diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/UsgsPrviBackbone2025.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/UsgsPrviBackbone2025.java
index aa37b1eb46e6a880fecb67909602876cc3b298dc..757b38c5423725896e716f8693ea55541fabe0b1 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/UsgsPrviBackbone2025.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/UsgsPrviBackbone2025.java
@@ -243,7 +243,7 @@ public abstract class UsgsPrviBackbone2025 implements GroundMotionModel {
         CB_14_PRVI, 0.25,
         CY_14_PRVI, 0.25);
 
-    private final AbrahamsonEtAl_2014 σPgaGmm;
+    private final AbrahamsonEtAl_2014 σSaGmm;
 
     ActiveCrust(Imt imt) {
       this(imt, NAME);
@@ -255,7 +255,7 @@ public abstract class UsgsPrviBackbone2025 implements GroundMotionModel {
 
     ActiveCrust(Imt imt, String name, Map<Gmm, Double> gmms) {
       super(imt, name, gmms, getPrviEpi(ACTIVE_CRUST, imt));
-      this.σPgaGmm = (AbrahamsonEtAl_2014) Gmm.ASK_14_BASE.instance(imt);
+      this.σSaGmm = (AbrahamsonEtAl_2014) Gmm.ASK_14_BASE.instance(imt);
     }
 
     @Override
@@ -286,7 +286,7 @@ public abstract class UsgsPrviBackbone2025 implements GroundMotionModel {
           .z1p0(Double.NaN)
           .build();
 
-      return Math.exp(σPgaGmm.calc(inRock).get(0).value().mean());
+      return Math.exp(σSaGmm.calc(inRock).get(0).value().mean());
     }
 
     // active crust tau