U. Fano's Atomic collisions and spectra PDF

By U. Fano

ISBN-10: 0122484606

ISBN-13: 9780122484605

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The map also shows the location of the UK designed arrays (triangles): EKA, Eskdalemuir, Scotland; GBA, Gauribidanur, India; WRA, Warramunga, Australia; and YKA, Yellowknife, Canada. The three overseas array stations were established as joint projects with the host countries. group was putting up a smoke screen. Although all results published had to be cleared by the MoD, permission to publish was never withheld from any paper. It might be thought that the development of forensic seismology would have been principally the application of the techniques of traditional earthquake seismology to the interpretation of the seismic waves from explosions.

5. For a layered half-space the variation in amplitude with depth has the same general form, with amplitude decaying more rapidly with depth at high frequencies than at low frequencies. A consequence of this is that at high frequencies and short wavelengths the bulk of the motion is in the topmost layers and it is the P- and S-wave speeds (α and β) and densities (ρ) in these layers that largely determine the Rayleigh wave speed. At long periods where a large proportion of the energy in the wave is travelling below the surface layers the speed is determined principally by the values of α, β and ρ at depth.

The continuous background of seismic noise has little effect on observations of the waves from large earthquakes as their amplitude is much greater than that of the noise. If seismology is to provide an effective way of detecting (and ideally identifying) explosions, the recording systems in use in the 1950s were inadequate for the detection of the weak signals from tests of a few kilotons (ground motions in the 30–90◦ range of around 10 nm at 1 Hz). Many of the seismometers did not have the required sensitivity, and responded to unwanted non-seismic disturbances such as changes of air temperature and atmospheric pressure; seismometers that had the required sensitivity were heavy and bulky and so were unsuitable for deployment as arrays.

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Atomic collisions and spectra by U. Fano

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