2-D Niblett-Bostick magnetotelluric inversion - MTNet
2-D Niblett-Bostick magnetotelluric inversion - MTNet
2-D Niblett-Bostick magnetotelluric inversion - MTNet
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J. RODRÍGUEZ et al.<br />
Geologica Acta, 8(1), 15-30 (2010)<br />
DOI: 10.1344/105.000001513<br />
2-D <strong>Niblett</strong>-<strong>Bostick</strong><br />
28<br />
oriented in the i direction. On the other hand, the horizontal<br />
magnetic field satisfies the following differential equation<br />
(A.16 )<br />
The solution of this equation for a homogeneous half-<br />
space is simply<br />
(A.17)<br />
Therefore, the horizontal electric field is given by<br />
(A.18)<br />
Since E for TM mode is (Ex,0,Ez) and for a homogeneous<br />
half-space Ez is zero, we only need g 11 to compute δEx. The<br />
expression for g 11 is given in Lee and Morrison (1980).<br />
(A.19)<br />
Combining equations (A14), (A15), (A18), and (A19),<br />
we find the Fréchet derivative for TM mode:<br />
(A.20)<br />
2 Integral of Fréchet derivatives for TE and TM<br />
modes<br />
Here we find the integral of the Fréchet derivatives for<br />
a typical cell. For TE mode we integrate equation (A11) in<br />
the region xi≤x’≤xi+1, zj≤z’≤zj+1. That is<br />
(B.1)<br />
The result is<br />
(B.2)<br />
For TM mode we integrate equation (A20) in the same<br />
region, the result is<br />
(B.3)<br />
The integrals ITE and ITM as defined by Eqs. (B2) and (B3)<br />
are complex numbers. However, the real part of each one<br />
represents the corresponding integral of the Fréchet derivate<br />
of usau. The horizontal axis is divided into n elements, from<br />
x1 to xm, and the vertical distance is divided into m elements,<br />
from z1 to xm, then Eqs. (B2) and (B3) can be used to find the<br />
integral of the Fréchet derivative in the rectangular region<br />
defined by [xi, xi+1], and [zi, zi+1]. To take into account the<br />
whole half-space we have to consider (-∞, x1] and [xn, +∞)<br />
in the horizontal coordinate and [zm, +∞) in the vertical<br />
coordinate. The first case can be computed by noting<br />
that the corresponding sine transform for the argument<br />
x-b with b→±∞ is zero. The second case can be easily<br />
computed, considering that the corresponding exponential<br />
in equations (B2) or (B3) is null. In all cases, the actual<br />
computations are performed using the digital filters for sine<br />
and cosine transforms of Anderson (1975). Further details<br />
are available in the thesis of Esparza (1991).<br />
3 Series and parallel impedances and their derivatives<br />
The series-parallel transformation<br />
The horizontal components of the electromagnetic<br />
field are linearly related through a second order impedance<br />
tensor (e.g., Swift, 1967). That is,<br />
(C.1)<br />
where Zxx, Zxy, Zyx and Zyy are complex numbers. Ex, Zy are the<br />
orthogonal components of the electric field and Hx, Hy are<br />
the corresponding magnetic field components. Following<br />
the work of Romo et al. (2005), we use an alternative<br />
representation defined by the following transformation<br />
(C.2)<br />
where<br />
(C.3)<br />
(C.4)<br />
(C.5)<br />
(C.6)<br />
If we consider a 2-D case in which the <strong>magnetotelluric</strong><br />
responses are solely characterized by ZTM = Zxy and ZTE =<br />
4<br />
u<br />
+<br />
λ<br />
.<br />
|<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
|<br />
|<br />
|<br />
2<br />
0<br />
x<br />
