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Preface to the Second Edition

It is just over ten years since the first edition of The Earth‘s Core was published It has been said that the typical doubling period for the accumulation of scientific knowledge during the last two centuries is about fifteen years, and this is certainly the case for the Earth’s core. The second edition has been largely rewritten and expanded, but follows the same layout as the first edition.

The first chapter on the general physical properties of the Earth now includes a long section on the core-mantle boundary (the so-called D” layer). The section on free oscillations of the Earth is extended and a section on attenuation (the Q of the Earth) added.

In Chapter 2, the accretion mechanism is treated in much more detail and the sections on heat sources in the early Earth and the time of core formation more thoroughly discussed.

Chapter 3 now contains a section on Griineisen’s parameter and its role in the thermal regime of the Earth. Melting-point depth curves are discussed in more detail in the light of more recent highpressure shock wave data and a new section is added on the thermal consequences of an iron-alloy core.

In Chapter 4 the section on reversals of the Earth’s magnetic field is greatly expanded and the sections on the energetics of the Earth’s core and on variations in the length of the day largely rewritten. A new section on the secular variation is added.

Chapter 5 has been considerably modified. I t now contains a more detailed discussion of equations of state and a new section on experimental methods (both static and dynamic). The constitution of the Earth’s core is reviewed in more detail and the case for the presence of silicon, sulphur, oxygen and potassium in the core assessed.

Chapter 6 is essentially rewritten. It contains much more information on the cores of the Moon and

other planets-mainly as a result of increased data from space probes and more detailed numerical modelling. In general SI units have been used. However, in some cases where the older system seems to persist in much of the literature, their usage has been retained, e.g. densities are expressed in g/cm3 rather than in kg/m3. This also has the advantage that their magnitude is reduced by a factor of three. Again the ST unit of pressure is the pascal (Pa), but much experimental work at high pressures still quotes results in kilobars (kb). The conversion is 1 giga pascal (GPa) = 10 k bar. Pressures in the Earth’s core exceed 100 GPa = 1 M bar.

J. A. JACOBS

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