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 f21baae823cff9967af8e250e936746ac0ce8314..d5c32c6e36b8a49a0422513580cc5c2e18e3c2ec 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
@@ -53,6 +53,12 @@ public enum Gmm {
    * argument.
    */
 
+  MA_03(
+      MotazedianAtkinson_2003.class,
+      MotazedianAtkinson_2003.NAME,
+      MotazedianAtkinson_2003.COEFFS,
+      MotazedianAtkinson_2003.CONSTRAINTS),
+
   MA_05_BASE(
       MotazedianAtkinson_2005.class,
       MotazedianAtkinson_2005.NAME,
@@ -401,6 +407,20 @@ public enum Gmm {
       SadighEtAl_1997.COEFFS_BC_HI,
       SadighEtAl_1997.CONSTRAINTS),
 
+  /** @see SadighEtAl_1997 */
+  SADIGH_97_PRVI_INTERFACE(
+      SadighEtAl_1997.PrviInterface.class,
+      SadighEtAl_1997.PrviInterface.NAME,
+      SadighEtAl_1997.COEFFS_BC_HI,
+      SadighEtAl_1997.CONSTRAINTS),
+
+  /* PRVI 2003 */
+  SPUDICH_99_PRVI(
+      SpudichEtAl_1999_PRVI.class,
+      SpudichEtAl_1999_PRVI.NAME,
+      SpudichEtAl_1999_PRVI.COEFFS,
+      SpudichEtAl_1999_PRVI.CONSTRAINTS),
+
   /* Subduction Interface and Slab WUS 2008 2014 2018, AK 2007 */
 
   /** @see AtkinsonBoore_2003 */
@@ -1563,13 +1583,6 @@ public enum Gmm {
       UsgsPrviBackbone2025.COEFFS_SIGMA_SUBDUCTION,
       UsgsPrviBackbone2025.SlabTotal.CONSTRAINTS),
 
-  /* PRVI 2003 */
-  SEA99_PRVI(
-      SpudichEtAl_1999_PRVI.class,
-      SpudichEtAl_1999_PRVI.NAME,
-      SpudichEtAl_1999_PRVI.COEFFS,
-      SpudichEtAl_1999_PRVI.CONSTRAINTS),
-
   /* Combined: must be declared after any dependent models above. */
 
   /** 2021 Hawaii weight-averaged GMM for deep earthquakes. */
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/SadighEtAl_1997.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/SadighEtAl_1997.java
index 2d62b5a66805b06e260c398c4c7be2c7951b82d5..dc94ce348847db70fe0665819c073582b84e5573 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/SadighEtAl_1997.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/SadighEtAl_1997.java
@@ -254,4 +254,46 @@ public class SadighEtAl_1997 implements GroundMotionModel {
     }
   }
 
+  /*
+   * Custom version of model for use with the 2003 PRVI NSHM where the GMM logic
+   * tree changes from 50/50 YOUNGS_97_INTERFACE/SADIGH_97 to 100%
+   * YOUNGS_97_INTERFACE at 58km (out to 1000km). This variant returns ground
+   * motions for YOUNGS_97_INTERFACE when rRup > 58 km, obviating the need for a
+   * distance dependent GMM logic tree.
+   */
+  static final class PrviInterface extends SadighEtAl_1997 {
+
+    static final String NAME = SadighEtAl_1997.NAME + " : PRVI : Interface";
+
+    private final Geomatrix_1993.Interface delegate;
+
+    PrviInterface(Imt imt) {
+      super(imt);
+      delegate = (Geomatrix_1993.Interface) GEOMATRIX_93_INTERFACE.instance(imt);
+    }
+
+    @Override
+    public final LogicTree<GroundMotion> calc(GmmInput in) {
+      if (in.rRup > 58.0) {
+        return delegate.calc(in);
+      }
+      return super.calc(in);
+    }
+
+    @Override
+    double calcRockMean(
+        Coefficients c,
+        double Mw,
+        double rRup,
+        FaultStyle style) {
+
+      /*
+       * We know interface events have a reverse rake. The Sadigh GMM as
+       * published includes a scale factor for reverse events, but it is not
+       * applied in the PRVI 2003 NSHM on the megathrust so we subtract it here.
+       */
+      return super.calcRockMean(c, Mw, rRup, style) - 0.18232;
+    }
+  }
+
 }