Lin Thurber CVM - Revision history

Maechlin at 17:42, 19 April 2011

2011-04-19T17:42:42Z

Patrices at 02:31, 12 April 2011

2011-04-12T02:31:14Z

Patrices at 22:25, 11 April 2011

2011-04-11T22:25:24Z

Patrices at 18:12, 11 April 2011

2011-04-11T18:12:28Z

Patrices at 18:02, 11 April 2011

2011-04-11T18:02:15Z

Patrices at 17:53, 11 April 2011

2011-04-11T17:53:07Z

Patrices at 05:31, 9 April 2011

2011-04-09T05:31:29Z

Patrices at 05:30, 9 April 2011

2011-04-09T05:30:07Z

Patrices at 05:26, 9 April 2011

2011-04-09T05:26:52Z

Patrices at 05:16, 9 April 2011

2011-04-09T05:16:54Z

← Older revision		Revision as of 17:42, 19 April 2011
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	#'''Lin, G., C. H. Thurber, H. Zhang, E. Hauksson, P. Shearer, F. Waldhauser, T. M. Brocher, and J. Hardebeck''' (2010), A California statewide three-dimensional seismic velocity model from both absolute and differential Times, Bull. Seism. Soc. Am., 100, in press.		#'''Lin, G., C. H. Thurber, H. Zhang, E. Hauksson, P. Shearer, F. Waldhauser, T. M. Brocher, and J. Hardebeck''' (2010), A California statewide three-dimensional seismic velocity model from both absolute and differential Times, Bull. Seism. Soc. Am., 100, in press.
	#'''Ludwig, W. J., J. E. Nafe, and C. L. Drake''' (1970), Seismic refraction, in New Concepts of Sea Floor Evolution, The Sea: Ideas and Observations on Progress in the Study of the Seas, vol. 4, edited by A. E. Maxwell, pp. 53-84, Wiley-Interscience, New York.		#'''Ludwig, W. J., J. E. Nafe, and C. L. Drake''' (1970), Seismic refraction, in New Concepts of Sea Floor Evolution, The Sea: Ideas and Observations on Progress in the Study of the Seas, vol. 4, edited by A. E. Maxwell, pp. 53-84, Wiley-Interscience, New York.
		+
		+	== Related Entries ==
		+	*[[UCVM]]
		+	*[[CyberShake]]
		+
		+	== See Also ==
		+	*[[Main Page]]
		+	*[http://www.scec.org SCEC Home]

@@ Line 35: / Line 35: @@
-== Vp Model ==
+== Material Properties ==
 The Vp model is a 1320km x 600km  x 46km grid with spacing of 10.0km along the x-y plane and variable spacing along the z axis. The z coordinate is measured as km offset from MSL, positive down. The z values contained in the model are:
@@ Line 52: / Line 57: @@
-== Vs Model ==
+=== Vs Values ===
 The Vs model is a 1320km x 600km grid with spacing of 30.0km along the x-y plane and the same z-axis organization as the Vp model. The model is published as a space-delimited text file, available from [http://www.rsmas.miami.edu/personal/glin/Statewide_files/out.vs Vs Model]. The model file format is the same as Vp model. The UCVM API reads in this file directly without changes. The Vs at a particular lon,lat coordinate is determined by trilinear interpolation of the surrounding 8 points.
-== Density Model ==
+=== Density Values ===
 The original model does not provide density values. We adopt the Nafe-Drake scaling relationship to compute density from Vp (Ludwig et al., 1970; Brocher , 2005):

← Older revision		Revision as of 22:25, 11 April 2011
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	These preliminary maps are based on querying the model at a depth of 0.0m. The low velocities in the Tahoe region are due to interactions of the DEM with the upper two layers of the Vp/Vs models. Here, the high elevations cause material properties to be pulled from the -1.0km model layer which seems to have very low velocities for most of the state. To the west in the central valley, lower elevations cause material properties to be pulled from the 1.0km model layer.		These preliminary maps are based on querying the model at a depth of 0.0m. The low velocities in the Tahoe region are due to interactions of the DEM with the upper two layers of the Vp/Vs models. Here, the high elevations cause material properties to be pulled from the -1.0km model layer which seems to have very low velocities for most of the state. To the west in the central valley, lower elevations cause material properties to be pulled from the 1.0km model layer.

		+	Additional profile and map plots are available at [http://earth.usc.edu/~patrices/ucvm/lin-thurber/index.html Lin-Thurber Plots].

