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Add to Wishlist. Our planet can be violent and destructive. Volcanoes erupt, sending out clouds of ash and rivers of molten lava. Earthquakes shake up the land, destroying buildings and sparking destructive fires. Tsunamis—enormous ocean waves—crash onto the shore, devastating coastal communities. This fascinating guide to natural disasters combines fact-packed, easy-to-read text with colorful and quirky illustrations.

From earthquakes to volcanoes, it is an eye-opening introduction to the devastating and often terrifying power of the natural world and how science can be used to predict disasters and help prevent loss of life. Full-color cartoon-style illustrations that make the books fun and attractive to reluctant readers Fascinating Facts offer additional chunks of bite-sized information Can You Believe It? Early Literacy. Board Books. Math Counts. Rookie Amazing America.

The Wonder Book of Volcanoes and Earthquakes by Edwin J. Houston - Free Ebook

Rookie Biographies. Rookie National Parks. Rookie Nursery Rhymes. Rookie Poetry. Rookie Preschool. Rookie Read-About. Rookie Read Aloud. Rookie Ready to Learn. Rookie Talk About It. Scholastic News Nonfiction Readers. Side By Side. A further important step to test our model would be a comparison with a moment—tensor inversion of low-frequency volcanic earthquakes Legrand et al. This could give further insights into the source mechanism, geometry and its position and orientation.

Fruitful discussions with S. Sturton, L. Collier and B. Baptie BGS are fully acknowledged. Stig Hestholm kindly helped tracking bugs in our code. Geoff Wadge provided the DEM used for our finite difference with topography. Oxford University Press is a department of the University of Oxford. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide.

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Advanced Search. Article Navigation. Close mobile search navigation Article Navigation. Volume Article Contents. Modelling low-frequency volcanic earthquakes in a viscoelastic medium with topography Philippe Jousset. Oxford Academic. Google Scholar. Arthur Jolly. Article history. Cite Citation.

The Wonder Book of Volcanoes and Earthquakes by Edwin J. Houston - Free Ebook

Permissions Icon Permissions. Summary Magma properties are fundamental to explain the volcanic eruption style as well as the generation and propagation of seismic waves. View large Download slide. The theory of linear viscoelasticity is based on Boltzmann's superposition principle and is only valid for small changes in the stress and strain Barnes et al.

The general differential equation for 1-D linear viscoelasticity Oldroyd is:. Two important viscoelastic bodies are the Kelvin—Voigt model a spring and a dashpot in parallel and the Maxwell model a spring and a dashpot in series Barnes et al. The Fourier transform of eq.

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In 1-D, it is governed by. One relaxation mechanism is usually not sufficient to reproduce the rheological behaviour of materials and consequently the introduction of several mechanisms in series or in parallel has been proposed Barnes et al. For an array of L SLS, the stress relaxation function. From here, it is possible to get any Q dependence with frequency, by adjusting the stress relaxation times distribution of the L relaxation mechanisms, as needed.

Attenuation is generally frequency-dependent Aki ; Bourbie et al. McDonal et al. For a sufficiently well chosen repartition of stress relaxation times and a desired frequency band, eq.

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We use this approach in our modelling. Note that, in the case of a homogeneous and isotropic medium, we can define two independent quality factors Q P and Q S from eq. Finally, we give the order of magnitude of the quality factor given by SLS models for properties corresponding to various magmas. Experimental studies on pyroclastic and lava samples Vanorio et al. For one SLS mechanism Fig.

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The incorporation of surface topography is achieved by using a linear mapping transformation Fig. The 2-D mapping function can be written as. The equations of motion for the P - SV wave equation are. We proceed now to the derivation of the constitutive relationship, using the SLS as a rheological model. The tensor formulation of linear viscoelasticity eq. The constitutive relationship simplifies to Christensen In eq. At the free surface, the traction vector T vanishes, i.

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When constant- Q absorption operates, the amplitude spectrum of a seismic pulse at frequency f obeys White :. In order to understand how the amplitudes decay in our synthetic seismograms as the result of geometrical spreading and attenuation in the conduit, we measure peak-to-peak amplitudes of the successive wavelets in the coda, for various values of Q in the conduit length m , the surrounding medium being elastic Figs 8 and 9. We compare these synthetic amplitudes with theoretical amplitudes, obtained using amplitude decay resulting from 2-D geometrical spreading, reflection and transmission at the top and the bottom of the conduit, and intrinsic attenuation of waves travelling in the conduit.

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  8. As we have 2-D seismograms, interface waves propagate along the conduit without loosing energy. Attenuation of shear-waves in the lithosphere for frequencies from 0. Search ADS. In southern Alaska, which has in places lost a vertical kilometre of ice cover, the reduced load on the crust is already increasing the level of seismic activity.

    Does this all mean that we are in for a more geologically active future as well as a hotter and meteorologically more violent one? Well, no one is suggesting that we will see a great surge in the number of earthquakes and volcanic eruptions. As always, these will be controlled largely by local geological conditions. Where an earthquake fault or volcano is primed and ready to go, however, climate change may provide that extra helping hand that brings forward the timing of a quake or eruption that would eventually have happened anyway. As the world continues to heat up, any geological response is likely to be most obvious where climate change is driving the biggest environmental changes — for example, in areas where ice and permafrost are vanishing fast, or in coastal regions where rising sea levels will play an increasing role.

    Freysteinn Sigmundsson of the Nordic Volcanological Centre observes that the centre of Iceland is now rising by more than three centimetres a year in response to shrinking glaciers. Studies undertaken by Sigmundsson and his colleagues forecast that the reduced pressures that result will lead to the formation of significant volumes of new magma deep under Iceland.

    As well as encouraging magma to rise to the surface, leading to increased volcanic activity, removal of ice can also destabilise steep volcano flanks, making hazardous landslides more likely. The potential for more landslides is also likely to be a problem in high mountain ranges as the ice cover that stabilises rock faces vanishes. GPS measurements show that, like Scandinavia at the end of the last ice age, Greenland and the whole of the surrounding region is already rising in response to the removal of this ice load. More earthquakes in Greenland might not seem like a big deal, but this could have far wider ramifications.

    About 8, years ago, an earthquake linked to the uplift of Scandinavia, triggered the Storegga Slide; a gigantic undersea sediment slide that sent a tsunami racing across the North Atlantic. Run-up heights were more than 20m in the Shetlands and six metres along the east coast of Scotland, and the event has been blamed for the flooding of Doggerland; the inhabited Mesolithic landmass that occupied what is now the southern North Sea.

    The submerged margins of Greenland are currently not very well mapped, so the likelihood of a future earthquake triggering a landslide capable of generating a major tsunami in the North Atlantic is unknown.

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    Dave Tappin, a tsunami expert at the British Geological Survey, points out that one large, undersea landslide has been identified off the coast of Greenland, but suspects that there may not be sufficient sediment to generate landslides as large as Storegga. Nonetheless, the seismic revival of Greenland is certainly a geological response to climate change that we need to keep an eye on. The bottom line in all of this is that as climate change tightens its grip, we should certainly contemplate more and bigger Hurricane Matthews. However, when it comes to the manifold hazardous by-blows of an overheating planet, and especially those involving the ground we stand on, we must also be prepared to expect the unexpected.

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