THE CENTRAL THEME OF THIS STUDY IS TO UNDERSTAND THE NATURE AND VARIATION OF LITHOSPHERIC PROPERTIES ACROSS THE CRUSTAL DICHOTOMY BOUNDARY OF MARS THE REASONS FOR DIFFERENCES IN THE LOCATION OF THE TOPOGRAPHIC/CRUSTAL DICHOTOMY AND THE MAGNETIC DICHOTOMY AND ALSO UNDERSTANDING THE SOURCE CHARACTERISTICS OF MAGNETIC SOURCES IN THE NORTHERN LOWLANDS. WE WILL ACCOMPLISH THIS BY DETERMINING ELASTIC AND CRUSTAL THICKNESS VARIATION ACROSS THE CRUSTAL DICHOTOMY USING A CONVOLUTION BASED TECHNIQUE FOR DETERMINING ELASTIC THICKNESS WHICH HAS NOT BEEN USED ON MARS. THE RESULTS FROM THIS STUDY ARE IMPORTANT BECAUSE DIFFERENT SPECTRAL TECHNIQUES (COHERENCE ADMITTANCE) HAVE DETERMINED SIGNIFICANTLY DIFFERENT ESTIMATES OF ELASTIC THICKNESS IN SEVERAL REGIONS OF MARS IN AND AROUND THE CRUSTAL DICHOTOMY BOUNDARY AS WELL AS THE NORTHERN LOWLANDS AND THE SOUTHERN HIGHLANDS. WE WILL ALSO ANALYZE LOW ALTITUDE MAVEN MAG DATA AND BUILD HIGH RESOLUTION MODELS OF THE MAGNETIC FIELD OF MARS THAT OTHER RESEARCHERS CAN USE. THE HIGH RESOLUTION MAGNETIC FIELD MODELS IN CONJUNCTION WITH INTERPRETATION METHODS (E.G. ANALYTIC SIGNAL THE EULER METHOD AND SPECTRAL DEPTH DETERMINATION TECHNIQUES) WILL ALLOW US TO UNDERSTAND BETTER THE NATURE AND CAUSE OF THE MAGNETIC DICHOTOMY. IN ADDITION DEPTHS AND SOURCE CHARACTERISTICS OF MAGNETIC SOURCES IN THE NORTHERN LOWLANDS WILL HELP DETERMINE THE SEDIMENTARY THICKNESS ABOVE THEM. MOREOVER MODELING MAGNETIZATION VECTOR OF SOURCES ACROSS THE MAGNETIC DICHOTOMY BOUNDARY AND ISOLATED SOURCES IN THE LOWLANDS WILL ALSO ALLOW US TO DETERMINE PALEOPOLES. FURTHERMORE ASSOCIATING MAGNETIC SOURCES WITH AGE PROVINCES WILL ALLOW US TO DETERMINE PERIODS OF MAGNETIC DYNAMO AND DETERMINING MAGNETIZATION VECTORS FROM SOURCES ACROSS THE DICHOTOMY WITH GEOLOGY AND AGES WILL ALLOW US TO UNDERSTAND BETTER THE TRUE POLAR WANDER OF MARS. RELEVANCE OF THE PROPOSED WORK TO MDAP PROGRAM: THE PROPOSED STUDY HAS SIGNIFICANT AMOUNT OF DATA ANALYSIS OF MAVEN MAG DATA FOR MODELING MAGNETIC FIELDS. IT ALSO USES MGS MAG AND MOLA TOPOGRAPHY DATA AND GRAVITY FIELDS FROM MRO IN ORDER TO STUDY VARIATIONS IN GEOLOGY DENSITY AND MAGNETIZATION OF SOURCES ELASTIC AND CRUSTAL THICKNESS ACROSS CRUSTAL AND MAGNETIC DICHOTOMY BOUNDARIES AND THEIR RELATIONSHIP. THE STUDY WILL ALSO INVESTIGATE IN DETAIL THE ISOLATED MAGNETIC SOURCES UNDER THE SEDIMENTARY COVER OF NORTHERN LOWLANDS. ONE OF THE GOALS OF MARS EXPLORATION PROGRAM ANALYSIS GROUP (MEPAG) CONCERNS UNDERSTANDING THE TECTONIC HISTORY AND LARGE-SCALE VERTICAL AND HORIZONTAL STRUCTURE OF THE CRUST INCLUDING THE CRUSTAL DICHOTOMY BOUNDARY. ANALYSIS AND INTERPRETATION OF MAGNETIC FIELD ANOMALY DATA WHEN APPROPRIATELY CO-ANALYZED WITH GEOLOGY GRAVITY AND TOPOGRAPHY AS PROPOSED IN THIS STUDY WILL INDEED IMPROVE OUR UNDERSTANDING OF THE PROCESSES OCCURRING WITHIN THE CRUST OF MARS. SINCE THE MAGNETIC FIELD FROM A DYNAMO SHIELDS PLANETS FROM HARMFUL SOLAR RADIATION ITS PRESENCE HAS IMPACT ON EVOLUTION OF LIFE. THUS UNDERSTANDING THE TIMING AND EVOLUTION OF THE MARS CORE FIELD DYNAMO AND ITS PAST ORIENTATIONS ARE ALSO RELEVANT TO HABITABILITY OF LIFE ON MARS A QUESTION SOUGHT AFTER BY MEPAG. FINALLY DETERMINATION OF CHANGES IN THE APPARENT POSITION OF ITS PLANETARY ROTATION AXIS (TRUE POLAR WANDER) IN THE EARLY HISTORY OF MARS WHEN THE CORE DYNAMO WAS ACTIVE ALSO HAS BEARING ON THE AREAS/CLIMATIC ZONES OF THE PLANET THAT MAY HAVE BEEN HABITABLE AND NOT HABITABLE DURING THE DYNAMO EPISODES. THUS BETTER UNDERSTANDING OF CHRONOSTRATIGRAPHIC SUB-UNITS WITHIN THE NOACHIAN AND THE DYNAMO EPISODES DURING THOSE PERIODS AS PROPOSED IN THIS STUDY IS ALSO IMPORTANT TO MARS RESEARCH AND MDAP