[cig-commits] r11539 - seismo/3D/automeasure/latex
alessia at geodynamics.org
alessia at geodynamics.org
Mon Mar 24 10:24:27 PDT 2008
Author: alessia
Date: 2008-03-24 10:24:26 -0700 (Mon, 24 Mar 2008)
New Revision: 11539
Modified:
seismo/3D/automeasure/latex/AM-allcitations.bib
seismo/3D/automeasure/latex/README
seismo/3D/automeasure/latex/discussion.tex
Log:
First draft of discussion partially written
Modified: seismo/3D/automeasure/latex/AM-allcitations.bib
===================================================================
--- seismo/3D/automeasure/latex/AM-allcitations.bib 2008-03-24 16:27:36 UTC (rev 11538)
+++ seismo/3D/automeasure/latex/AM-allcitations.bib 2008-03-24 17:24:26 UTC (rev 11539)
@@ -1,8 +1,8 @@
-%% Created for alessia at 2008-03-22 20:03:14 +0100
+%% Created for alessia at 2008-03-24 17:35:16 +0100
-%% Saved with string encoding Unicode (UTF-8)
+%% Saved with string encoding Occidental (ASCII)
@string{ag = {Ann. Geophys.}}
@@ -94,6 +94,16 @@
@string{tectphys = {Tectonophysics}}
+ at article{TrampertSpetzler2006,
+ Author = {Trampert, J. and Spetzler, J.},
+ Date-Added = {2008-03-24 17:26:01 +0100},
+ Date-Modified = {2008-03-24 17:27:27 +0100},
+ Journal = {Geophys. J. Int.},
+ Pages = {394--400},
+ Title = {Surface wave tomography: finite-frequency effects lost in the null space},
+ Volume = {164},
+ Year = {2006}}
+
@article{McLarenEtal2008,
Author = {McLaren, M.K. and Hardebeck, J.L. and van der Elst, N. and Unruh, J. and Bawden, G.W. and Blai, J.L.},
Date-Added = {2008-03-22 19:56:11 +0100},
@@ -140,7 +150,8 @@
Journal = {J. Geophys. Res.},
Title = {{A three-dimensional crustal seismic velocity model for southern California from a composite event method}},
Volume = {112},
- Year = {2007}}
+ Year = {2007},
+ Bdsk-Url-1 = {http://dx.doi.org/10.1029/2007JB004977}}
@article{Hauksson2000,
Author = {Hauksson, E.},
@@ -180,7 +191,8 @@
Journal = {J. Geophys. Res.},
Title = {{Waveform modeling of the slab beneath Japan}},
Volume = {112},
- Year = {2007}}
+ Year = {2007},
+ Bdsk-Url-1 = {http://dx.doi.org/10.1029/2006JB004394}}
@article{ZhaoEtal1992,
Author = {Zhao, D. and Horiuchi, S. and Hasegawa, A.},
@@ -200,7 +212,8 @@
Journal = {J. Geophys. Res.},
Title = {{Deep structure of Japan subduction zone as derived from local, regional, and teleseismic events}},
Volume = {99},
- Year = {1994}}
+ Year = {1994},
+ Bdsk-Url-1 = {http://dx.doi.org/10.1029/2000JB000073}}
@article{ChenEtal2007b,
Author = {Chen, P. and Zhao, L. and Jordan, T.H.},
@@ -280,7 +293,8 @@
Journal = {Geochem. Geophys. Geosyst.},
Title = {A catalogue of deep mantle plumes. New results from finite-frequency tomography},
Volume = {7},
- Year = {2006}}
+ Year = {2006},
+ Bdsk-Url-1 = {http://dx.doi.org/10.1029/2006GC001248}}
@article{ZhouEtal2006,
Author = {Zhou, Y. and Nolet, G. and Dahlen, F.A. and Laske, G.},
@@ -290,7 +304,8 @@
Journal = {J. Geophys. Res.},
Number = {111},
Title = {Global upper-mantle structure from finite-frequency surface-wave tomography},
- Year = {2006}}
+ Year = {2006},
+ Bdsk-Url-1 = {http://dx.doi.org/10.1029/2005JB003677}}
@article{ZhouEtal2005,
Author = {Zhou, Y. and Dahlen, F.A. and Nolet, G. and Laske, G.},
@@ -5401,16 +5416,18 @@
Volume = 98,
Year = 1989}
- at article{ScholzC1998,
+ at article{ScholzContreras1998,
Author = {Scholz, C.H. and Contreras, J.C.},
+ Date-Modified = {2008-03-24 17:35:16 +0100},
Journal = geol,
Pages = {967--970},
Title = {Mechanics of continental rift architecture},
Volume = 26,
Year = 1998}
- at article{SMS97,
+ at article{SchuellerEtal1997,
Author = {Schueller, W. and Morozov, I.B. and Smithson, S.B.},
+ Date-Modified = {2008-03-24 17:32:07 +0100},
Journal = bssa,
Pages = {414--426},
Title = {Crustal and uppermost mantle velocity structure of northern {E}urasia along the profile {Q}uartz},
@@ -5434,16 +5451,18 @@
Volume = 101,
Year = 1996}
- at article{SengorK1979,
+ at article{SengorKidd1979,
Author = {Sengor, A.M.C. and Kidd, W.},
+ Date-Modified = {2008-03-24 17:35:00 +0100},
Journal = tect,
Pages = {361--376},
Title = {Post-collisional tectonics of the {T}urkish--{I}ranian {P}lateau and a comparison with {T}ibet},
Volume = 55,
Year = 1979}
- at article{Sha99,
+ at article{Shahabpour1999,
Author = {Shahabpour, J.},
