email protected]) Abstract: Sedimentology, petrography and the provenance of Holocene sediments from the Southern Chile Trench (36–478S) were investigated in an integrated approach combining description of a collection of gravity cores, measurements of physical properties, quantitative X-ray petrography and modal analysis. The sediments studied were trench hemipelagic sediments, fan deposits, and more distal hemipelagic sediments from the Nazca Plate. -
The Chiloé Mw 7.6 Earthquake of 25 December 2016 in Southern Chile and Its Relation to the Mw 9.5 1960 Valdivia Earthquake
2016 Chiloé Earthquake, Southern Chile submitted to Geophysical Journal International The Chiloé Mw 7.6 earthquake of 25 December 2016 in Southern Chile and its relation to the Mw 9.5 1960 Valdivia earthquake 1 2 3 3 Dietrich Lange , Javier Ruiz , Sebastián Carrasco , Paula Manríquez (1) GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany (2) Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile (3) National Seismological Centre, University of Chile, Santiago, Chile Keywords: 2016 Chiloé earthquake, Subduction Zone, Southern Chile, 1960 Valdivia Earthquake Corresponding author: Dietrich Lange (email: [email protected]) Abstract On 25 December 2016, a Mw 7.6 earthquake broke a portion of the Southern Chilean subduction zone south of Chiloé Island, located in the central part of the Mw 9.5 1960 Valdivia earthquake. This region is characterized by repeated earthquakes in 1960 and historical times with very sparse interseismic activity due to the subduction of a young (~15 Ma), and therefore hot, oceanic plate. We estimate the co-seismic slip distribution based on a kinematic finite fault source model, and through joint inversion of teleseismic body waves and strong motion data. The coseismic slip model yields a total seismic moment of 3.94×1020 Nm that occurred over ~30 s, with the rupture propagating mainly downdip, reaching a peak-slip of ~4.2 m. Regional moment tensor inversion of stronger aftershocks reveals thrust type faulting at depths of the plate interface. The fore- and aftershock seismicity is mostly related to the subduction interface with sparse seismicity in the overriding crust. -
The Sea Within: Marine Tenure and Cosmopolitical Debates
THE SEA WITHIN MARINE TENURE AND COSMOPOLITICAL DEBATES Hélène Artaud and Alexandre Surrallés editors IWGIA THE SEA WITHIN MARINE TENURE AND COSMOPOLITICAL DEBATES Copyright: the authors Typesetting: Jorge Monrás Editorial Production: Alejandro Parellada HURIDOCS CIP DATA Title: The sea within – Marine tenure and cosmopolitical debates Edited by: Hélène Artaud and Alexandre Surrallés Print: Tarea Asociación Gráfica Educativa - Peru Pages: 226 ISBN: Language: English Index: 1. Indigenous Peoples – 2. Maritime Rights Geografical area: world Editorial: IWGIA Publications date: April 2017 INTERNATIONAL WORK GROUP FOR INDIGENOUS AFFAIRS Classensgade 11 E, DK 2100 - Copenhagen, Denmak Tel: (+45) 35 27 05 00 – E-mail: [email protected] – Web: www.iwgia.org To Pedro García Hierro, in memoriam Acknowledgements The editors of this book would like to thank the authors for their rigour, ef- fectiveness and interest in our proposal. Also, Alejandro Parellada of IWGIA for the enthusiasm he has shown for our project. And finally, our thanks to the Fondation de France for allowing us, through the “Quels littoraux pour demain? [What coastlines for tomorrow?] programme to bring to fruition the reflection which is the subject of this book. Content From the Land to the Sea within – A presentation Alexandre Surrallés................................................................................................ .. 11 Introduction Hélène Artaud...................................................................................................... ....15 PART I -
Political Violence Against the Mapuche in Chile, 1850-1929
Journal of Historical Archaeology & Anthropological Sciences Review Article Open Access Political violence against the Mapuche in Chile, 1850-1929 Abstract Volume 3 Issue 6 - 2018 This article offers a comparative and historical perspective on political violence exercised against the Mapuche people of the Araucanía region in Chile. We consider Jorge Iván Vergara,1 Héctor Mellado2 two historical periods: the occupation (1850-1883), and the land-granting or radicación 1Academic Researcher, University of Concepción, Chile period (1884-1929). For each, we identify and compare the forms of violence and 2Mapuche Historian, Project assistant, University of Concepción, those responsible: namely, the Chilean State and para-state agents. During the Chile occupation, the conquest of territory predominated, primarily exercised by soldiers or the civil guard. In the land-granting period, political violence included eviction and Correspondence: Jorge Iván Vergara, Academic Researcher, the seizure of lands and resources, with the police and settlers being the main actors. University of Concepción, Chile, In both cases, political and judicial authorities shared responsibility. Violence against Email the Mapuche did not end in 1929, but continued at different levels and in different forms. Delineating the historical context of the violence, however, allows for a better Received: August 11, 2018 | Published: December 12, 2018 understanding of the relationship between the Chilean State and the Mapuche today. Keywords: Chile, Mapuche, Araucanía, political violence, radicación Introduction of Mapuche territory. Later, Villalobos nuances this position, stating: “although the 1880-1881 uprising was at moments tough, it wasn’t a Violence exercised by state and para-state agents against the daunting rebellion, but mostly made of fancy words, talks, fears and 1 Mapuche Indians of the Araucanía, the main indigenous group threats”.3 in Chile, has a long history. -
