diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
index 695b88661e6f41219cf43df380b8e6247f17ef70..bb2b45a9eac4bf3742bb8cd6ae221698cc2286f3 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
@@ -61,7 +61,7 @@ public enum Gmm {
 
   MA_05(
       MotazedianAtkinson_2005.Usgs.class,
-      MotazedianAtkinson_2005.NAME,
+      MotazedianAtkinson_2005.Usgs.NAME,
       MotazedianAtkinson_2005.COEFFS,
       MotazedianAtkinson_2005.CONSTRAINTS),
 
@@ -1692,6 +1692,8 @@ public enum Gmm {
             AG_20_GLOBAL_INTERFACE,
             KBCG_20_GLOBAL_INTERFACE,
             PSBAH_20_GLOBAL_INTERFACE,
+            MA_05_BASE,
+            MA_05,
             GOMEZ_22_NONCRUSTAL)),
 
     PRVI_25_SLAB(
@@ -1700,6 +1702,8 @@ public enum Gmm {
             AG_20_GLOBAL_SLAB,
             KBCG_20_GLOBAL_SLAB,
             PSBAH_20_GLOBAL_SLAB,
+            MA_05_BASE,
+            MA_05,
             GOMEZ_22_NONCRUSTAL)),
 
     CEUS_14_STABLE_CRUST(
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/MotazedianAtkinson_2005.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/MotazedianAtkinson_2005.java
index 5f8d1e19b56027af98bedcf86e113c8533cd84ee..d5798608eba1e7c8cc14d0ad24a2a812cf3bdf59 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/MotazedianAtkinson_2005.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/MotazedianAtkinson_2005.java
@@ -79,7 +79,7 @@ import gov.usgs.earthquake.nshmp.tree.LogicTree;
  */
 public class MotazedianAtkinson_2005 implements GroundMotionModel {
 
-  static final String NAME = "Motazedian & Atkinson (2005) BETA";
+  static final String NAME = "Motazedian & Atkinson (2005) BASE BETA";
 
   static final Constraints CONSTRAINTS = Constraints.builder()
       .set(MW, Range.closed(4.0, 9.5))
@@ -213,6 +213,8 @@ public class MotazedianAtkinson_2005 implements GroundMotionModel {
    */
   static class Usgs extends MotazedianAtkinson_2005 {
 
+    static final String NAME = "Motazedian & Atkinson (2005) BETA";
+
     /* MA05 non-MPRS IMTs. */
     private static final Map<Imt, Range<Imt>> INTERPOLATED_SITE_IMTS =
         new EnumMap<>(Map.of(