[cig-commits] r12031 - seismo/3D/automeasure/latex

Tue May 27 04:40:54 PDT 2008

Author: alessia
Date: 2008-05-27 04:40:54 -0700 (Tue, 27 May 2008)
New Revision: 12031

Modified:
   seismo/3D/automeasure/latex/AM-allcitations.bib
   seismo/3D/automeasure/latex/Makefile
   seismo/3D/automeasure/latex/manual_introduction.tex
   seismo/3D/automeasure/latex/manual_method.tex
   seismo/3D/automeasure/latex/manual_technical.tex
Log:
working on manual

Modified: seismo/3D/automeasure/latex/AM-allcitations.bib
===================================================================

--- seismo/3D/automeasure/latex/AM-allcitations.bib	2008-05-27 06:16:17 UTC (rev 12030)
+++ seismo/3D/automeasure/latex/AM-allcitations.bib	2008-05-27 11:40:54 UTC (rev 12031)
@@ -3995,6 +3995,15 @@
 	Volume = 250,
 	Year = 2006}
 
+ at article{MaggiEtal2008,
+  author = {Maggi, A. and Tape, C. and Chen, M. and Chao, D. and Tromp, J.},
+  journal = gji,
+  pages = {},
+  title = {An automated time-window selection algorithm for seismic tomography},
+  volume = XX,
+  year = 2008
+  }
+
 @article{MJJ99,
 	Author = {Mahatsente, R. and Jentzsch, G. and Jahr, T.},
 	Journal = tectphys,

Modified: seismo/3D/automeasure/latex/Makefile
===================================================================
--- seismo/3D/automeasure/latex/Makefile	2008-05-27 06:16:17 UTC (rev 12030)
+++ seismo/3D/automeasure/latex/Makefile	2008-05-27 11:40:54 UTC (rev 12031)
@@ -41,7 +41,8 @@
 	$(LATEX)  flexwin_paper
 
 manual:${MANUAL}
-	xpdf ${MANUAL}
+	echo ${MANUAL}
+#	xpdf ${MANUAL}
 
 paper:${PAPER}
 	echo ${PAPER}

Modified: seismo/3D/automeasure/latex/manual_introduction.tex
===================================================================
--- seismo/3D/automeasure/latex/manual_introduction.tex	2008-05-27 06:16:17 UTC (rev 12030)
+++ seismo/3D/automeasure/latex/manual_introduction.tex	2008-05-27 11:40:54 UTC (rev 12031)
@@ -1,57 +1,31 @@
 \chapter{Introduction}
 
-Seismic tomography - the process of imaging the 3D structure of the Earth using
-seismic recordings - has been transformed by recent advances in methodology.
-Finite-frequency approaches are been used instead of ray-based approaches, and 3D reference models instead of 1D reference models.
+The FLEXWIN software package automates the time-window selection problem for
+seismology.  It operates on pairs of observed and synthetic single component
+seismograms, defining windows that cover as much of a given seismogram as
+possible, whilst avoiding portions of the waveform that are dominated by noise.  
 
-It is common practice in tomography to work only with certain subsets of the
-available seismic data. The choices made in selecting these subsets are
-inextricably linked to the assumptions made in the tomographic method.  For example, ray-based
-travel-time tomography deals
-only with high frequency body wave arrivals, while great-circle
-surface wave tomography must satisfy the path-integral approximation,
-and only considers surface waves that present no evidence of multipathing.  
-In both these examples, a large proportion of the information contained within the seismograms goes to waste.
-The emerging 3D-3D tomographic methods take advantage of
-full wavefield simulations and numeric finite-frequency kernels,
-thereby reducing
-the data restrictions required when using approximate forward modelling and simplified descriptions
-of sensitivity.  
-In order to exploit the
-full power of 3D-3D tomographic methods, we require a new data selection
-strategy that does not exclude such complex arrivals.
-This data selection strategy should define measurement time windows that cover as much of a given seismogram as possible, whilst avoiding portions of
-the waveform that are dominated by noise.
-
-Our answer to the time-window selection problem is FLEXWIN (FLEXible WINdowing).
-
-From a signal processing point of view, the simplest way to avoid serious
-contamination by noise is to select and measure strong signals, which in
-seismology correspond to seismic arrivals.  FLEXWIN selects time windows on the synthetic seismogram within which the waveform
+FLEXWIN selects time windows on the synthetic seismogram within which the waveform
 contains a distinct energy arrival, then requires an adequate correspondence
 between observed and synthetic waveforms within these windows.  This selection
 paradigm is general, and can be applied to synthetic seismograms regardless of
-how they have been obtained.  It is clear, however, that a synthetic seismogram
-obtained by 3D propagation through a good 3D Earth model will provide a better
-fit to the observed seismogram over a greater proportion of its length than
-will be the case for a more approximate synthetic seismogram.
+how they have been obtained.  
 
