GMT ex08 : Geoware

胡植慶 Jyr-Ching HU, Dept. of Geosciences, NTU

ISOCHRON

SeismologyCMT_catalog.d: Harvard Centroid Moment Tensor earthquakes, 1976-2003 (to 09/31) [Harvard]. bigquake.tsv: Pacheco & Sykes catalog of large earthquakes [L-DEO] 64-02EHB.d: Engdahl, van der Hilst, Buland, 2003 relocated earthquakes > M5.5 [Engdahl] epic_quakes.dat: NOAA NEIC EPIC earthquake catalogue, 2100BC-2003 (to 12/31) [NEIC] gshap_globe.grd: Global seismic risk assessment [GSHAP] slab_contours.d: Depth contours of subducting slabs [Sambridge & Gudmundsson, 1998] map2_ice.grd: CRUST 2.0 1 x 1 degree model for Ice thickness [G. Laske et al, 2000] map2_rho1.grd: CRUST 2.0 1 x 1 degree model for density of water map2_rho2.grd: CRUST 2.0 1 x 1 degree model for density of ice map2_rho3.grd: CRUST 2.0 1 x 1 degree model for density of soft sediments map2_rho4.grd: CRUST 2.0 1 x 1 degree model for density of hard sediments map2_rho5.grd: CRUST 2.0 1 x 1 degree model for density of upper crust map2_rho6.grd: CRUST 2.0 1 x 1 degree model for density of middle crust map2_rho7.grd: CRUST 2.0 1 x 1 degree model for density of lower crust map2_rho8.grd: CRUST 2.0 1 x 1 degree model for density of mantle below Mohomap2_t0.grd: CRUST 2.0 1 x 1 degree model for boundary top of water map2_t1.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of water map2_t2.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of ice map2_t3.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of soft sediments map2_t4.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of hard sediments map2_t5.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of upper crustmap2_t6.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of middle crust map2_t7.grd: CRUST 2.0 1 x 1 degree model for boundary bottom of lower crust (Moho)

Plate Tectonicsridge.d: Outline of global spreading centers from Plates projecttransform.d: Outline of global transform faults from Plates project trench.d: Outline of global subduction zones from Plates projectcande_fz_and_features.b: Misc. global marine tectonic lineationscande_mag_lineations.b: Global marine magnetic lineationshs2_nuvel.vx.1.-1.grd: Global plate motions relative to HS2, x-component hs2_nuvel.vy.1.-1.grd: Global plate motions relative to HS2, y-componentnnr_nuvel1.vx.1.-1.grd: Global plate motions (Nuvel-1) assuming no-net-rotation, x-component nnr_nuvel1.vy.1.-1.grd: Global plate motions (Nuvel-1) assuming no-net-rotation, y-component nnr_nuvel1a.vx.1.-1.grd: Global plate motions (Nuvel-1a) assuming no-net-rotation, x-component nnr_nuvel1a.vy.1.-1.grd: Global plate motions (Nuvel-1a) assuming no-net-rotation, y-componentnuvel1.vx.1.5.grd: Global relative plate motions (Nuvel-1) x-componentnuvel1.vy.1.5.grd: Global relative plate motions (Nuvel-1) x-component

Potential Fieldsegm360.e.16.grd: EGM geoid, up to degree/order 16, 1 x 1 degree gridegm360.e.grav.grd: EGM gravity, up to degree/order 360, 30 x 30 min gridegm360.e.grd: EGM geoid, full solution (degree/order 360), 1 x 1 degree gridegm360.h.0.5.grd: EGM hydrostatic geoid, full solution (degree/order 360), 30 x 30 min gridegm360.h.16.grd: EGM hydrostatic geoid, up to degree/order 16, 1 x 1 degree grid egm360.h.grd: EGM hydrostatic geoid, full solution (degree/order 360), 1 x 1 degree grid osu91a1f.0.5.grd: Global geoid from Ohio State University, 30 x 30 min grid [OSU] geoid.9.2.img: Sandwell/Smith 2x2 min Mercator grid of geoid, version 9 [Sandwell/Smith] grav.9.1.img: Sandwell/Smith 1x1 min Mercator grid of gravity, version 9 [Sandwell/Smith] grav.11.2.img: Sandwell/Smith 2x2 min Mercator grid of gravity, version 11 [Sandwell/Smith] curv.7.2.img: Sandwell/Smith 2x2 min Mercator grid of vertical gravity gradient, version 7 [Sandwell/Smith]

Surface Relief and Volcanism

IBCAO_ver1_geo.i2: Arctic geographic bathymetry grid (version 1) [IBCAO] IBCAO_ver1.grd: Arctic stereographic bathymetry grid (version 1) [IBCAO] etopo5.i2: Global 5x5 arc min relief [NGDC] us_topo30s.i2: 30x30 arc sec topography for the continental US [NGDC] world_relief_1m.i2: Global 1x1 arc min relief, a blend of GTOPO30, ICBAO, TOPO6.2, & ETOPO5 [Geoware] topo.6.2.img: Sandwell/Smith 2x2 min Mercator grid of predicted bathymetry, version 6 [Sandwell/Smith]LIPS.1999.d: Polygon outlines for Large Igneous Privinces [UTIG] LIPS.1999.sym.d: Point locations for Large Igneous Privinces[UTIG] hotspots.d: List of global hotspots [UTIG] volcanos_of_the_world.txt: Global catalog of recent and active volcanism [Smithsonian]

