Earthquake+Data+Integration Gocad
Transcript of Earthquake+Data+Integration Gocad
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Earthquake Data Integration
GOCAD Instructions
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Earthquake Data Integration
• Earthquakes and Structural Geology
• Beach balls and other plots
• Using GOCAD
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Earthquakes and Structure
Location of faults Type of fault,orientation of fault plane
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Beach balls and other plots
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Beach balls and other plots
map
Dilational first arrival
Compressionalfirst arrival
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Beach balls and other plots
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Using GOCAD
• For integration with other data (topography, geologic sections, fault models, bore holes …)
• For 3d visualization
• see demo
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Using GOCAD
Tutorial user information:
use SSH to login to rupture
user: tutorialpw : ask George
rupture 01% cd beachballs/epslabX
u:\beachballs\epslabX\*
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Using GOCAD
Typical raw data of focal mechanisms
• Input for psmeca module of GMT plotting software: 33.75 -118.13 -10.86 220.00 75.00 -70.00 2.40 000 000 43732 Lat. Long. Depth strike dip rake Mag. Xmp Ymp Name
uses strike of nodal plane
• Output of FPFIT program:
810223 1921 4.93 33-30.23 116-46.57 0.95 1.40 19 0 19.0 0.09 0.2 1.6 c 255 80 160 0.00 12 0.08 0.74 0.00 15 33 20C* 0 Date Time Sec. Latitude Longitude Dept Mag A1 A2 A3 A4 h_e v_e M ddi dp rak A5 A6 A7 A8 A9 A10 A11 A12 EventID
uses dip direction of nodal plane
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Using GOCAD
Importing GMT style data into GOCAD:
rupture 85% cd gmt
• Convert geographic coordinates to UTM coordinates:
rupture 93% proj -r +proj=utm +zone=11 smb81_98.geo > smb81_98.utm
• Convert UTM file to GOCAD file:
rupture 105% /sger/tools/beachball.awk smb81_98.utm > smb81_98.gp
beachball.awk expects STRIKE
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Using GOCAD
More beach ball options:
rupture 85% cd gmt
• Produce larger beach balls:
rupture 105% /sger/tools/beachball.awk RADIUS=1000 smb81_98.utm > smb81_98.gp
The variable RADIUS defines the radius of a magnitude 1 focal sphere (default = 200).
• Produce nodal planes and P-T axes:
rupture 105% /sger/tools/nodals.awk smb81_98.utm > smb81_98.nod
You can use the variable RADIUS with nodals.awk as well.nodals.awk expects STRIKE.
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Using GOCAD
Importing FPFIT style data into GOCAD:
rupture 85% cd fpfit
• Convert FPFIT file to GMT style file:
rupture 118% /sger/tools/fpfit2geo.awk smb81_98.fps > smb81_98.geo
• Convert geographic coordinates to UTM coordinates• Convert UTM file to GOCAD file:
rupture 105% /sger/tools/beachball_ddir.awk smb81_98.utm > smb81_98.gp
beachball_ddir.awk/nodals_ddir.awk expect DIP DIRECTION
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Using GOCAD
Beach ball summary:
• beachball.awk usage:beachball.awk [RADIUS=meter] gmtfile > gocadfilegmtfile format: any number of lines containingX[m] Y[m] Z[km] strike dip rake magnitude 0 0 Name
• beachball expects strike, beachball_ddir dip direction
• nodals[_ddir].awk produces nodal planes/P-T axes, same usage
• use proj to convert geographic coordinates into utm
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Using GOCAD
Importing large EQ data sets in GOCAD:
rupture 85% cd mining
• Convert FPFIT file to GMT style file:
rupture 118% /sger/tools/fpfit2geo.awk smb81_98.fps > smb81_98.geo
• Convert geographic coordinates to UTM coordinates• Convert UTM file to GOCAD point set file:
rupture 144% /sger/tools/eq2vs.awk smb81_98.utm > smb81_98.vs
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Using GOCAD
Filtering large EQ data sets in GOCAD:
change property used for colors
Choose color map or make one (Edit)
Custom color map for rakeright-lateral
right-lateral
left-lateral
thrust sense
normal sense
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Using GOCAD
Filtering large EQ data sets in GOCAD (example):
change to date
choose color map rainbow1
edit Low and High clip values
make transparent to displayonly earthquakes in 1982
Use property regions to separateearthquakes by date, magnitude ..
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Using GOCAD
Filter with a GOCAD script and export to GMT style file:
Type in script
Or load file:gocadfilter.script
Convert smb81_98_mag3to beach balls