-In order to the isolate changes in amplitude or frequency content susceptible of being
-associated with distinct energy arrivals, we need to analyse the character of the synthetic waveform itself.  This analysis is similar to that used on observed waveforms
-in automated phase detection algorithms for the routine location of
-earthquakes.  FLEXWIN takes a tool used in this detection process ---
-the long-term / short-term ratio --- and applies it to the definition of
-time windows around distinct seismic phases.  
+There is no restriction on the type of simulation used to
+generate the synthetics, though realistic Earth models and more complete
+propagation theories yield waveforms that are more similar to the observed
+seismograms, and thereby allow the definition of measurement windows covering
+more of the available data.  The input seismograms can be measures of
+displacement, velocity or acceleration, indifferently.  There is no requirement
+for horizontal signals to be rotated into radial and transverse directions.
 
-The choices made in time-window selection for tomography are
-interconnected with all aspects of the tomographic inversion process,
-from the waveform simulation method (direct problem), through the choice of
-measurement method, to the method
-used to obtain sensitivity kernels.  One of the major difficulties in defining
-a general data selection strategy is the great range of possible choices open
-to the tomographer.  FLEXWIN is a configurable data selection process
-that can be adapted to different tomographic scenarios by tuning a handful of
-parameters (see Table~\ref{tb:params}).  Although we have designed our
-algorithm for use in adjoint tomography, its inherent flexibility should make
-it useful in many data-selection applications.
+FLEXWIN is a configurable data selection process that can be adapted to
+different tomographic scenarios by tuning a handful of parameters.  Although
+the algorithm was designed for use in 3D-3D adjoint tomography, its inherent
+flexibility should make it useful in many data-selection applications.
 
+For a detailed introduction to FLEXWIN as applied to seismic tomography, please consult \cite{MaggiEtal2008}.
+
+If you use FLEXWIN for your own research, please cite \cite{MaggiEtal2008}.
+
+

Modified: seismo/3D/automeasure/latex/manual_method.tex
===================================================================
--- seismo/3D/automeasure/latex/manual_method.tex	2008-05-27 06:16:17 UTC (rev 12030)
+++ seismo/3D/automeasure/latex/manual_method.tex	2008-05-27 11:40:54 UTC (rev 12031)
@@ -49,7 +49,6 @@
 \end{table}
 
 
-
 %----------------------
 
 \pagebreak

Modified: seismo/3D/automeasure/latex/manual_technical.tex
===================================================================
--- seismo/3D/automeasure/latex/manual_technical.tex	2008-05-27 06:16:17 UTC (rev 12030)
+++ seismo/3D/automeasure/latex/manual_technical.tex	2008-05-27 11:40:54 UTC (rev 12031)
@@ -61,7 +61,7 @@
 [TODO] list of subroutines
 \end{verbatim}
 
-\subsubsection{Output formats}
+\subsection{Output formats}
 The code outputs a set of text files per pair of observed and synthetic
 seismograms analysed.  All text files have a number of header lines, prefixed by {\tt \#} with a set of name-value pairs.
 

