scholarly journals INVESTIGATIONS INTO VERTICAL TRAVEL TIME OF THE FRONT OF BUOYANT FIRE PLUMES

1997 ◽  
Vol 62 (502) ◽  
pp. 1-8 ◽  
Author(s):  
Takashi FUJITA ◽  
Jun-ichi YAMAGUCHI ◽  
Takeyoshi TANAKA ◽  
Takao WAKAMATSU
Keyword(s):  
Travel Time ◽  
Fire Plumes ◽  
Vertical Travel

A VELOCITY FUNCTION INCLUDING LITHOLOGIC VARIATION

Geophysics ◽  
1953 ◽  
Vol 18 (2) ◽  
pp. 271-288 ◽  
Author(s):  
L. Y. Faust
Keyword(s):  
Travel Time ◽  
Direct Measurement ◽  
General Knowledge ◽  
Velocity Function ◽  
Geologic Time ◽  
True Resistivity ◽  
Resistivity Log ◽  
Vertical Travel ◽  
Water Resistivity

Assuming velocity (V) a function of depth (Z), geologic time (T), and lithology (L) the resistivity log is an approach to the determination of L. Since general knowledge of water resistivity values [Formula: see text] is lacking, the values of true resistivity [Formula: see text] against [Formula: see text] were compared for 670,000 feet of section widely distributed geographically. Variations in [Formula: see text] were presumably averaged out thereby, and the results indicate that statistically [Formula: see text] and [Formula: see text] This formula was applied to an additional 270,000 feet of section more localized geographically to observe its accuracy in predicting vertical travel time. If a correction map for [Formula: see text] variations is applied the results are encouraging but less accurate than good velocity surveys. Examination of an inconclusively small amount of data with more careful measurements of [Formula: see text] suggests that accuracy comparable to direct measurement may be attainable. The cooperation of other investigators and of the electric‐logging specialists is desired.

Asymptotic behavior of vertical travel-time sensitivity kernels with increasing propagation range

2011 ◽  
Vol 130 (4) ◽  
pp. 2392-2392
Author(s):  
E. K. Skarsoulis ◽  
B. D. Cornuelle ◽  
M. A. Dzieciuch
Keyword(s):  
Asymptotic Behavior ◽  
Travel Time ◽  
Time Sensitivity ◽  
Vertical Travel

Long-range asymptotic behavior of vertical travel-time sensitivity kernels

2013 ◽  
Vol 134 (4) ◽  
pp. 3201-3210 ◽  
Author(s):  
E. K. Skarsoulis ◽  
B. D. Cornuelle ◽  
M. A. Dzieciuch
Keyword(s):  
Asymptotic Behavior ◽  
Travel Time ◽  
Long Range ◽  
Time Sensitivity ◽  
Vertical Travel

VELOCITY FUNCTIONS IN SEISMIC PROSPECTING

Geophysics ◽  
1953 ◽  
Vol 18 (2) ◽  
pp. 289-297 ◽  
Author(s):  
H. Kaufman
Keyword(s):  
Travel Time ◽  
Average Velocity ◽  
Time Function ◽  
Instantaneous Velocity ◽  
Geophysical Prospecting ◽  
Velocity Function ◽  
Mathematical Properties ◽  
Basic Equations ◽  
Vertical Travel ◽  
Quantities Of Interest

An account of the mathematical properties of velocity functions used in the seismic method of geophysical prospecting is presented. Basic equations are given for deriving various quantities of interest associated with a particular velocity function, such as average velocity as a function of depth, average velocity as a function of vertical travel time, parametric equations for displacement, depth, travel time, etc. In Part I the relations are based on a given instantaneous‐velocity—depth function. Part II contains a similar analysis based on a given instantaneous‐velocity—vertical‐time function. The results are incorporated in Tables I and II.

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