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Ocean island volcanoes constitute some of the most prominent and rapidly-formed features on Earth, and yet they cannot be explained by conventional plate tectonics. Although typically associated with intraplate settings (hotspots), these volcanoes also occur in different geodynamic settings (near mid-ocean ridges). The nature of ocean island magmatism is still the subject of intense debate within the geological community. Traditionally it has been linked to the presence of mantle plumes at depth (e.g. Hawaii), although the interaction with plate tectonics is also recognized to play a significant role (e.g. Azores, Galápagos). Magma compositions may range from basaltic to more differentiated...
This open access book explores El Hierro Island, which is geologically the youngest of the Canary Islands (Spain). Having registered its latest volcanic eruption in 2011-2012, it is an oceanic subtropical island with low population pressure and a largely unchanged natural landscape. Accordingly, a great geodiversity of volcanic morphologies and erosion processes has been preserved. In addition, half of the land is protected as a Biosphere Reserve and as a UNESCO Global Geopark, and the island is pursuing energy self-sufficiency. Local tourism is a sustainable activity, as the main attractions are either diving or hiking through the island’s various volcanic landscapes. Covering these and other aspects, and using accessible language, the book will appeal to scientists specialized in geotourism, active leisure entrepreneurs, and members of the general public interested in volcanic geoheritage and geotourism.
This book addresses the main enigmas of Easter Island’s (Rapa Nui, in the Polynesian language) prehistory from the time of initial settlement to European contact with a multidisciplinary perspective. The main topics include: (i) the time of first settlement and the origin of the first settlers; (ii) the main features of prehistoric Rapanui culture and their changes; (iii) the deforestation of the island and its timing and causes; (iv) the extinction of the indigenous biota, (v) the occurrence of climatic shifts and their potential effects on socioecological trends; (vi) the evidence for a cultural and demographic collapse before European contact; and (vii) the influence of Europeans on pre...
Questions national identity by investigating the creation of memory and meaning.
People experience disasters very differently. Conflicts about a »correct« interpretation of the risks might arise. The side-by-side of different truths lead to people seeing mismanagement and disinformation. The volcanic crisis of El Hierro shows how rivalling interpretations amongst affected islanders, the media, sciences, and disaster response institutions cause great social tensions and scepticism towards scientific information. Thus, to fully understand disaster risk, the focus must shift to the rifts between established convictions and the individuals' creativity to overcome them, taking into account their embeddedness in various fields of practice, each with their own rationales and ruptures.
Increasing evidence supports the claim that stress changes play a fundamental role in triggering volcanic eruptions. Stress changes may vary in origin to include earthquakes, erosion and landslide processes, deglaciation, or tidal effects. The local stress can also change as response of magma influx from deeper reservoirs and an increase of the magma/gas pressure. The stress transfer may be of great importance in reawakening a dormant system. As an example, significant statistical correlation of large earthquakes and eruptions in time and space was suggested in many works. The interaction may be two-fold; where magma intrusions may change the stress at active faults and trigger earthquakes, ...
This open access book summarizes the findings of the VUELCO project, a multi-disciplinary and cross-boundary research funded by the European Commission's 7th framework program. It comprises four broad topics: 1. The global significance of volcanic unrest 2. Geophysical and geochemical fingerprints of unrest and precursory activity 3. Magma dynamics leading to unrest phenomena 4. Bridging the gap between science and decision-making Volcanic unrest is a complex multi-hazard phenomenon. The fact that unrest may, or may not lead to an imminent eruption contributes significant uncertainty to short-term volcanic hazard and risk assessment. Although it is reasonable to assume that all eruptions are...
Rock fractures play a major role in many geological processes, such as plate tectonics, earthquakes, volcanic eruptions and fluid transport in the earth’s crust. The present volume contains the abstracts of all presentations of the symposium „Rock Fractures in Geological Processes“, held on 26-27 November 2013 in London honouring the 60th birthday of Agust Gudmundsson, chair in Structural Geology, Royal Holloway University of London, a leading expert in the field and author of a well known text book of the same title. The symposium covered all topics related to fractures in the earth’s crust, e.g., crustal stresses, rock mechanical properties, field analysis of fractures – from joints and faults to mineral veins and dykes -, analytical, analogue and numerical models of fractures and related fluid transport, as well as the activity of faults and volcanoes including calderas, and economic aspects such as exploration and exploitation of hydrocarbons and geothermal energy.
'Exceedingly well-researched and packed with fascinating lore, it should appeal to avid birders and general readers alike' - WALL STREET JOURNAL 'As gleaming and mesmeric as its tiny subject' VANITY FAIR 'Ever thoughtful and engaging, Jon Dunn pursues these dazzling creatures through dust and jungle to the chillier shores at the far end of the world' - BENEDICT ALLEN 'Enticing ... brilliant ... a warm-hearted and enthusiastic triumph of nature writing' - TIM DEE _____________________ For centuries hummingbirds have captured our imaginations: revered by Native Americans, coveted by European collectors and admired worldwide for their jewel-like plumage, acrobatic flight and immense character. ...