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Slowness (seismology)

If we divide the path followed by the ray into N segments numbered i = 1, 2 .. N the total travel time of the waveis

${\displaystyle \Gamma =\sum _{i=1}^{N}s_{i}\Delta x_{i}}$

Therefore, the residual travel time is due to departures in slowness experienced by the wave along the raypath.

Sonic well logs[edit]

Measurements of interval transit time, designated ${\displaystyle {\Delta }t}$, made during wireline logging are used to determine sonic velocities of the wallrock in boreholes. The tool used has sources and receivers that are in contact with the wellbore and it measures the delay between the source being triggered and the signal being received. The measurements are normally in the units of microseconds per foot and are recorded on the well log.^[1]

References[edit]

External links[edit]

• Ram, A.; Yadav, L. (1984), "Structural corrections for slowness and azimuth of seismic signals arriving at Gauribidanur array", Bulletin of the Seismological Society of America, 74 (1), Seismological Society of America: 97–105, Bibcode:1984BuSSA..74...97R, doi:10.1785/BSSA0740010097
• Stein, S.; Wysession, M. (1991). An Introduction to Seismology, Earthquakes, and Earth Structure. Wiley. ISBN 978-0-86542-078-6.

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