E<br />
x<br />
H<br />
x<br />
y<br />
a<br />
ωµ<br />
σ = (A.13)<br />
].<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
Re[<br />
|<br />
|<br />
2<br />
|<br />
|<br />
x<br />
H<br />
x<br />
H<br />
x<br />
E<br />
x<br />
E<br />
y<br />
y<br />
x<br />
x<br />
a<br />
a<br />
δ<br />
δ<br />
σ<br />
σ<br />
δ −<br />
−<br />
= (A.14)<br />
'.<br />
'<br />
)<br />
'<br />
,<br />
'<br />
(<br />
)<br />
'<br />
,<br />
'<br />
(<br />
)<br />
,<br />
,<br />
(<br />
)<br />
,<br />
( 13<br />
12<br />
11<br />
dz<br />
dx<br />
z<br />
x<br />
z<br />
x<br />
g<br />
g<br />
g<br />
z<br />
x<br />
x<br />
δσ<br />
= ∫ E (A.15)<br />
.<br />
1<br />
0<br />
2<br />
ρ<br />
ρ<br />
σ<br />
ωµ ∇<br />
×<br />
∇<br />
−<br />
=<br />
−<br />
∇ y<br />
y<br />
y<br />
H<br />
H<br />
i<br />
H (A.16)<br />
.<br />
)<br />
0<br />
(<br />
)<br />
,<br />
(<br />
2 z<br />
i<br />
y<br />
e<br />
H<br />
z<br />
x<br />
H<br />
−<br />
= (A.17)<br />
.<br />
2<br />
)<br />
0<br />
(<br />
)<br />
,<br />
(<br />
2 z<br />
i<br />
x<br />
e<br />
i<br />
H<br />
z<br />
x<br />
E<br />
−<br />
=<br />
σδ<br />
(A.18)<br />
4<br />
.<br />
)<br />
2<br />
( '<br />
)<br />
2<br />
( z<br />
i<br />
u<br />
TE<br />
e<br />
u<br />
i<br />
G<br />
+<br />
−<br />
λ<br />
+<br />
λ<br />
λ<br />
+<br />
+<br />
λ<br />
= (A.12)<br />
.<br />
|<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
|<br />
|<br />
|<br />
2<br />
0<br />
x<br />
E<br />
x<br />
H<br />
x<br />
y<br />
a<br />
ωµ<br />
σ = (A.13)<br />
].<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
)<br />
0<br />
,<br />
(<br />
Re[<br />
|<br />
|<br />
2<br />
|<br />
|<br />
x<br />
H<br />
x<br />
H<br />
x<br />
E<br />
x<br />
E<br />
y<br />
y<br />
x<br />
x<br />
a<br />
a<br />
δ<br />
δ<br />
σ<br />
σ<br />
δ −<br />
−<br />
= (A.14)<br />
'.<br />
'<br />
)<br />
'<br />
,<br />
'<br />
(<br />
)<br />
'<br />
,<br />
'<br />
(<br />
)<br />
,<br />
,<br />
(<br />
)<br />
,<br />
( 13<br />
12<br />
11<br />
dz<br />
dx<br />
z<br />
x<br />
z<br />
x<br />
g<br />
g<br />
g<br />
z<br />
x<br />
dE x<br />
δσ<br />
= ∫ E (A.15)<br />
.<br />
1<br />
0<br />
2<br />
ρ<br />
ρ<br />
σ<br />
ωµ ∇<br />
×<br />
∇<br />
−<br />
=<br />
−<br />
∇ y<br />
y<br />
y<br />
H<br />
H<br />
i<br />
H (A.16)<br />
.<br />
)<br />
0<br />
(<br />
)<br />
,<br />
(<br />
2 z<br />
i<br />
y<br />
e<br />
H<br />
z<br />
x<br />
H<br />
−<br />
= (A.17)<br />
.<br />
2<br />
)<br />
0<br />
(<br />
)<br />
,<br />
(<br />
2 z<br />
i<br />
x<br />
e<br />
i<br />
H<br />
z<br />
x<br />
E<br />
−<br />
=<br />
σδ<br />
(A.18)<br />
5<br />
11<br />
g<br />
x<br />
E<br />
δ<br />
11<br />
g<br />
.<br />
)]<br />
'<br />
(<br />
cos[<br />
]<br />
[<br />
2<br />
1<br />
)<br />
'<br />
,<br />
'<br />
;<br />
,<br />
(<br />
)<br />
'<br />
(<br />
|<br />
'<br />
|<br />
0<br />
2<br />
11<br />
λ<br />
−<br />
λ<br />
+<br />
πσδ<br />
−<br />
=<br />
+<br />
−<br />
−<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
e<br />
e<br />
u<br />
z<br />
x<br />
z<br />
x<br />
g<br />
z<br />
z<br />
u<br />
z<br />
z<br />
u<br />
(A.19)<br />
].<br />
)]<br />
'<br />
(<br />
cos[<br />
2<br />
Re[<br />
'<br />
)<br />
2<br />
(<br />
0<br />
2<br />
λ<br />
−<br />
λ<br />
πδ<br />
=<br />
+<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
ue<br />
G<br />
z<br />
i<br />
u<br />
TM<br />
(A.20)<br />
1, 1<br />
' '<br />
i i j j<br />
x x x z z z<br />
+ +<br />
