SEPS19-05PlateBoundaries.key1. 2. 3. 4. 5. 6. 7.
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6

7
Mid-Ocean Ridge


2
8
(Faulting and Magmatism at Mid-Ocean Ridges, Ed. Back et al., 1998)

13

14

(Pinet, Invitation to Oceanography 3rd Ed., 2006)
17
Subduction zone arc-trench system
Collision zone
North America Plate
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Ta =1300[°C]
k = 3.3*10 $5
T3.5 =1300* 3.5 /90 = 50.6[°C]
"3.5 = 2700 # (1$ 3.3*10$5 * (50.6 $ 0)) = 2695[kg /m 3 ]
T48.5 =1300* 48.5 /90 = 701[°C]
"48.5 = 3300 # (1$ 3.3*10$5 * (701$1300)) = 3365[kg /m 3 ]
"plate = ("3.5 * 7 + "48.5 *83) /90 = 3313[kg /m 3 ] > "

Ta =1300[°C]
k = 3.3*10 $5
T3.5 =1300* 3.5 /90 = 50.6[°C]
"3.5 = 2700 # (1$ 3.3*10$5 * (50.6 $ 0)) = 2695[kg /m 3 ]
T48.5 =1300* 48.5 /90 = 701[°C]
!
Ta =1300[°C]
k = 3.3*10 $5
T3.5 =1300* 3.5 /90 = 50.6[°C]
"3.5 = 2700 # (1$ 3.3*10$5 * (50.6 $ 0)) = 2695[kg /m 3 ]
T48.5 =1300* 48.5 /90 = 701[°C]
!
Ta =1300[°C]
k = 3.3*10 $5
T3.5 =1300* 3.5 /90 = 50.6[°C]
"3.5 = 2700 # (1$ 3.3*10$5 * (50.6 $ 0)) = 2695[kg /m 3 ]
T48.5 =1300* 48.5 /90 = 701[°C]
"48.5 = 3300 # (1$ 3.3*10$5 * (701$1300)) = 3365[kg /m 3 ]
"plate = ("3.5 * 7 + "48.5 *83) /90 = 3313[kg /m 3 ] > "
a


α
α
23
overriding plate subducted plate down going plate
outer rise
Uyeda Kanamori

31



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