THE MOON S MARE CRISIUM FEATURES AN ANNULUS OF ELEVATED TOPOGRAPHY WHOSE INNER EDGE IS BOUNDED BY WRINKLE RIDGES. THE THRUST FAULTS UNDERLYING THESE RIDGES PENETRATE ~20 KM INTO THE LUNAR LITHOSPHERE. FREE-AIR GRAVITY AND DERIVED CRUSTAL THICKNESS DATA FROM NASA'S GRAVITY RECOVERY AND INTERIOR LABORATORY (GRAIL) MISSION SHOW THAT THE MASCON BELOW MARE CRISIUM IS STRUCTURALLY BOUND BY THESE FAULTS. FINITE-ELEMENT MODELS INDICATE THAT THE COMBINATION OF DOWNWARD MOVEMENT OF CRISIUM S SUPERISOSTATIC MANTLE PLUG AND THE UPWARD MOTION OF THE SURROUNDING SUB-ISOSTATIC COLLAR OF THICKENED CRUST IS RESPONSIBLE FOR THIS MECHANICAL ARRANGEMENT. CRISIUM IS NOT THE ONLY LUNAR MARE WITH THIS DISTINCTIVE TOPOGRAPHIC AND TECTONIC SIGNATURE. IN THIS TWO-YEAR PROJECT WE WILL USE GRAIL AND LUNAR RECONNAISSANCE ORBITER (LRO) DATA TO INVESTIGATE WHETHER DEEP-SEATED MASCON-BOUNDING THRUST FAULTS UNDERLIE SIX OTHER MARE-FILLED LUNAR BASINS: MARIA HUMORUM IMBRIUM MOSCOVIENSE NECTARIS ORIENTALE AND SERENITATIS. THIS PROJECT CONSISTS OF FOUR TASKS. IN THE FIRST WE WILL CHARACTERIZE THE SPATIAL DISTRIBUTION AND RELATIONSHIP WITH TOPOGRAPHY OF TECTONIC SHORTENING LANDFORMS WITHIN THESE SIX LUNAR MARIA THROUGH GIS-BASED MAPPING WITH PDS-HOSTED PHOTOGEOLOGICAL AND TOPOGRAPHIC DATA. IN TASK 2 WE WILL NEXT DETERMINE DISPLACEMENT DISTRIBUTIONS ALONG THOSE THRUST FAULTS THAT BOUND PORTIONS OF ELEVATED TERRAIN BY TAKING A SERIES OF TOPOGRAPHIC MEASUREMENTS ALONG EACH OF THEIR OVERLYING WRINKLE RIDGES. WE WILL ESTIMATE IN TASK 3 THE DEPTHS TO WHICH THOSE THRUST FAULTS WITH THE GREATEST DISPLACEMENTS (IDENTIFIED IN TASK 2) PENETRATE WITHIN THE SIX LUNAR MASCON BASINS. THIS TASK WILL EMPLOY COULOMB ELASTIC-DISLOCATION MODELING OF A TOTAL OF ABOUT 40 CASE-STUDY FAULTS FOR ALL SIX BASINS TO ELUCIDATE SUBSURFACE FAULT ARCHITECTURE BY MATCHING MODEL SOLUTIONS FOR SURFACE DISPLACEMENT WITH THE TASK 2-DERIVED TOPOGRAPHIC PROFILES. WE WILL THEN ASCERTAIN IN TASK 4 HOW THRUST FAULTS SPATIALLY RELATE TO THE MASCON WITHIN EACH BASIN THROUGH COMPARISON OF FAULT ARCHITECTURE WITH THE GEOMETRY OF EACH MASCON USING GRAIL-DERIVED CRUST MANTLE BOUNDARY MAPS. ESTABLISHING WHETHER THE FAULT ARCHITECTURE IN CRISIUM APPLIES TO OTHER LUNAR MASCONS IS IMPORTANT FOR UNDERSTANDING MASCON FORMATION AND DEVELOPMENT IN GENERAL AS THESE ENIGMATIC CRUSTAL STRUCTURES HAVE ALSO BEEN IDENTIFIED ON MARS AND ON MERCURY. BY COMBINING PHOTOGEOLOGICAL TOPOGRAPHIC AND GRAVITY DATA FROM THE LRO AND GRAIL SPACECRAFT THIS STUDY WILL ENHANCE THE SCIENTIFIC RETURN OF THOSE MISSIONS AND IS THEREFORE DIRECTLY RELEVANT TO LDAP.