Ali [email protected] of Earth
SciencesKFUPMGravity and IsostasyIntroduction to
GeophysicsIntroduction to Geophysics-KFUPMPrevious LectureGravity
UnitsExample 1: Marss t!in moons Example ": $he %alley and
&id'e Province (1-) m'als* +ensitivity: ,ensity
,istri-ution+ensitive to chan'es in Mass (,ensity* chan'es
,ensities o. Geolo'ical Materials /n-Line Gravity Map 0onstruction
$ool0olor ta-le .or standard Gravity map Example 1: 1orth 2natolian
Fault 3one in the sea o. Marmara Example ": Gha!ar re'ion o. +audi
2ra-ia Introduction to Geophysics-KFUPMParks and Plates,pp.272005
Robert J. Lillie Introduction to Geophysics-KFUPMParks and
Plates2005 Robert J. LillieParks and Plates2005 Robert J. Lillie
Introduction to
Geophysics-KFUPMhttp://www.moorlandschool.co.uk/earth/tectonic.htmIntroduction
to Geophysics-KFUPM1977, Marie ThorpeParks and Plates2005 Robert J.
Lillie$opo'raphy o. the /cean FloorIntroduction to
Geophysics-KFUPMNational
erona!ti"s and #pa"e
d$inistration $!o Forms o. Isostatic Upli.tpp.2% Parks and
Plates 2005 Robert J. LillieIntroduction to Geophysics-KFUPMLow
density due to higher
temperaturehttp://www.moorlandschool.co.uk/earth/tectonic.htm$!o
Forms o. Isostatic Upli.tIntroduction to Geophysics-KFUPM4hat is
Isostatic E5uili-rium6 7 0rust .loats on Mantle (hydrodynamic
e5uili-rium*7 +ur.ace elevation is .unction o. underlyin' mass
(thic8ness and density o. crust*7 +ur.ace elevation is compensated
-y mass -elo! itIntroduction to Geophysics-KFUPM9ou'uer
2nomaly7+li'htly positive over oceans7+li'htly ne'ative over
continents4hy67 9ecause a uni.orm density !as used in
InternationalGravity Formula":;< '=cm>>:>
'=cm>Mantlehttp://www.moorlandschool.co.uk/earth/tectonic.htmIntroduction
to Geophysics-KFUPMExample .rom 2ra-iaAB0
!A BDistance (km)Depth (km)0500 1000 15002000Bouguer
GraviyMgal0500 1000 150020001000-100Introduction to
Geophysics-KFUPMExample .rom 2ra-iaAB0
!ABDistance (km)Depth (km)0500 1000 15002000,ata +ource: 0ornell
University7 9ou'uer anomalies that are ne'ative over hi'h areas and
positive over oceans:71ear sea level? the avera'e is close to
@ero:7 $he ne'ative 9ou'uer anomalies areas due to the excess o.
lo! density material at depth in mountainous re'ions !hen compared
to roc8s at depth in areas o. lo! relie. near sea
level:Introduction to Geophysics-KFUPMHomework, Due to May 17Use
the online tool .or ma8in' a 'ravity map .rom the site
http:==!!!:itismolinari:mi:it=Gravity:htm:Ma8e your 'ravity map and
compare chan'es in the 'ravity to chan'es throu'h re'ions o. maAor
tectonics64hat is the 'ravity throu'h the areas: a* &ed +ea -*
,ead +ea Fault c* Iranian +ea d* Gul. o. 25a-a e* 3a'ros $hrust
FoldIntroduction to Geophysics-KFUPM$he 5ui@ o. the !ee8For the
.ollo!in' e5uation? de.ine the varia-les:F22B 'o-s C 'th DF2092 B
F22 C 90 D $0Introduction to Geophysics-KFUPM