diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/AbrahamsonGulerce_2020.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/AbrahamsonGulerce_2020.java
index f8ad6f86897f267ecff47554baaad17ae94853dc..f46395255da7dec037316975d8b6564cf098a0d9 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/AbrahamsonGulerce_2020.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/AbrahamsonGulerce_2020.java
@@ -124,8 +124,8 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
 
   static final CoefficientContainer COEFFS = new CoefficientContainer("AG20.csv");
   static final CoefficientContainer COEFFS_PRVI = new CoefficientContainer("AG20_PRVI.csv");
-  static final CoefficientContainer COEFFS_AK_BIAS =
-      new CoefficientContainer("nga-sub-ak-interface-bias-corr.csv");
+  static final CoefficientContainer COEFFS_AK_ADJUSTED =
+      new CoefficientContainer("nga-sub-ak-interface-adjustment.csv");
 
   private static final double C1S = 7.5;
   private static final double C4 = 10.0;
@@ -147,8 +147,8 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
     final double a1Adj;
     final double ε; // epistemic uncertainty in mean
 
-    // USGS bias correction coefficient for Gobal interface models in Alaska
-    final double correctionAK;
+    // USGS data adjustment for NGA-Sub Gobal interface models in Alaska
+    final double ak_adjust;
 
     Coefficients(
         Imt imt,
@@ -215,11 +215,7 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
       vlin = coeffs.get("vlin");
       b = coeffs.get("b");
 
-      /*
-       * Average bias-correction for NGA-Subduction global interface models in
-       * Alaska NSHM.
-       */
-      correctionAK = COEFFS_AK_BIAS.get(imt).get("bias_ak");
+      ak_adjust = COEFFS_AK_ADJUSTED.get(imt).get("adj_ak");
     }
   }
 
@@ -253,8 +249,8 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
     return false;
   }
 
-  /* Apply USGS bias adjustment for Alaska */
-  boolean akBiasAdjusted() {
+  /* Apply USGS Alaska data adjustment to global interface. */
+  boolean akAdjusted() {
     return false;
   }
 
@@ -269,11 +265,11 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
     double pgaRock = 0.0;
     if (in.vs30 < coeffs.vlin) {
       pgaRock = exp(calcMean(
-          coeffsPGA, slab(), usgsBasin(), adjusted(), akBiasAdjusted(),
+          coeffsPGA, slab(), usgsBasin(), adjusted(), akAdjusted(),
           0.0, in.Mw, in.rRup, in.zTor, VS30_ROCK, Double.NaN));
     }
     double μ = calcMean(
-        coeffs, slab(), usgsBasin(), adjusted(), akBiasAdjusted(),
+        coeffs, slab(), usgsBasin(), adjusted(), akAdjusted(),
         pgaRock, in.Mw, in.rRup, in.zTor, in.vs30, in.z2p5);
 
     double σ = calcSigma(coeffs, coeffsPGA, pgaRock, in.rRup, in.vs30);
@@ -290,7 +286,7 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
       boolean slab,
       boolean usgsBasin,
       boolean adjust,
-      boolean akBiasAdjusted,
+      boolean akAdjusted,
       double pgaRock,
       double Mw,
       double rRup,
@@ -365,8 +361,8 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
       μ += c.a1Adj;
     }
 
-    if (!slab && akBiasAdjusted) {
-      μ += c.correctionAK;
+    if (!slab && akAdjusted) {
+      μ += c.ak_adjust;
     }
 
     return μ;
@@ -488,7 +484,7 @@ public abstract class AbrahamsonGulerce_2020 implements GroundMotionModel {
     }
 
     @Override
-    boolean akBiasAdjusted() {
+    boolean akAdjusted() {
       return true;
     }
   }
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
index 33832fe6973e82bfbd8246f3a7a9436e0e2af139..e3a7445338d98f2b56f395ae605a3794a1e24f87 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
@@ -147,8 +147,8 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
 
   static final CoefficientContainer COEFFS = new CoefficientContainer("KBCG20.csv");
   static final CoefficientContainer COEFFS_PRVI = new CoefficientContainer("KBCG20_PRVI.csv");
-  static final CoefficientContainer COEFFS_AK_BIAS =
-      new CoefficientContainer("nga-sub-ak-interface-bias-corr.csv");
+  static final CoefficientContainer COEFFS_AK_ADJUSTED =
+      new CoefficientContainer("nga-sub-ak-interface-adjustment.csv");
 
   private static final double δM = 0.1; // p. 20
   private static final double MREF = 6.0; // p. 20
@@ -188,8 +188,8 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
     final double zBreak; // dzb_if dzb_slab
     final double zRef;
 