The 2010 Chile Earthquake: Observations and Research Implications
The 2010 Chile Earthquake: Observations and Research Implications Jeff Dragovich Jay Harris 9 December 2010 national earthquake hazards reduction program Presentation Outline • The earthquake and seismic hazard • Design practices Chile US/Canada • NIST mobilization • Observations: Reinforced concrete Steel Irregularities Separation/non-structural • Initiated Research national earthquake hazards reduction program What Will Not Be Covered • Detailed Seismology • Geotechnical • Transportation • Tsunami • Ports / harbors • Lifelines • Organizational Issues • Socio-economic national earthquake hazards reduction program “Ring of Fire” Nazca Plate national earthquake hazards reduction program World’s Largest Earthquakes No Rank Year Location Name Magnitude 1 1 1960 Valdivia, Chile 1960 Valdivia earthquake 9.5 2 2 1964 Prince William Sound, USA 1964 Alaska earthquake 9.2 3 3 2004 Sumatra, Indonesia 2004 Indian Ocean earthquake 9.1 4 4 1952 Kamchatka, Russia Kamchatka earthquakes 9.0 5 4 1868 Arica, Chile (then Peru) 1868 Arica earthquake 9.0 6 4 1700 Cascadia subduction zone 1700 Cascadia earthquake 9.0 7 7 2010 Maule, Chile 2010 Chile earthquake 8.8 10 10 1965 Rat Islands, Alaska, USA 1965 Rat Islands earthquake 8.7 11 10 1755 Lisbon, Portugal 1755 Lisbon earthquake 8.7 12 10 1730 Valparaiso, Chile 1730 Valparaiso earthquake 8.7 13 13 2005 Sumatra, Indonesia 2005 Sumatra earthquake 8.6 16 16 2007 Sumatra, Indonesia September 2007 Sumatra earthquakes 8.5 20 16 1922 Atacama Region, Chile 1922 Vallenar earthquake 8.5 21 16 1751 Concepción, Chile 1751 Concepción earthquake 8.5 22 16 1687 Lima, Peru 1687 Peru earthquake 8.5 23 16 1575 Valdivia, Chile 1575 Valdivia earthquake 8.5 national earthquake hazards reduction program Event Summary • The February 27th, 2010 magnitude 8.8 offshore Maule Chile earthquake is one of the 5 largest earthquakes ever recorded. -
EGU2018-4693, 2018 EGU General Assembly 2018 © Author(S) 2018
Geophysical Research Abstracts Vol. 20, EGU2018-4693, 2018 EGU General Assembly 2018 © Author(s) 2018. CC Attribution 4.0 license. The Chiloé Mw 7.6 earthquake of 25 December 2016 in Southern Chile: Rupture of an asperity of the Mw 9.5 1960 Valdivia earthquake Dietrich Lange (1), Javier Ruiz (2), Sebastián Carrasco (3), and Paula Manriquez (3) (1) GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2) Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile, (3) National Seismological Centre, University of Chile, Santiago, Chile On 25 December 2016, a Mw 7.6 earthquake broke a portion of the Southern Chilean subduction zone south of Chiloé Island, located in the central part of the Mw 9.5 1960 Valdivia earthquake. This region is characterized by repeated earthquakes in 1960 and historical times with very sparse interseismic activity due to the subduction of a young (∼15 Ma), and therefore hot, oceanic plate. We estimate the co-seismic slip distribution based on a kinematic finite fault source model, and through joint inversion of teleseismic body waves and strong motion data. The coseismic slip model yields a total seismic moment of 3.94×1020 Nm that occurred over ∼30 s, with the rupture propagating mainly downdip, reaching a peak-slip of ∼4.2 m. Regional moment tensor inversion of stronger aftershocks reveals thrust type faulting at depths of the plate interface. The fore- and aftershock seismicity is mostly related to the subduction interface with sparse seismicity in the overriding crust. The 2016 Chiloé event broke a region with increased locking and most likely broke an asperity of the 1960 earthquake. -
Field Visit Information (English)
FIELD INFORMATION General Background on Arauco Province and Contulmo Commune The Arauco Province, in the Biobio Region, borders to the north with the Concepción Province, to the east with Biobío and Malleco, to the south with the Cautín Province and to the Región del west with the Pacific Ocean. It is composed of 7 communes: Biobío Lebu, Arauco, Curanilahue, Cañete, Los Alamos, Contulmo, Tirúa. Provincia The Arauco Province is located in an area of few plains, de Arauco dominated by the Nahuelbuta Mountains on its eastern side. To the west there are a series of hills and valleys that descend Contulmo towards the ocean. It also has a number of lakes and ponds, including the Lleu-lleu and Lanalhue lakes. There is a vast reserve of native forest, especially in the Nahuelbuta area, with Araucaria, Boldo, and Canelo species, among others. There are also native animal species like the puma, huemul and pudu. According to the 2002 Census, the province has 158,916 inhabitants, with about 20% rural population. There is a large indigenous population, particularly Mapuche, although unevenly distributed in the communes of the province (more concentrated towards the south). The percentage of communal population that identifies as indigenous is as follows: Tirúa 47.5%, Cañete 20.6%, Contulmo 18.3%, Los Alamos 13.3%, Lebu, 12.7%, Curanilahue 5.4%, Arauco 4.7%. This Province has historically high poverty levels. According to the latest CASEN survey (2013, traditional methodology), 16.7% of the population are living in poverty and 5% in extreme poverty. This is higher than the regional average (12.3% population in poverty) and national (7.8% population living in poverty).