+ Date-Modified = {2008-03-24 17:34:18 +0100},
Journal = jg,
Pages = {237--250},
Title = {The role of deep structures in the distribution of some major ore deposits in {I}ran, {NE} of the {Z}agros thrust zone},
@@ -5474,16 +5493,18 @@
Volume = 42,
Year = 1999}
- at article{Shi67,
+ at article{Shirakova1967,
Author = {Shirakova, E.I.},
+ Date-Modified = {2008-03-24 17:34:40 +0100},
Journal = {Izv. Acad., Nauk., USSR, Ser. Geophyz.},
Pages = {12--22},
Title = {General features in the orientation of principal stresses in earthquake foci in the {M}editerranean--{A}sian seismic belt},
Volume = 1,
Year = 1967}
- at article{Sib82,
+ at article{Sibson1982,
Author = {Sibson, R.H.},
+ Date-Modified = {2008-03-24 17:34:49 +0100},
Journal = bssa,
Pages = {151--163},
Title = {Fault zone models, heat flow and depth distribution of earthquakes in the continental crust of the {U}nited {S}tates},
@@ -5686,8 +5707,9 @@
Volume = 145,
Year = 2001}
- at article{SpetzlerTS2002,
+ at article{SpetzlerEtal2002,
Author = {Spetzler, J. and Trampert, J. and Snieder, R.},
+ Date-Modified = {2008-03-24 17:25:55 +0100},
Journal = gji,
Pages = {755--767},
Title = {The effect of scattering in surface wave tomography},
@@ -5884,8 +5906,9 @@
Volume = 49,
Year = 1984}
- at article{TatarHMWGC2002,
+ at article{TatarEtal2002,
Author = {Tatar, M. and Hatzfeld, D. and Martinod, J. and Walpersdorf, A. and Ghafori-Ashtiany, M. and Chery, J.},
+ Date-Modified = {2008-03-24 17:31:17 +0100},
Journal = grl,
Note = {10.1029/2002GL015427},
Number = 19,
@@ -5893,8 +5916,9 @@
Volume = 29,
Year = 2002}
- at article{TatarHA2004,
+ at article{TatarEtal2004,
Author = {Tatar, M. and Hatzfeld, D. and Ghafori-Ashtiany, M.},
+ Date-Modified = {2008-03-24 17:31:27 +0100},
Journal = gji,
Number = 2,
Pages = {255--266},
@@ -5936,8 +5960,9 @@
Volume = 102,
Year = 1990}
- at article{TP92,
+ at article{TaymazPrice1992,
Author = {Taymaz, T. and Price, S.},
+ Date-Modified = {2008-03-24 17:29:49 +0100},
Journal = gji,
Pages = {589--603},
Title = {The 1971 {M}ay 12 {B}urdur earthquake sequence, {SW} {T}urkey --- {A} synthesis of seismological and geological observations},
@@ -5953,8 +5978,9 @@
Volume = 104,
Year = 1999}
- at article{ThomasCSL99,
+ at article{ThomasEtal1999,
Author = {Thomas, J. C. and Cobbold, P. R. and Shein, V. S. and Le Douaran, S.},
+ Date-Modified = {2008-03-24 17:30:58 +0100},
Journal = tectphys,
Pages = {243--263},
Title = {Sedimentary record of late {P}aleozoic to {R}ecent tectonism in central {A}sia - analysis of subsurface data from the {T}uran and south {K}azak domains},
@@ -6020,16 +6046,18 @@
Volume = 200,
Year = 2002}
- at article{TF86,
+ at article{ToramaruFujii1986,
Author = {Toramaru, A. and Fujii, N.},
+ Date-Modified = {2008-03-24 17:30:07 +0100},
Journal = jgr,
Pages = {9239--9252},
Title = {Connectivity of melt phase in a partially molten peridotite},
Volume = 91,
Year = 1986}
- at article{TW95,
+ at article{TrampertWoodhouse1995,
Author = {Trampert, J. and Woodhouse, J.H.},
+ Date-Modified = {2008-03-24 17:30:22 +0100},
Journal = gji,
Pages = {675--690},
Title = {Global phase velocity of {L}ove and {R}ayleigh waves between 40 and 150 seconds},
@@ -6060,8 +6088,9 @@
Volume = 160,
Year = 2005}
- at article{TA70,
+ at article{TsaiAki1970,
Author = {Tsai, Y.-B. and Aki, K.},
+ Date-Modified = {2008-03-24 17:31:41 +0100},
Journal = jgr,
Pages = {5729--5743},
Title = {Precise focal depth determination from amplitude spectra of surface waves},
@@ -6077,8 +6106,9 @@
Volume = 32,
Year = 2005}
- at article{TH97,
+ at article{TsokasHansen1997,
Author = {Tsokas, G.N. and Hansen, R.O.},
+ Date-Modified = {2008-03-24 17:30:41 +0100},
Journal = jgr,
Pages = {20,585--20,597},
Title = {Study of the crustal thickness and the subducting lithosphere in {G}reece from gravity data},
Modified: seismo/3D/automeasure/latex/README
===================================================================
--- seismo/3D/automeasure/latex/README 2008-03-24 16:27:36 UTC (rev 11538)
+++ seismo/3D/automeasure/latex/README 2008-03-24 17:24:26 UTC (rev 11539)
@@ -1,12 +1,11 @@
-Alessia Maggi, 22-march-2008
+Alessia Maggi, 24-march-2008
TODOs:
* Alessia:
+ finish introduction with description of what is to follow
+ add envelopes to Figure 1
- + write first draft of discussion