-    // USGS bias correction coefficient for Gobal interface models in Alaska
-    final double correctionAK;
+    // USGS data adjustment for NGA-Sub Gobal interface models in Alaska
+    final double ak_adjust;
 
     Coefficients(
         Imt imt,
@@ -256,11 +256,7 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
       Ï„ = coeffs.get("tau");
       ρ = coeffs.get("rho");
 
-      /*
-       * Average bias-correction for NGA-Subduction global interface models in
-       * Alaska NSHM.
-       */
-      correctionAK = COEFFS_AK_BIAS.get(imt).get("bias_ak");
+      ak_adjust = COEFFS_AK_ADJUSTED.get(imt).get("adj_ak");
     }
   }
 
@@ -306,8 +302,8 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
     return false;
   }
 
-  /* Apply USGS bias adjustment for Alaska */
-  boolean akBiasAdjusted() {
+  /* Apply USGS Alaska data adjustment to global interface. */
+  boolean akAdjusted() {
     return false;
   }
 
@@ -315,17 +311,17 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
   public LogicTree<GroundMotion> calc(GmmInput in) {
 
     double pgaRef = exp(calcPgaRef(
-        coeffsPGA, slab(), akBiasAdjusted(),
+        coeffsPGA, slab(), akAdjusted(),
         in.Mw, in.rRup, in.zTor));
 
     double μ = calcMean(
-        coeffs, slab(), usgsBasin(), seattle(), m9(), akBiasAdjusted(),
+        coeffs, slab(), usgsBasin(), seattle(), m9(), akAdjusted(),
         in.Mw, in.rRup, in.zTor, in.vs30, in.z2p5, pgaRef);
 
     // short periods can't be lower than PGA
     if (coeffs.imt.isSA() && coeffs.imt.period() <= 0.1) {
       double μPga = calcMean(
-          coeffsPGA, slab(), usgsBasin(), seattle(), m9(), akBiasAdjusted(),
+          coeffsPGA, slab(), usgsBasin(), seattle(), m9(), akAdjusted(),
           in.Mw, in.rRup, in.zTor, in.vs30, in.z2p5, pgaRef);
       μ = max(μ, μPga);
     }
@@ -347,7 +343,7 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
   private static double calcPgaRef(
       Coefficients c,
       boolean slab,
-      boolean akBiasAdjusted,
+      boolean akAdjusted,
       double Mw,
       double rRup,
       double zTor) {
@@ -359,8 +355,8 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
     double fSite = siteAmpTerm(c, VSROCK, 0);
     double μ = c.θ1 + fMag + fGeom + fDepth + fAtten + fSite;
 
-    if (!slab && akBiasAdjusted) {
-      μ += c.correctionAK;
+    if (!slab && akAdjusted) {
+      μ += c.ak_adjust;
     }
 
     return μ;
@@ -372,7 +368,7 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
       boolean usgsBasin,
       boolean seattle,
       boolean m9,
-      boolean akBiasAdjusted,
+      boolean akAdjusted,
       double Mw,
       double rRup,
       double zTor,
@@ -388,8 +384,8 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
     double fBasin = basinTerm(c, vs30, z2p5, slab, usgsBasin, seattle, m9);
     double μ = c.θ1 + fMag + fGeom + fDepth + fAtten + fSite + fBasin;
 
-    if (!slab && akBiasAdjusted) {
-      μ += c.correctionAK;
+    if (!slab && akAdjusted) {
+      μ += c.ak_adjust;
     }
 
     return μ;
@@ -611,7 +607,7 @@ public abstract class KuehnEtAl_2020 implements GroundMotionModel {
     }
 
     @Override
-    boolean akBiasAdjusted() {
+    boolean akAdjusted() {
       return true;
     }
   }
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/ParkerEtAl_2020.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/ParkerEtAl_2020.java
index db5b4f48cac11443ceb7ca6c6f6193bc9e102063..d6bbcf220fc0b2d1773b8d406c778bb96fa08fd9 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/ParkerEtAl_2020.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/ParkerEtAl_2020.java
@@ -117,7 +117,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
 
   static final CoefficientContainer COEFFS_INTERFACE;
   static final CoefficientContainer COEFFS_SLAB;
-  static final CoefficientContainer COEFFS_AK_BIAS;
+  static final CoefficientContainer COEFFS_AK_ADJUSTED;
   static final CoefficientContainer COEFFS_PRVI;
 
   static {
@@ -128,7 +128,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
      */
     COEFFS_INTERFACE = new CoefficientContainer("PSBAH20_interface.csv");
     COEFFS_SLAB = new CoefficientContainer("PSBAH20_slab.csv");
-    COEFFS_AK_BIAS = new CoefficientContainer("nga-sub-ak-interface-bias-corr.csv");
+    COEFFS_AK_ADJUSTED = new CoefficientContainer("nga-sub-ak-interface-adjustment.csv");
     COEFFS_PRVI = new CoefficientContainer("PSBAH20_PRVI.csv");
   }
 
