Page 297 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

279 have region (Figs. 8.20 and den- km; crustal of range the to compensate a on plot root; crustal free air anomaly; range are shown to due anomaly crustal thick to due anomaly for anomaly

Exercises How the might mode}? g/cnF g/cné 3.30 g/cré equilibrium isostatic relief of 2 thickness outside needed Moho depth and calculate 8.30), to due anomaly air level:iii) sea of a mountain to air free km 8 to due anomaly of lithosphere/asthenosphere depth free to air air free iv) boundary;

the model. the in Relief 2.67 3.26 Airy in wide; topographic gm/cm*; crustal (Fig. free to mass above model contribution i) free air the change in contribution iii) model.
of structure depicted Topo Moho Relief ? range km the change in approximations contribution due to simplified model: to isostatic equilibrium. model: for entire
interpretation km 1 km 1 Lithosphere Asthenosphere mountain 500 over is density of 3.3 of compensation. model the slab i) air anomaly highly a for the above contribution the model achieve the above lithosphere/asthenosphere Bouguer anomaly

geological lithosphere the | Crust Mantle of a diagram range the mantle depth show on semi-infinite model: the free to thicknesses sketch ii) level; on sketch to sketch of depth

a to Sea block of 2.8 gm/cm*; and topography. above contribution Bouguer anomaly. and mass above sea and boundary needed and in model]; v)
Discuss evolved uly OF SIBJ@WOPY OOL a 8.36), assuming: km; 60 km Calculate the Assuming graph ii) iv) Densities and page 280. Calculate root. Calculate Calculate change entire

+200
d) Draw sity 35 a) b) on a) b) c)
8-8

Ae

hypoth- why because including crust the is flat, the of to necessary basalt- change shown due shal- the air anomaly due air free

or Pratt explains that crust answer. and deep basin that than the by the by are anomaly air to due lithosphere/astheno- iv)

the Airy textbook crust. continental your km outside of the higher depth made caused g/cr) continental rift free the anomaly free the boundary; madel.

to than Discuss 5 is and is Moho in gravity gravity (2.9 2.7 g/crré a of : to air of the to entire
is closer geology of continental readily crust.” basin at g/cm*) (2.9 change to to profile. profile. : Basalt model contribution free the depth in isostatic equilibrium. contribution lithosphere/asthenosphere for

situation introductory top the more below. The topography both density g/cm’. 3.3 the contribution contribution anomaly anomaly simplified i) to change the iii) Bouguer anomaly

actual an than subducts continental shown basalt is model the for the for gravity highly model: contribution model achieve model:
the for lower than support. is The the density the on profile profile air Bouguer gravity a the level; ii) crust. the to the the of
Isostasy that statement is crust crust dense as basin is 40 km thick. that mantie equilibrium. the the free the the for above the thin on above depth model: v)

and suggest “Oceanic more computations basalt filled Note level. illustrate plot plot plot plot thicknesses page. sketch mass above sea sketch sketch in for entire
Gravity mode! Explain. concise top of oceanic False: is crust and a of basin sea g/cm’). The and isostatic and basin. and Moho depth. and and and following and low manile beneath and sphere boundary needed and change

refined Write.a or the at (2.7 Compute achieve Compute filled Compute Compute Compute Calculate the Calculate Calculate the anomaly
8 esis? the True oceanic sketches model outside exactly crust = ~ in Densities the on a) to c) to
Chapter d) 8-5 A 8-6 a) b ¢ ad) e) +50 8-7 b)

278