UCVM muscal - Revision history

Scottcal: /* Delivered Model */

2026-04-27T21:01:47Z

Delivered Model

2026-04-27T21:01:21Z

Delivered Model

2026-04-27T20:47:12Z

Regional Models

2026-04-27T20:46:05Z

Local Models

2026-04-27T20:43:27Z

2026-04-24T22:06:15Z

Extended Model

2026-04-24T22:04:13Z

2026-04-24T21:08:59Z

Model Components

2026-04-24T18:14:07Z

2026-04-02T16:00:32Z

@@ Line 72: / Line 72: @@
 {|
-| [File:MUSCAL_region_extent.png|thumb|400px]
+| [[File:MUSCAL_region_extent.png|thumb|400px]]
 |}

@@ Line 65: / Line 65: @@
 == Delivered Model ==
-The final version of MUSCAL is delivered in netCDF format.  The dimensions of the model are <X x Y x Z>. Grid points have a spacing of <m>.  The model is interpolated using trilinear interpolation.
+The final version of MUSCAL is delivered in netCDF format.  The dimensions of the model in grid points are 1251 (lat) x 1301 (lon) x 210 (depth). Grid points have a spacing of 0.01 degrees in the horizontal; the depth is variable with denser sampling near the surface.  The model is interpolated using trilinear interpolation.
 Details about the model creation are provided in the paper and the [https://zenodo.org/records/19243477 Zenodo page].
@@ Line 71: / Line 71: @@
 Below is a plot of the 3D model extent.
+{|

@@ Line 22: / Line 22: @@
 <ul>
 <li>CCA-06</li>
-<li>CVM-H <what version?></li>
+<li>CVM-H v15.1.1</li>
 <li>CVM-S4.26</li>
 <li>Guo et al. (2024)</li>
@@ Line 31: / Line 31: @@
 <li>Fang et al. (2022)</li>
 <li>CVM-S4.26</li>
-<li>CVM-H <what version?></li>
+<li>CVM-H v15.1.1</li>
 <li>Berg et al. (2021)</li>
 </ul></li>

@@ Line 45: / Line 45: @@
 <li>Ridgecrest fault zone (Zhou et al. (2022))</li>
 <li>San Joaquin basin (Shaw & Plesch (2016))</li>
-<li>SFVM (Hirakawa & Aagaard (2022))</li>
+<li>SFCVM v21.1 (Hirakawa & Aagaard (2022))</li>
 </ul>

@@ Line 38: / Line 38: @@
 ==== Local Models ====
-Local high-resolution models that were evaluated for inclusion are:
+Below is a list of local high-resolution models that were evaluated for inclusion.
-<list>
 ==== Taper ====

← Older revision		Revision as of 22:06, 24 April 2026
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	\| [[File:USC_muscal_horiz_slice_z0.png\|thumb\|400px]]		\| [[File:USC_muscal_horiz_slice_z0.png\|thumb\|400px]]
	\|}		\|}
		+
		+	To solve this in a consistent and reproducible way, we will extend the MUSCAL model through UCVM. The initial plan is to use the following algorithm:
		+	<ol>
		+	<li>Query 3D MUSCAL model at a given point.</li>
		+	<li>If the model returns NaNs (indicating the point is beyond the bounds of the 3D model):
		+	<ol>
		+	<li>Query the 1D MUSCAL model (Te-Yang to provide this).</li>
		+	<li>Determine Vs30 from the USGS Global Vs30 model.</li>
		+	<li>Apply the Ely taper (LVT) to the top 300m.</li>
		+	</ol>
		+	</li>
		+	</ol>

@@ Line 49: / Line 49: @@
 == Delivered Model ==
-The final version of MUSCAL is delivered in netCDF format.  The dimensions of the model are <X x Y x Z>. Grid points have a spacing of <m>.  The model is intended to be interpolated using trilinear interpolation.
+The final version of MUSCAL is delivered in netCDF format.  The dimensions of the model are <X x Y x Z>. Grid points have a spacing of <m>.  The model is interpolated using trilinear interpolation.
-Details about the model creation are provided in <paper>.
+Details about the model creation are provided in the paper and the [https://zenodo.org/records/19243477 Zenodo page].
@@ Line 73: / Line 74: @@
 .5G
-   longitdue:1301 from -126 to -113
+   longitude:1301 from -126 to -113
    latitude:1251  from 31 to 43.5
    depth:671      from 0 to 100,000
@@ Line 182: / Line 183: @@
   [[FILE:MUSCAL_test_points_deep.final.txt]]
   [[FILE:MUSCAL_test_points_shallow.final.txt]]

@@ Line 7: / Line 7: @@
 === Model Components ===
-The model was built by starting with a base model (the CANVAS (Doody et al., 2023) tomography model) and then adding regional and local models where they improve the fit, based on M4 simulations.
+The model was built by starting with a base model (the CANVAS (Doody et al., 2023) tomography model).  Next, regional and local models are added where they improve the fit, based on M4 simulations.  These simulations were run to 1 Hz with topography using a minimum Vs of 450 m/s.  Finally, a spatially varying taper following the Ely approach is added.
 ==== Regional Models ====

@@ Line 1: / Line 1: @@
 This page describes the Multi-Scale CALifornia (MUSCAL) velocity model and its integration into UCVM.
-== MUSCAL overview ==
+== Model overview ==
 The MUSCAL Vp and Vs model was created by Te-Yang Yeh and Yehuda Ben-Zion in 2025-6 by starting with the CANVAS tomography model as a base and then integrating multiple regional and local high-resolution models.  Each submodel is evaluated to determine where it improves the fit through simulations of M4 historical events to 1 Hz, and then the overall model is updated where the submodel improves the fit.

← Older revision		Revision as of 16:00, 2 April 2026
Line 1:		Line 1:
−	== ~~about~~ MUSCAL ==	+	This page describes the Multi-Scale CALifornia (MUSCAL) velocity model and its integration into UCVM.
		+
		+	== MUSCAL overview ==
		+
		+	The MUSCAL Vp and Vs model was created by Te-Yang Yeh and Yehuda Ben-Zion in 2025-6 by starting with the CANVAS tomography model as a base and then integrating multiple regional and local high-resolution models. Each submodel is evaluated to determine where it improves the fit through simulations of M4 historical events to 1 Hz, and then the overall model is updated where the submodel improves the fit.

−	~~From Te-Yang Yeh and Yehuda Ben-Zion~~

−	The Multi-Scale CALifornia (MUSCAL) statewide Vp and Vs velocity models provide high-quality integrated description of seismic structures across the state. Starting with the CANVAS base model (Doody et al., 2023), MUSCAL incorporates multiple regional and local velocity datasets into a unified structure, capturing features ranging from broad crustal-mantle structures to fine-scale local anomalies such as sedimentary basins.

−	To ensure quality, the merged multi-scale models underwent a data-informed refinement process guided by simulations of small validation events. A key feature of MUSCAL is the inclusion of a locally optimized near-surface low-velocity taper (LVT), specifically designed to better represent under-resolved shallow structures and improve the accuracy of ground-motion predictions.