updated ak sadigh interface

src/main/java/gov/usgs/earthquake/nshmp/gmm/SadighEtAl_1997.java

 package gov.usgs.earthquake.nshmp.gmm;
 
 import static gov.usgs.earthquake.nshmp.gmm.FaultStyle.REVERSE;
-import static gov.usgs.earthquake.nshmp.gmm.Gmm.YOUNGS_97_INTERFACE;
+import static gov.usgs.earthquake.nshmp.gmm.Gmm.GEOMATRIX_93_INTERFACE;
 import static gov.usgs.earthquake.nshmp.gmm.GmmInput.Field.MW;
 import static gov.usgs.earthquake.nshmp.gmm.GmmInput.Field.RAKE;
 import static gov.usgs.earthquake.nshmp.gmm.GmmInput.Field.RRUP;
@@ -191,11 +191,11 @@ public class SadighEtAl_1997 implements GroundMotionModel {
 
     static final String NAME = SadighEtAl_1997.NAME + " : Interface : Alaska";
 
-    private final YoungsEtAl_1997.Interface delegate;
+    private final Geomatrix_1993.Interface delegate;
 
     InterfaceAlaska(Imt imt) {
       super(imt);
-      delegate = (YoungsEtAl_1997.Interface) YOUNGS_97_INTERFACE.instance(imt);
+      delegate = (Geomatrix_1993.Interface) GEOMATRIX_93_INTERFACE.instance(imt);
     }
 
     @Override