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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 98 (1972), S. 235-240 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The probability of occurrences of thundery weather over Gauhati airport has been investigated. During the pre-monsoon thunderstorm period, the months of April and May have higher probabilities for the occurrences of thundery weather and the month of March has, on average, medium probabilities. The probability for thundery weather, during the months of March and April, is the highest during 〉18 to 24 h and then decreases successively during 00 to 06 h, 〉12 to 18 h and 〉06 to 12 h in order. The month of May, being the transition season for sharp decrease of nor' westers, is an exception. The months June to September, during monsoon season, have high probabilities for a day being thundery; but the month of October, during which monsoon virtually withdraws, shows decreasing trend in probabilities for successive date-groups. During the whole of the monsoon months, the time-groups 〉12 to 18 h, 〉18 to 24 h, 00 to 06 h and 〉06 to 12 h rank first, second, third and fourth in the order of probability for a day being thundery. In April and May, the probabilities for the occurrences of thundery weather of MLL, LL and VLL groups are higher, but in the month of March, the probabilities for the occurrences of first two groups are higher and the third group has medium probability. During the months June to September, in the monsoon season, the probability for thundery weather of MLL and LL groups are higher but that of VLL group has the medium probability; during the month of October — the last month for monsoon season — MLL and LL have higher and medium probabilities for the occurrences of thundery weather.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Cauchy theory of initial stress has been applied to investigate the problem of SH waves in an initialy stressed elastic plate. The initial stress is assumed to be a uniform tension or compression along the thickness of the plate. It is found that the initial stress influences the velocities of the dispersive modes only but, it has no influence on the velocity of the non-dispersive wave.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 99 (1972), S. 5-11 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Whereas observations of planets and solar satellites are more promising for detecting possible variations of Newtonian gravitational constant,G, with time the application of additional methods which are substantially different might be useful. It is discussed to what extent the tidal problems can be solved in connection with lunar orbit tracking for detectingG; further a relativeG-experiment at the earth surface is outlined.
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  • 5
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The effect of secular sea level variations on coastal levelling nets was considered for some parts of the North West European Lowlands levelling. On neglecting local geological influences a simplified global model was used for treating the following problems: (1) Magnitude of secular tilt effects in NWELL due to possible sea level variations; (2) Levelling errors due to sea tide loadings.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Experimental dispersion curves of short-period Love waves due to three small shocks in the Koyna region and recorded at Bombay have been compared with theoretical computed curves. The results indicate that the average thickness of the traps overlying the granitic basement is about 1.25 km.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1623-1637 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary From the Uppsala tripartite array,dT/dΔ and azimuth are determined for 181P and 24PKP phases. Near-surface lateral inhomogeneity is found from azimuth deviations to be small, equivalent to 〈3° dip on the Moho. Slowness, corrected for this structure, is divided into two azimuthal groups: from an ‘Asian’ group are indicated higherP velocities in the lower mantle and a lowerP-velocity gradient in the uppermost mantle, probably a low-velocity layer; the remainingdT/dΔ, from N, W and S azimuths, indicate a more normal velocity profile. There is evidence for a narrow zone of rapid transition between these two structural groups along the Arctic-Soviet continental margin. The few core phases indicate aBolt, rather than aJeffreys, type of core model.
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  • 8
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Using about 100 earthquakes recorded on both the short-period and long-period matched three-component seismograph systems at Umeå (UME) in northern Sweden, relativeP-wave travel times (LP-SP) are measured and arrival angles (incidence and azimuth) are determined from relative amplitudes ofP. Long-period onsets appear to register consistently later than short-period ones by a couple of tenths of a second. This figure is of the same order as the uncertainty in δT LS (difference between LP and SP onset times), but still is shown to be of some statistical significance. The effect is believed due, at least in part, to the relative inability of the long-period seismometer to visibly register an initial shorter-period lower-amplitude focal phase from some earthquakes. The dip on crustal interfaces implied by the short-period azimuth and incidence-angle anomalies is 7 to 15 times greater than that implied by the long-period anomalies. This effect is believed due to undulation or irregularity of, foremost, the Moho, as well as other crustal boundaries. The ‘wavelength’ of, say, Moho undulations would seem to be limited above and below by considerations of the dominant long-period wavelengths (∼100 km) and of the ‘diameter’ of Moho sampled by the short-period waves (∼50 km). The possible ‘undesirable’ effect of the crustal layering on the components of surface motion, and thus on the arrival angles, is discussed and cautiously dismissed, due to the absence of sedimentary layering, in favour of the above interpretation.
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  • 9
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The Uppsala seismograph array station (UPSAS) has been tested with respect to mutual resemblance of body-wave signals recorded by the individual array sensors. Records ofP-, pP- andPKP-phases from ten teleseismic earthquakes and the HANDLEY explosion, in the magnitude range fromm b =5.8 tom b =6.9, are investigated in detail. Calculated coherence and cross-correlation functions confirm that the area selected for UPSAS provides extremely favourable conditions for the operation of an array station. High signal similarity across UPSAS shows no obvious dependence upon the location of the focus or the magnitude. Natural and man-made events provide comparable results.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1672-1681 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Effects of non-homogeneity in respect of rigidity have been computed in the case of a gravitating sphere with a rigid core. For an isotropic spherical shell the effect of variation of rigidity has been calculated when the shell is under pressure or when the shell is subjected to some steady temperature on its internal surface.
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