VẬT lý địa CHẤN 11 plusminus

h

TSG = TSA + TAB + TBG = 2TSA + TAB

(
x − 2h tan ic )
h
=2
+
v1 cosic
v2
x 2h cosic
= +
v2
v1

= delay time


Delay time ti
t

1
----v1

1
----v2
2

2

2h v2 – v1
x +-------------------t = --v2
v1 v 2

ti
x

xcross

x
t = ----- + ti
v2

x

h=

h
v1
v2

v1v2
2 v22 − v12

ti


t AG = x / V2 + δt g + δt a
t BG = ( L − x) / V2 + δt g + δtb
t AB = L / V2 + δt a + δtb

Hagendoorn’s T- term
T − = t AG − t BG
= (2 x − L) / V2 + δt a − δtb

Hagendoorn’s T+ term

T + = t AG + t BG − t AB =
2δt g = 2 z g cos(Θ c ) / V1

z g = T +V1 / 2 cos(Θ c ) =
T +V1V2 / 2 V22 − V12


(a) Composite travel time-distance
(b) Hagedoorns T- graph and (c) calculated
Depths to a refractor