diff --git a/src/main/java/gov/usgs/earthquake/nshmp/model/GridRuptureSet.java b/src/main/java/gov/usgs/earthquake/nshmp/model/GridRuptureSet.java
index 79d5b2d81a91968bcde525e2aec34a3bd70b4c3b..386299401dcda13350612cbf6156da52987e79ff 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/model/GridRuptureSet.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/model/GridRuptureSet.java
@@ -1039,9 +1039,11 @@ public class GridRuptureSet extends AbstractRuptureSet<PointSource> {
   private static final int PRECISION = 5;
   private static final double[] OFFSET_SCALE_10 = Sequences
       .arrayBuilder(-0.45, 0.45, 0.1)
+      .centered()
       .build();
   private static final double[] OFFSET_SCALE_4 = Sequences
       .arrayBuilder(-0.375, 0.375, 0.25)
+      .centered()
       .build();
 
   /*