	= References =		= References =

@@ Line 25: / Line 25: @@
 </pre>
-The region is sized 1320km x 600km. The actual number of grid points along each dimension is dependant on the resolution of the Vp/Vs model. These are described below.
+The region is sized 1320km x 600km. The DEM, Vp, and Vs models all use this projection. The actual number of grid points along each dimension is dependant on the resolution of the particular DEM/Vp/Vs model. These are described below.
@@ Line 49: / Line 49: @@
 </pre>
-The UCVM API reads in this file directly without changes.
+The UCVM API reads in this file directly without changes. The Vp at a particular lon,lat coordinate is determined by trilinear interpolation of the surrounding 8 points.
 == Vs Model ==
-The Vs model is a 1320km x 600km grid with spacing of 30.0km along the x-y plane and the same z-axis organization as the Vp model. The model is published as a space-delimited text file, available from [http://www.rsmas.miami.edu/personal/glin/Statewide_files/out.vs Vs Model].
+The Vs model is a 1320km x 600km grid with spacing of 30.0km along the x-y plane and the same z-axis organization as the Vp model. The model is published as a space-delimited text file, available from [http://www.rsmas.miami.edu/personal/glin/Statewide_files/out.vs Vs Model]. The model file format is the same as Vp model. The UCVM API reads in this file directly without changes. The Vs at a particular lon,lat coordinate is determined by trilinear interpolation of the surrounding 8 points.

← Older revision		Revision as of 18:02, 11 April 2011
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	In order to query this model by depth, a state-wide DEM was constructed. The DEM is a 1320km x 600km grid with spacing of 1.0km. It was compiled by combining the NED 1 arcsec (DEM) and ETOPO2 2' (Bathymetric) datasets. The elevation at a particular lon,lat coordinate is computed by bilinear interpolation of the surrounding four points in the grid.		In order to query this model by depth, a state-wide DEM was constructed. The DEM is a 1320km x 600km grid with spacing of 1.0km. It was compiled by combining the NED 1 arcsec (DEM) and ETOPO2 2' (Bathymetric) datasets. The elevation at a particular lon,lat coordinate is computed by bilinear interpolation of the surrounding four points in the grid.
		+
		+	In UCVM, depth is defined as the offset from the free surface (ground-air interface, ground-water interface), positive down. Negative depths are not supported.

@@ Line 6: / Line 6: @@
-= Model Description =
+= Original Model =
 Recently, we determined the seismic velocity model of the California crust and uppermost mantle using a regional-scale double-difference tomography algorithm. Our model is the first 3D seismic velocity model for the entire state of California based on local and regional arrival time data that has ever been developed. It has improved areal coverage compared to the previous northern and southern California models, and extends to greater depth due to the inclusion of substantial data at large epicentral distances.
 *[http://www.rsmas.miami.edu/personal/glin/Statewide.html Lin Web Page With Original Model].

@@ Line 34: / Line 34: @@
 The Vp model is a 1320km x 600km  x 46km grid with spacing of 10.0km along the x-y plane and variable spacing along the z axis. The z coordinate is measured as km offset from MSL, positive down. The z values contained in the model are:
 <pre>
--1.0, 1.0, 4.0, 8.0, 14.0, 20.0, 27.0, 35.0, 46.0
+-1.0, 1.0, 4.0, 8.0, 14.0, 20.0, 27.0, 35.0, 45.0
 </pre>

← Older revision		Revision as of 05:30, 9 April 2011
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	\|}		\|}

−	These preliminary maps are based on querying the model at a depth of 0.0m.	+	These preliminary maps are based on querying the model at a depth of 0.0m. The low velocities in the Tahoe region are due to interactions of the DEM with the upper two layers of the Vp/Vs models. Here, the high elevations cause material properties to be pulled from the -1.0km model layer which seems to have very low velocities for most of the state. To the west in the central valley, lower elevations cause material properties to be pulled from the 1.0km model layer.

@@ Line 72: / Line 72: @@
 |-
 | [[Image:Lin_Thurber_Vp.png|256px|thumb|Lin Thurber CVM Vp Map at 0km Depth]]
-| [[Image:Lin_Thurber_Vs.png|256px|thumb|Lin Thurber CVM Vs Maps at 0km Depth]]
+| [[Image:Lin_Thurber_Vs.png|256px|thumb|Lin Thurber CVM Vs Map at 0km Depth]]
 |}

← Older revision		Revision as of 05:16, 9 April 2011
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	[[Image:MapviewP_statewide.png‎ \|256px\|thumb\|right\|Map views of the P-wave velocity model at 1 and 4 km depth slices. Pink dots represent relocated earthquakes. Black lines denote coast line and lakes, gray lines rivers and surface traces of mapped faults. The white contours enclose the areas where the derivative weight sum is greater than 50 (Image Credit: Guoqing Lin]]		[[Image:MapviewP_statewide.png‎ \|256px\|thumb\|right\|Map views of the P-wave velocity model at 1 and 4 km depth slices. Pink dots represent relocated earthquakes. Black lines denote coast line and lakes, gray lines rivers and surface traces of mapped faults. The white contours enclose the areas where the derivative weight sum is greater than 50 (Image Credit: Guoqing Lin]]
		+

	= Model Description =		= Model Description =