???????????????? ??-?????? ( P-waves ) ????? ????????? ????? ????????? ???? , ????? , ????? ?????? ???? ????????? ???????? ??????, ???? ????????? ?????? ??????? ???????????????????. ??????????????? ????? ???????? ?????????????????? ??????? ???????? ???????. ?? ??????? ???? ???????? ??????? ?????? ????? ???????? ???? 'pressure' ???????? ??????????, ?????? ???? ????????? ????? ??????? ?????????? 'primary' ??????? ???????? ??????????? ?????????? ?????????? ^[1] .

??? ?????????? ???????????? ??-?????? ??????????? ????????? ?????? ?????????. ?????? ???????? ????????, ??????? ???? ???????? ???????? ?????????? ??????? ??????? ??????.

?????? [ ???? ]

?????? ?????????????, ??-???????? ???????? ?????????????? ????????:

${\displaystyle v_{p}={\sqrt {\frac {K+{\frac {4}{3}}\mu }{\rho }}}={\sqrt {\frac {\lambda +2\mu }{\rho }}}}$

??????? ???????????? K ?????? ???????????? (bulk modulus), ${\displaystyle \mu }$ ?????? ?????????????? (shear modulus), ${\displaystyle \rho }$ ?????? ??? ?????? ???????? ????????, ${\displaystyle \lambda }$ ?????? ??????? ????? ?????? (the first Lame parameter).

?????????????????? ???????? ???????? ??????????, ???? ????????? ???????????? K , μ ??????????????? ???????????? ?????????????????????????.

??-??? ?????????????? (elastic moduli P-wave modulus), ${\displaystyle M}$, ?????? ?????????????? ?????? ?????????????????, ${\displaystyle M=K+4\mu /3}$, ????

${\displaystyle v_{p}={\sqrt {M/\rho }}.\ }$

??????? ??????????? ??-??? ?????? 5 ????? 8 ??.??/???? ?????? ????????? ^[2] . ????????? ???????????? ????????? ???????? ?????? ?????????. ????????? ??????????????????? (????????? ?????? ???????????? ) 6 ??.??/???? ??????????? ?????????????????, ????? ???????? ???? ???? ?????????????? 13 ??.??/???? ??????? ?????????. ^[3]

??????????? ?????????? ???????? (Francis Birch) ??-???????? ???????????? ???????? ?????????????? ???????? ????????????????????????:

${\displaystyle V_{p}=a({\bar {M}})+b\rho }$.

??? ??????? ???????? ???? (Birch's law) ?? ????????????.

?????????????????? ????????????? [ ???? ]

1. ↑ Milsom, J. (2003). Field Geophysics . The geological field guide series. Vol. 25. John Wiley and Sons. p. 232. ??????????? ?????????? ???   978-0-470-84347-5 . ????????????? ???? 2010-02-25 .
2. ↑ "Speed of Sound through the Earth" . Hypertextbook.com . ????????????? ???? 2011-12-14 .
3. ↑ "Seismographs - Keeping Track of Earthquakes" . Earthquake.usgs.gov. 2009-10-27. Archived from the original on 2011-12-10 . ????????????? ???? 2011-12-14 .
4. ↑ "Acoustic Logging" . epa.gov. 2011-12-12 . ????????????? ???? 2015-02-03 .

• "Photo Glossary of Earthquakes" . U.S. Geological Survey" . Archived from the original on ???????? 27, 2009 . ????????????? ???? March 8, 2009 . {{ cite web }} : Check date values in: |archive-date= ( help )

??????????????? [ ???? ]

• Animation of a P-Wave
• P-Wave velocity calculator
• Purdue's catalog of animated illustrations of seismic waves ????????????? 2005-10-04 at the ??????? ?????????
• Animations illustrating simple wave propagation concepts by Jeffrey S. Barker ????????????? 2017-05-10 at the ??????? ?????????
• Detection of P-waves and Rejection of Environmental Noise for Accurate Earthquake Early Warning ????????????? 2008-08-21 at the ??????? ?????????