Index: /issm/trunk-jpl/src/c/classes/FemModel.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/FemModel.cpp	(revision 18034)
+++ /issm/trunk-jpl/src/c/classes/FemModel.cpp	(revision 18035)
@@ -1240,5 +1240,5 @@
 			gauss->GaussPoint(ig);
 
-			J +=0.5*(thickness*thickness - thicknessobs*thicknessobs)*weight*Jdet*gauss->weight;
+			J +=0.5*(thickness*thickness - thicknessobs*thicknessobs)*(thickness*thickness - thicknessobs*thicknessobs)*weight*Jdet*gauss->weight;
 		}