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Volcanoes. Global Perspectives

  • ID: 2177055
  • Book
  • Region: Global
  • 550 Pages
  • John Wiley and Sons Ltd
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Volcanoes are essential elements in the delicate global balance of elemental forces that govern both the dynamic evolution of the Earth and the nature of Life itself. Without volcanic activity, life as we know it would not exist on our planet. Although beautiful to behold, volcanoes are also potentially destructive, and understanding their nature is critical to prevent major loss of life in the future.

Richly illustrated with over 300 original color photographs and diagrams the book is written in an informal manner, with minimum use of jargon, and relies heavily on first–person, eye–witness accounts of eruptive activity at both "red" (effusive) and "grey" (explosive) volcanoes to illustrate the full spectrum of volcanic processes and their products. Decades of teaching in university classrooms and fieldwork on active volcanoes throughout the world have provided the authors with unique experiences that they have distilled into a highly readable textbook of lasting value. Questions for Thought, Study, and Discussion, Suggestions for Further Reading, and a comprehensive list of source references make this work a major resource for further study of volcanology.

Volcanoes maintains three core foci:

  • Global perspectives explain volcanoes in terms of their tectonic positions on Earth and their roles in earth history
  • Environmental perspectives describe the essential role of volcanism in the moderation of terrestrial climate and atmosphere
  • Humanitarian perspectives discuss the major influences of volcanoes on human societies. This latter is especially important as resource scarcities and environmental issues loom over our world, and as increasing numbers of people are threatened by volcanic hazards


Volcanologists, advanced undergraduate, and graduate students in earth science and related degree courses, and volcano enthusiasts worldwide.

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1. Eruptions, Jargon, and History 5

A Grey Volcano in Eruption Galunggung 1982 6

A Red Volcano in Eruption Kilauea 1974 16

Some Basic Terminology 22

History of Volcanology 27

Further Reading 39

Questions for Thought, Study, and Discussion 40


2. Global Perspectives Plate Tectonics and Volcanism 45

Birth of a Theory 45

Volcanoes along Divergent Plate Boundaries 51

Volcanoes along Convergent Plate Boundaries 53

Intraplate Volcanoes 60

Further Reading 63

Questions for Thought, Study, and Discussion 64

3. The Nature of Magma Where Volcanoes Come From 65

Origins of Magma 65

The Physics and Chemistry of Melting 68

Classification of Magma and Igneous Rocks 72

Principal Magma Types 73

Magmatic and Volcanic Gases 78

Further Reading 86

Questions for Thought, Study, and Discussion 87

4. The Physical Properties of Magma and Why it Erupts 89

Magma Temperatures 89

Magma Rheology 91

Magma Ascent and Emplacement 94

Frozen Magma Subvolcanic Intrusives 100

Triggers for Volcanic Eruptions Why Volcanoes Erupt 105

Repose Intervals 108

Further Reading 109

Questions for Thought, Study, and Discussion 110


5. Classifying Volcanic Eruptions 115

Lacroix Classification System 117

Rittman Diagrams 118

Geze Classification Diagram 119

Walker Classification System 119

Volcanic Explosivity Index (VEI) 123

Further Reading 125

Questions for Thought, Study, and Discussion 126

6. Effusive Volcanic Eruptions and Their Products 127

Mafic and Intermediate Effusive Eruptions 128

Pahoehoe and 0A0a 135

Pyroducts 138

Pahoehoe Surface Structures 147

Lava Flow Internal Structures 157

0A0a Surface Structures 162

Block Lavas 166

Radiocarbon Dating of Prehistoric Lava Flows 170

Further Reading 171

Questions for Thought, Study, and Discussion 172

7. An Overview of Explosive Eruptions and Their Products 173

Ejecta Classification 174

Explosive Eruption Styles and Their Products 188

Pyroclastic Density Currents (PDCs) 204

Further Reading 220

Questions for Thought, Study, and Discussion 221

8. A Closer Look at Large–scale Explosive Eruptions 223

Measuring the Sizes of Plinian Eruptions 224

Plinian Eruption Dynamics 224

Pyroclastic Density Currents (PDCs) 235

Directed Blasts 255

Super–Eruptions 258

Further Reading 261

Questions for Thought, Study, and Discussion 262


9. Constructional ( Positive ) Volcanic Landforms 267

Large Igneous Provinces 267

Shield Volcanoes 270

Composite Volcanoes 283

Minor Volcanic Landforms 290

Volcano Old Age and Extinction 308

Further Reading 314

Questions for Thought, Study, and Discussion 315

10. Negative Volcanic Landforms Craters and Calderas 317

Small Craters 318

Calderas 321

Post–caldera Resurgence 331

Caldera Formation Mechanisms 335

Caldera Roots Relationships to Plutonic Rocks 336

Volcano–tectonic Depressions 336

Further Reading 338

Questions for Thought, Study, and Discussion 339

11. Mass–wasting Processes and Products 341

Landslides, Avalanches, and Sector Collapses 341

Lahars 347

Causes of Lahars 350

Lahar Dynamics 354

Lahar Destructiveness 356

Further Reading 358

Questions for Thought, Study, and Discussion 359

12. Volcanoes Unseen and Far Away 361

Submarine and Subglacial Volcanoes The Meeting of Fire, Water, and Ice 362

Extraterrestrial Volcanoes 377

Further Reading 392

Questions for Thought, Study, and Discussion 393


13. Volcanoes: Life, Climate, and Human History 397

Volcanoes and the Origin of Life 397

Volcanoes, Atmosphere, and Climate 398

Volcanic Influence on Soil Fertility and Agriculture 406

Volcanoes and Human History 407

Social Impact of Volcanic Eruptions 408

Further Reading 411

Questions for Thought, Study, and Discussion 412

14. Volcanic Hazards and Risk Monitoring and Mitigation 413

Hazards and Risk 414

Active, Dormant, and Extinct Volcanoes 414

Volcanic Hazards 416

Volcanic Risk 425

Volcano Monitoring 443

Volcanic Crisis Management 455

Further Reading 462

Questions for Thought, Study, and Discussion 463

15. Economic Volcanology 465

Earth Energy Relationships 465

Volcano Energy 466

Stored Energy: Geothermal Power 467

Volcanoes and Ore Deposits 470

Other Useful Volcanic Materials 475

Further Reading 477

Questions for Thought, Study, and Discussion 478

Epilogue: The Future of Volcanology 479

References 481

Index 521

Appendix: List of Prominent World Volcanoes 538

Map: Prominent World Volcanoes 540

Companion website available at <a href="[external URL]
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John P. Lockwood
Richard W. Hazlett
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