≤ ≤ ≤ ≤<br />
'.<br />
'<br />
)<br />
'<br />
,<br />
'<br />
,<br />
(<br />
2<br />
1<br />
1<br />
dz<br />
dx<br />
z<br />
x<br />
x<br />
G<br />
I<br />
TE<br />
x<br />
x<br />
z<br />
z<br />
TE<br />
i<br />
i<br />
j<br />
j<br />
δ<br />
= ∫<br />
∫<br />
+<br />
+<br />
(B.1)<br />
×<br />
−<br />
+<br />
λ<br />
+<br />
λ<br />
+<br />
λ<br />
+<br />
λ<br />
π<br />
=<br />
+<br />
−<br />
+<br />
−<br />
∞<br />
+<br />
∫<br />
]<br />
[<br />
)<br />
2<br />
)(<br />
(<br />
)<br />
2<br />
(<br />
2 )<br />
2<br />
(<br />
)<br />
2<br />
(<br />
0<br />
1 j<br />
j<br />
z<br />
i<br />
u<br />
z<br />
i<br />
u<br />
TE<br />
e<br />
e<br />
i<br />
u<br />
u<br />
i<br />
I<br />
.<br />
)]]<br />
(<br />
sin[<br />
)]<br />
(<br />
[sin[ 1 λ<br />
λ<br />
λ d<br />
x<br />
x<br />
x<br />
x i<br />
i<br />
−<br />
−<br />
− + (B.2)<br />
×<br />
−<br />
+<br />
λ<br />
π<br />
=<br />
+<br />
−<br />
+<br />
−<br />
∞<br />
+<br />
∫<br />
]<br />
[<br />
)<br />
2<br />
(<br />
2 )<br />
2<br />
(<br />
)<br />
2<br />
(<br />
0<br />
1 j<br />
j<br />
z<br />
i<br />
u<br />
z<br />
i<br />
u<br />
TM<br />
e<br />
e<br />
i<br />
u<br />
u<br />
I<br />
.<br />
)]]<br />
(<br />
sin[<br />
)]<br />
(<br />
[sin[ 1 λ<br />
−<br />
λ<br />
−<br />
−<br />
λ + d<br />
x<br />
x<br />
x<br />
x i<br />
i (B.3)<br />
TE<br />
I<br />
TM<br />
I<br />
|<br />
| a<br />
σ<br />
1<br />
x<br />
m<br />
x<br />
1<br />
z<br />
m<br />
z<br />
[ ]<br />
1<br />
, +<br />
i<br />
i x<br />
x<br />
[ ]<br />
1<br />
, +<br />
i<br />
i z<br />
z<br />
]<br />
,<br />
( 1<br />
x<br />
−∞<br />
)<br />
,<br />
[ +∞<br />
n<br />
x<br />
)<br />
,<br />
[ +∞<br />
m<br />
z<br />
,<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
=<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
y<br />
x<br />
yy<br />
yx<br />
xy<br />
xx<br />
y<br />
x<br />
H<br />
H<br />
Z<br />
Z<br />
Z<br />
Z<br />
E<br />
E<br />
(C.1)<br />
xx<br />
Z<br />
xy<br />
Z<br />
yx<br />
Z yy<br />
Z<br />
x<br />
E<br />
y<br />
E<br />
.<br />
)]<br />
'<br />
(<br />
cos[<br />
]<br />
[<br />
2<br />
1<br />
)<br />
'<br />
,<br />
'<br />
;<br />
,<br />
)<br />
'<br />
(<br />
|<br />
'<br />
|<br />
0<br />
2<br />
λ<br />
−<br />
λ<br />
+<br />
πσδ<br />
−<br />
=<br />
+<br />
−<br />
−<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
e<br />
e<br />
u<br />
z<br />
x<br />
z<br />
z<br />
z<br />
u<br />
z<br />
z<br />
u<br />
(A.19)<br />
].<br />
)]<br />
'<br />
(<br />
cos[<br />
2<br />
Re[<br />
'<br />
)<br />
2<br />
(<br />
0<br />
2<br />
λ<br />
−<br />
λ<br />
πδ<br />
=<br />
+<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
ue<br />
G<br />
z<br />
i<br />
u<br />
TM<br />
(A.20)<br />
1<br />
'<br />
j j<br />
z z +<br />
≤ ≤<br />
'.<br />
'<br />
)<br />
'<br />
,<br />
'<br />
,<br />
(<br />
2<br />
1<br />
1<br />
dz<br />
dx<br />
z<br />
x<br />
x<br />
G<br />
I<br />
TE<br />
x<br />
x<br />
z<br />
z<br />
TE<br />
i<br />
i<br />
j<br />
j<br />
δ<br />
= ∫<br />
∫<br />
+<br />
+<br />
(B.1)<br />
×<br />
−<br />
+<br />
λ<br />
+<br />
λ<br />
+<br />
λ<br />
+<br />
λ<br />
π<br />
+<br />
−<br />
+<br />
−<br />
∞<br />
+<br />
∫<br />
]<br />
[<br />
)<br />
2<br />
)(<br />
(<br />
)<br />
2<br />
(<br />
2 )<br />
2<br />
(<br />
)<br />
2<br />
(<br />
0<br />
1 j<br />
j<br />
z<br />
i<br />
u<br />
z<br />
i<br />
u<br />
e<br />
e<br />
i<br />
u<br />
u<br />
i<br />
.<br />
)]]<br />
(<br />
