Geoscience Reference
In-Depth Information
Appendix 8
The IASP91 Earth Model
Depth
z
(km)
Radius
r
(km)
P-wave velocity
α
(km s
−1
)
S-wave velocity
β
(km s
−1
)
5153.9-6371
0-1217.1
11.240 94 - 4.096 89
x
2
3.564 54 - 3.452 41
x
2
2889-5153.9
1217.1-3482
10.039 04
+
3.756 65
x
- 13.670 46
x
2
0
2740-2889
3482-3631
14.494 70 - 1.470 89
x
8.166 16 - 1.582 06
x
760-2740
3631-5611
25.1486 - 41.1538
x
+
51.9932
x
2
- 26.6083
x
3
12.9303 - 21.2590
x
+
27.8988
x
2
- 14.1080
x
3
660-760
5611-5711
25.969 84 - 16.934 12
x
20.768 90 - 16.531 47
x
410-660
5711-5961
29.388 96 - 21.406 56
x
17.707 32 - 13.506 52
x
210-410
5691-6161
30.787 65 - 23.254 15
x
15.242 13 - 11.085 52
x
120-210
6161-6251
25.413 89 - 17.697 22
x
5.750 20 - 1.274 20
x
35-120
6251-6336
8.785 41 - 0.749 53
x
6.706 231 - 2.248 585
x
20-35
6336-6351
6.50
3.75
0-20
6351-6371
5.80
3.36
Note
: The variable
x
6371 is the normalized radius.
Source
: From Kennett, B. L. N., Engdahl, E. R. and Buland, R. 1995. Constraints on seismic
velocities in the Earth from travel times.
Geophys. J. Int
.,
105
, 429-65.
=
r
/
650