@@ -162,8 +162,8 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
     final double Ï„, Ï•21, Ï•22, Ï•2v;
     final double σε1, σε2, t1, t2;
 
-    // USGS bias correction coefficient for Gobal interface models in Alaska
-    final double correctionAK;
+    // USGS data adjustment for NGA-Sub Gobal interface models in Alaska
+    final double ak_adjust;
 
     // inlined
     // final double b4, v1, vRef;
@@ -259,11 +259,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
         throw new IllegalArgumentException("Subduction zone [" + zone + "] not supported");
       }
 
-      /*
-       * Average bias-correction for NGA-Subduction global interface models in
-       * Alaska NSHM.
-       */
-      correctionAK = COEFFS_AK_BIAS.get(imt).get("bias_ak");
+      ak_adjust = COEFFS_AK_ADJUSTED.get(imt).get("adj_ak");
     }
   }
 
@@ -295,8 +291,8 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
     return false;
   }
 
-  /* Apply USGS bias adjustment for Alaska */
-  boolean akBiasAdjusted() {
+  /* Apply USGS Alaska data adjustment to global interface. */
+  boolean akAdjusted() {
     return false;
   }
 
@@ -304,10 +300,10 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
   public LogicTree<GroundMotion> calc(GmmInput in) {
 
     double pgaRef = exp(calcMean(
-        coeffsPGA, slab(), akBiasAdjusted(), in));
+        coeffsPGA, slab(), akAdjusted(), in));
 
     double μ = calcMean(
-        coeffs, slab(), usgsBasin(), m9(), akBiasAdjusted(), pgaRef, in);
+        coeffs, slab(), usgsBasin(), m9(), akAdjusted(), pgaRef, in);
 
     double Ï•Total = phiTotal(coeffs, in.rRup, in.vs30);
     double σ = Maths.hypot(coeffs.τ, ϕTotal);
@@ -324,7 +320,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
   private static double calcMean(
       Coefficients c,
       boolean slab,
-      boolean akBiasAdjusted,
+      boolean akAdjusted,
       GmmInput in) {
 
     double h = nearSourceSaturation(in.Mw, c.mc, slab);
@@ -333,8 +329,8 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
     double Fd = depthTerm(c, slab, in.zTor);
     double μ = c.c0 + Fp + Fm + Fd;
 
-    if (!slab && akBiasAdjusted) {
-      μ += c.correctionAK;
+    if (!slab && akAdjusted) {
+      μ += c.ak_adjust;
     }
 
     return μ;
@@ -346,7 +342,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
       boolean slab,
       boolean usgsBasin,
       boolean m9,
-      boolean akBiasAdjusted,
+      boolean akAdjusted,
       double pgaRef,
       GmmInput in) {
 
@@ -363,8 +359,8 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
 
     double μ = c.c0 + Fp + Fm + Fd + Fs;
 
-    if (!slab && akBiasAdjusted) {
-      μ += c.correctionAK;
+    if (!slab && akAdjusted) {
+      μ += c.ak_adjust;
     }
 
     return μ;
@@ -600,7 +596,7 @@ public abstract class ParkerEtAl_2020 implements GroundMotionModel {
     }
 
     @Override
-    boolean akBiasAdjusted() {
+    boolean akAdjusted() {
       return true;
     }
   }
diff --git a/src/main/resources/gmm/coeffs/nga-sub-ak-interface-bias-corr.csv b/src/main/resources/gmm/coeffs/nga-sub-ak-interface-adjustment.csv
similarity index 96%
rename from src/main/resources/gmm/coeffs/nga-sub-ak-interface-bias-corr.csv
rename to src/main/resources/gmm/coeffs/nga-sub-ak-interface-adjustment.csv
index 9879ac02c6a803b4719891c69cc65c36f2829137..a485a32601e6eeb69690cdc0e615db149e252c61 100644
--- a/src/main/resources/gmm/coeffs/nga-sub-ak-interface-bias-corr.csv
+++ b/src/main/resources/gmm/coeffs/nga-sub-ak-interface-adjustment.csv
@@ -1,4 +1,4 @@
-T,bias_ak
+T,adj_ak
 PGA,-0.26167
 PGV,0.00833
 0.01,-0.30351