Coastalines and Miscellaneous

gshhs_c.b: Global Self-consistent Hierarchical High-resolution Shoreline, crude [Wessel/Smith] gshhs_f.b: Global Self-consistent Hierarchical High-resolution Shoreline, full [Wessel/Smith] gshhs_h.b: Global Self-consistent Hierarchical High-resolution Shoreline, high [Wessel/Smith] gshhs_i.b: Global Self-consistent Hierarchical High-resolution Shoreline, int [Wessel/Smith] gshhs_l.b: Global Self-consistent Hierarchical High-resolution Shoreline, low [Wessel/Smith]

sedmap_interpolated.grd: Global Sediment thickness grid [Laske & Masters, 1997] UN_cities.dat: UN catalog of cities with 100,000+ inhabitants [UN] age_1.6.i2: Global grid with seafloor ages [Muller et al, 1998] world_heat.d: Global heat flow data [LDEO]

extract_candy

• extract_candy reads the Cande et al.[1989] magnetic lineations database and extracts a subset based on the given command line options. The output format is a multiple segment lon, lat file suitable for plotting with psxy.

extract_candy

• extract_candy [-Ffeature ] [ -Dprefix ] [ -L ] [ -Oocean ] [ -Pplate ] [ -Rwest/east/south/north ] [ -V ] [ > outfile ]

-F Specify the id of the tectonic feature to extract

-D Set prefix for individual output files

-L List all the features, oceans, and plates available.

-O Specify the ocean; only features in this ocean basin are output

-P Specify the plate; only features on this plate are output

gmt2007_ex08a

psbasemap -Jm0.020i -R0/360/-70/80 -K -B30f15 -X1i -Y1.7i -V > %filename%pscoast -J -R -K -G145/90/23 -O -Dh -X -Y -V >> %filename%extract_candy -F -V > candemag.dpsxy candemag.d -W0.01i/250/0/0 -R -J -M -K -O -V >> %filename%

Grids *.i2: The grids directory contains data files to be used with grdraster

The grids directory contains data files to be used with grdraster

grdraster - extract subregion from a binary raster and write a grd file

grdraster [ filenumber ] -Rwest/east/south/north[r] [ -Ggrdfilename ] [ -Ix_inc[m|c][/y_inc[m|c]] ] [ -Jparams ] [ -V ] [ -bo[s] ]

example: grdraster 3 –R234/294/24/50 -I0.5m –GUS_elevations.grd

grdraster: filenumberC:\gmt\share\dbase\grdraster.info

1 "ETOPO5 global topography" "m" -R0/359:55/-90/90 -I5m GG i 10 none etopo5.i2

2 "US Elevations from USGS" "m" -R234/294/24/50 -I0.5m PG i 0.3048 0 -9999 us_topo30s.i23 "Geosat/Seasat gravity from Haxby" "mGal" -R0/360/-90/90 -I5m GG i 0.1 0 none haxby5m_faa.i24 "Geosat/Seasat geoid from Haxby" "m" -R0/360/-90/90 -I5m GG i 0.001 0 none haxby5m_geoid.i25 "Sea floor age from Cande" "Ma" -R0/360/-90/90 -I5m PG i 0.1 0 -30000 cande5m_ages.i26 "Sea floor age from Muller" "Ma" -R0/360/-72/72 -I6m GG i 0.01 0 32767 scripps6m_ages.i27 "1=land, 0=sea bitmask" "T/F" -R0/360/-90/90 -I5m PG b 1

0 none landsea.bits#8 "Seasat geoid from J. Marsh" "m" -R0/359.875/-60/70 -I0.125 GG i 0.01 0 32765 marsh.geo#9 "Geosat gravity from Marks" "mGal" -R0/360/-72/-30 -I0.05/0.04

GG i 0.01 0 32767 geosat30.bin#10 "Seasat gravity from Haxby" "mGal" -R0:05/360/-71:55/72 -I5m

GG i 0.1 0 none haxby.bin

Attention: grdraster.info for Win4gmt1 "ETOPO5 global topography" "m" -R0/359:55/-90/90 -I5m

G i 1 0 none etopo5.i22 "US Elevations from USGS" "m" -R234/294/24/50 -I0.5m

P i 0.3048 0 -9999 us_topo30s.i23 "Geosat/Seasat gravity from Haxby" "mGal" -R0/360/-90/90 -I5m

G i 0.1 0 none haxby5m_faa.i24 "Geosat/Seasat geoid from Haxby" "m" -R0/360/-90/90 -I5m

G i 0.001 0 none haxby5m_geoid.i25 "Sea floor age from Cande" "Ma" -R0/360/-90/90 -I5m

P i 0.1 0 -30000 cande5m_ages.i26 "Sea floor age from Muller" "Ma" -R0/360/-72/72 -I6m

G i 0.01 0 32767 scripps6m_ages.i27 "1=land, 0=sea bitmask" "T/F" -R0/360/-90/90 -I5m

P b 1 0 none landsea.bits#8 "Seasat geoid from J. Marsh" "m" -R0/359.875/-60/70 -I0.125

G i 0.01 0 32765 marsh.geo#9 "Geosat gravity from Marks" "mGal" -R0/360/-72/-30 -

I0.05/0.04 G i 0.01 0 32767 geosat30.bin#10 "Seasat gravity from Haxby" "mGal" -R0:05/360/-71:55/72 -I5m

G i 0.1 0 none haxby.bin

!!!!!!!!!!!!

grdraster [ filenumber ] -Rwest/east/south/north[r] [ -Ggrdfilename ] [ -Ix_inc[m|c][/y_inc[m|c]] ] [ -Jparams ] [ -V ] [ -bo[s][n] ]

example: grdraster 1 -R0/360/-90/90 -I6m -Gage_1.6_i2.grd

Exercises and homeworks

1. Using grdraster to extract subregion of all binary rasters from Geoware and write the grd files

2. Drawing them with GMT commands