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Compressional to shear velocity ratio (VPVS)
This is the name of a log measured along a well bore (a well-log). You could have found the code VPVS in your log evaluation software or your corporate datastores. The official name for this log is 'Compressional to shear velocity ratio'. The usage of this log is well established. The values of this log represent the ratio of velocity of Shear wave (Vs) to that of Compressional wave (Vp).This log in unitless. Either the log measurements can not be expressed with a unit (eg. a ratio) or the unit is unknown to us.
Data for this log is produced by a tool that uses a acoustic logging technique and can be used to investigate the velocity of the formation. Similar logs are listed below: