[CIG-SHORT] reg: RELAX run

[Anil Earnest]

Hi,
     I was trying to do a co-seismic simulation using RELAX for the 2004
Sumatra-Andaman earthquake. Issue is that the simulated rupture
segments are coming on diagonally opposite quadrant than expected.
Could you please help me in resolving this. Attaching the
visualization as a pdf file.

Thanks in advance.

- Anil Earnest

 I took slip-data from:
http://www.tectonics.caltech.edu/slip_history/2004_sumatra/update1/slipAceh_BSSA2007

Based on the RELAX examples;

Reformatted the above fault geometry as:
awk '{print $1, $2, $3, $4, $5, $6, $7}' slipAceh_BSSA2007 | awk '{if
(substr($0,0,1)==">"){print "#"}else{print $0}}' | proj +proj=utm +zone=46
+datum=WGS84 +geoc |  awk '{print(NR,
$3,($1-817174.63)/1e3,($2-369446.69)/1e3,$7,15,12,$5,$6,$4)}' > anda.flt

for coast-lines I used:
 pscoast -R90/100/0/20 -JM -Df -W1 -m | proj +proj=utm +zone=46
+datum=WGS84 +geoc | awk '{if (substr($0,0,1)==">"){print "#"}else{print
$0}}' | awk '{if (substr($0,1,1)=="*"){print ">"}
else{x=($1-817174.63)/1e3;y=($2-369446.69)/1e3;print x,y,0}}' >
coasts_km.xyz

and ran using the following script:

#/bin/bash

# Mw 9.2 2004 Sumatra-Andaman earthquake coseismic displacements
#
# echo 95.854 3.316 | proj +proj=utm +zone=46 +datum=WGS84 +geoc
# 817174.63	369446.69
#
FLT=faults/anda.flt
#
# output directory based on script name.
WDIR=$(basename $0 .sh)

if [ ! -e $WDIR ]; then
	echo $(basename $0): creating directory $WDIR
	mkdir $WDIR
fi

OMP_NUM_THREADS=4 time relax $* <<EOF | tee $WDIR/in.param
# grid dimension (sx1,sx2,sx3)
512 512 512
# sampling (dx1,dx2,dx3), smoothing (beta, nyquist)
16 16 4 0.2 1
# origin position (x0,y0) and rotation
0 0 0
# geographic origin (longitude, latitude, UTM zone, unit)
95.854 3.316 46 1e3
# observation depth (displacement and stress)
0 15
# output directory
$WDIR
# lambda, mu, gamma (gamma = (1 - nu) rho g / mu)
1 1 1e-5
# time interval, (positive time step) or (negative skip, scaling)
0 -1 1
# number of observation planes
0
# number of observation points
0
# number of Coulomb planes
0
# number of prestress interfaces
0
# number of linear viscous interfaces
0
# number of nonlinear viscous interfaces
0
# number of fault creep interfaces
0
# number of inter-seismic strike-slip segments
0
# number of inter-seismic opening segments
0
# number of events
1
# number of coseismic shear-slip segments (ns)
`grep -v "#" $FLT | wc`
# no.     slip       xs       ys       zs  length   width strike   dip   rake
`grep -v "#" $FLT`
# number of tensile cracks
0
# number of mogi source
0
# number of surface traction
0
EOF

-------

visualized using :
grdmap.sh -b -750/1550/-550/1300 -e gmt/ecoast.sh coseismic/000
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