sin[<br />
)]<br />
(<br />
[sin[ 1 λ<br />
λ<br />
λ d<br />
x<br />
x<br />
x<br />
x i<br />
i<br />
−<br />
−<br />
− + (B.2)<br />
×<br />
−<br />
+<br />
λ<br />
π<br />
+<br />
−<br />
+<br />
−<br />
∞<br />
+<br />
∫<br />
]<br />
[<br />
)<br />
2<br />
(<br />
2 )<br />
2<br />
(<br />
)<br />
2<br />
(<br />
0<br />
1 j<br />
j<br />
z<br />
i<br />
u<br />
z<br />
i<br />
u<br />
e<br />
e<br />
i<br />
u<br />
u<br />
.<br />
)]]<br />
(<br />
sin[<br />
)]<br />
(<br />
[sin[ 1 λ<br />
−<br />
λ<br />
−<br />
−<br />
λ + d<br />
x<br />
x<br />
x<br />
x i<br />
i (B.3)<br />
,<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
=<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
y<br />
x<br />
yy<br />
yx<br />
xy<br />
xx<br />
y<br />
x<br />
H<br />
H<br />
Z<br />
Z<br />
Z<br />
Z<br />
E<br />
E<br />
(C.1)<br />
11<br />
g<br />
x<br />
E<br />
δ<br />
11<br />
g<br />
.<br />
)]<br />
'<br />
(<br />
cos[<br />
]<br />
[<br />
2<br />
1<br />
)<br />
'<br />
,<br />
'<br />
;<br />
,<br />
(<br />
)<br />
'<br />
(<br />
|<br />
'<br />
|<br />
0<br />
2<br />
11<br />
λ<br />
−<br />
λ<br />
+<br />
πσδ<br />
−<br />
=<br />
+<br />
−<br />
−<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
e<br />
e<br />
u<br />
z<br />
x<br />
z<br />
x<br />
g<br />
z<br />
z<br />
u<br />
z<br />
z<br />
u<br />
(A.19)<br />
].<br />
)]<br />
'<br />
(<br />
cos[<br />
2<br />
Re[<br />
'<br />
)<br />
2<br />
(<br />
0<br />
2<br />
λ<br />
−<br />
λ<br />
πδ<br />
=<br />
+<br />
−<br />
∞<br />
∫<br />
d<br />
x<br />
x<br />
ue<br />
G<br />
z<br />
i<br />
u<br />
TM<br />
(A.20)<br />
1, 1<br />
' '<br />
i i j j<br />
x x x z z z<br />
+ +<br />
≤ ≤ ≤ ≤<br />
'.<br />
'<br />
)<br />
'<br />
,<br />
'<br />
,<br />
(<br />
2<br />
1<br />
1<br />
dz<br />
dx<br />
z<br />
x<br />
x<br />
G<br />
I<br />
TE<br />
x<br />
x<br />
z<br />
z<br />
TE<br />
i<br />
i<br />
j<br />
j<br />
δ<br />
= ∫<br />
∫<br />
+<br />
+<br />
(B.1)<br />
×<br />
−<br />
+<br />
λ<br />
+<br />
λ<br />
+<br />
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xx<br />
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2<br />
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xx<br />
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arctan(<br />
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xx<br />
Z<br />
Z<br />
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).<br />
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2<br />
1<br />
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xy<br />
xx<br />
yy<br />
Z<br />
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2<br />
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x<br />
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xx<br />
Z<br />
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xx<br />
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x<br />
x<br />
x<br />
x i<br />
i<br />
−<br />
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−<br />
λ<br />
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x<br />
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i (B.3)<br />
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−<br />
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x<br />
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x<br />
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−<br />
λ<br />
−<br />
−<br />
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x<br />
x<br />
x<br />
x i<br />
i (B.3)