Page 142 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

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(b) low frequency input seismic signals.
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Selsmic Response (Minimum Phase):

Total Seismic
sees
Sem
Seismic Response (Minimum Phase)
Total Selsmic
125
Trace
Trace

=
Waveform
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3rd
3rd

Interfaces
+
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Intertaces
Seismic
2nd
2nd
|

+
+
interfaces with (a) high frequency and
fst
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+1
+1
Reflection
Coefficient
Coeficient
Reflection

0
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1
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Model
Model
Response of reflections
Se
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2nd
1st
3rd
1st
Signal
Input
Signal
Input
5.27
FIGURE
a
b
:
TES EN RE EGE! SPT ME mS Baer
(5) oun poansy . = assy rome x Re ayow ee * e Ri ware ence trace seismic the coefficients, reflection the of spacing time the to relative broad is 5.27b). (Fig. events overlapping the by caused pattern interference the shows Noise seismic a of deflection the as defined be can profile reflection seismic a on Noise which Noise interface.
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Analysis . AGM-OML ABM -OML reflection input positive of that the is (Fig. 5.26c). the If three input
Waveform Zero Phase Zero Phase response for reflection coefficient. coefficient, layers. the as is coefficient than greater > 0). The (RC If 5.26b). coefficient signal one than interface. signal), the however,
And Seismic Response Minimum Phase Seismic Response Minimum Phase reflection two the polarity is positive (Fig. reflection input the more is each input the If,
Processing, Zero Phase +1 +41 phase seismic signals. b) Seismic for negative the of of impedance opposite or reflection the reflecting layer be will input signal the <I,), of there When for responses of width the 5.27a). (Fig.
Acquisition, Input Selsmic Signal (‘Pulse’) . Reflection Coefficient (RC>O) Oo “1 ~ootficiont (RC <0) #0 -1 the strength acoustic same the has whether the of coefficient the as is smaller (I, opposite polarity Interfaces the of sum (compared to trace seismic
Reflection: Minimum Phase Acoustic Impedance Increases) I —N imnendence Decreases) ly. zero phase and reflection coefficient. c) Seismic response and wave the in wave depends on impedance reflection polarity same layer the is Several the is apart the on
Seismic (l= pV / («pV minimum incident difference reflected the 5.26a) acoustic the I,), > the reflecting reflection from trace seismic far appear
Input positive of the the on Whether (Fig. the If (1, has of the < 0). The Reflections the sufficiently will
Chapters Model nave 202 Sw Model AY) (2Y,< PY a) 5.26 interface with amplitude depends signal mic negative. above layer reflection impedance (RC tive interface are faces events tinct
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124 b Ev AY a FIGURE at ing
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