- + write first draft of conclusion
+ + finsih first draft of discussion
+ write abstract
* Min+Carl:
Modified: seismo/3D/automeasure/latex/discussion.tex
===================================================================
--- seismo/3D/automeasure/latex/discussion.tex 2008-03-24 16:27:36 UTC (rev 11538)
+++ seismo/3D/automeasure/latex/discussion.tex 2008-03-24 17:24:26 UTC (rev 11539)
@@ -1,5 +1,16 @@
\section{Discussion}
+The window selection algorithm algorithm we describe in this paper was designed to solve the problem of automatically picking windows for adjoint problems, specifically for 3D-3D tomography as described by \cite{TrompEtal2005} and \cite{TapeEtal2007}. The specificity of adjoint methods is to turn measurements of the differences between observed and synthetic waveforms into adjoint sources that are subsequently used to determine the sensitivity kernels of the measurements themselves to the Earth model parameters. The manner in which the adjoint source is created is specific to each type of measurement (e.g. waveform difference, cross-correlation time-lags, multi-taper phase and amplitude anomalies), but once formulated can be applied indifferently to any part of the seismogram. Adjoint methods have been used to calculate kernels of various body and surface-wave phases with respect to isotropic elastic parameters and interface depths \citep{LiuTromp2006}, but also with respect to anisotropic elastic parameters \cite{SieminskiEtal2007a,SieminskiEtal2007b}. Adjoint methods allow us to calculate kernels for each and every wiggle on a given seismic record, thereby giving us access to virtually all the information contained within.
+
+It is becoming clear, as more and more finite-frequency tomography models are published, that better kernels on their own are not the answer to the problems of improving the resolution of tomographic stdies. \cite{TrampertSpetzler2006} and \cite{BoschiEtal2007} investigate the factors limiting the quality of finite-frequency tomography images, and conclude that incomplete and inhomogenous data coverage limits in practice the improvement in resolution that the kernels could provide. The ability of adjoint methods to deal with all parts of the seismogram indifferently means we can incorporate a much greater amount of information from each seismogram into a tomographic problem, leading to a much improved data coverage.
+
+The computational cost of constructing an adjoint kernel is independent of the number of portions of each seismogram we choose to measure, and also of the number of records of a given event we choose to work with (REF). It is therefore to our advantage to make measurements on as many records as possible, while covering as much as possible of each record. There are, however, certain limits we must be aware of. As mentioned in the introduction, there is nothing in the adjoint method itself that prevents us from constructing a kernel from measurements of seismic noise. As the purpose of 3D-3D tomography is to improve the fine details of Earth models, it would be counterproductive to pollute the inversion process with noise-kernels.
+
+The use of adjoint methods for tomography requires, therefore, a method of selecting and windowing seismograms that preserves from noise while at the same time extracting as much information as possible from the signals. The method must also be adaptable to the features that exist in the seismograms themselves, because 3D wavefield simulations are able to synthesize phases that do not exist in 1D simulations or traditional travel-time curves. These considerations led us to favour a signal processing approach to the problem of data selection, approach which led to the developement of the FLEXWIN algorithm we present here.
+
+
+
+
\begin{itemize}
\item Clearly the ideas came about when trying to figure out how to pick windows for adjoint problems. As calculations are long, we need to use the greatest amount of information from each seismogram. but we want to avoid noise! And be adaptable to features that exist in the seismograms but that cannot be incorporated in 1D travel time curves. Hence the signal processing based approach.
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