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  • 1
    Publication Date: 1977-05-01
    Description: Using simulated data, it is demonstrated that one may estimate the body wave velocity in the crust by measuring the angle of incidence of P -waves provided only the very first part of the signal is used. This angle has been measured for a set of P -waves at the NORSAR long period instrument sites. Combining these observations with measurements of apparent velocities, we find that the data indicates a crust velocity of 6.1±0.4 km/sec. While it is somewhat uncertain to what depth the value is representative, the observations are in obvious disagreement with previous authors who concluded that long period P -waves were not affected by the earth's crust. Because of difficulties in separating the effects of real velocity variations from measurement errors, the details of the observed P -wave variation across the array are difficult to interpret. The consistent behavior of the data does, however, indicate that variations of approximately 3% must exist in the crustal P -wave velocity across the array. ©1977 Birkhäuser Verlag
    Print ISSN: 0033-4553
    Electronic ISSN: 1420-9136
    Topics: Geosciences , Physics
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