RAPID INCREASES IN THE VOLUME OF SPACE GEODETIC OBSERVATIONS IN PARTICULAR INTERFEROMETRIC SYNTHETIC APERTURE RADAR (INSAR) AS WELL AS GLOBAL POSITIONING SYSTEM (GPS) DATA HAVE LED TO DRAMATIC IMPROVEMENTS IN OUR ABILITY TO MEASURE SUBTLE INTERSEISMIC BUILDUP OF STRAIN ON SEISMOGENIC FAULTS COSEISMIC DEFORMATION AND POST SEISMIC TRANSIENTS. THESE OBSERVATIONS ARE INFORMING INCREASINGLY SOPHISTICATED MODELS OF EARTHQUAKE CYCLE THAT INCORPORATE REALISTIC EARTH STRUCTURES LABORATORY-DERIVED CONSTITUTIVE LAWS FOR FRICTION AND UCTILE OW IN THE BULK AND INTERACTIONS BETWEEN VARIOUS MECHANISMS OF TIME-DEPENDENT DEFORMATION. BOTH THE DATA PROCESSING AND INVERSE MODELING ARE COMPUTATIONALLY DEMANDING FOR FORTUNATELY READILY AVAIL THEMSELVES FOR PARALLEL EXECUTION. THIS PROPOSAL IS FOCUSED ON DEVELOPMENT AND APPLICATION OF ROBUST AND COMPUTATIONALLY ECIENT TECHNIQUES FOR PROCESSING ANALYSIS AND INTERPRETATION OF LARGE SETS OF INSAR DATA TO STUDY THE AFTERMATH OF THREE MAJOR EARTHQUAKES THAT OCCURRED ON THE BOUNDARIES OF THE TIBETAN PLATEAU OVER THE LAST 20 YEARS. WE ARE REQUESTING ACCESS TO THE HIGH-END COMPUTING (HEC) RESOURCES AT NASA TO GENERATE MULTI-YEAR TIME SERIES OF SURFACE DEFORMATION IN THE RESPECTIVE EARTHQUAKE AREAS USING RICH CATALOGS OF INSAR DATA FROM ENVISAT ALOS SENTINEL-1 AND ALOS-2 MISSIONS. THESE DATA WILL BE ASSIMILATED USING STATE-OF-THE-ART MODELS OF TIME-DEPENDENT THREE-DIMENSIONAL DEFORMATION THAT WILL PROVIDE IMPORTANT CONSTRAINTS ON THE EECTIVE RHEOLOGY OF THE EARTH S CRUST IN AN ACTIVE COLLISION ZONE AND HELP DISCRIMINATE BETWEEN PROPOSED MODELS OF THE LONG-TERM EVOLUTION OF THE TIBETAN PLATEAU. THE PROPOSED RESEARCH IS DIRECTLY RELEVANT TO THE EARTH SURFACE AND INTERIOR (ESI) GENERAL FOCUS AREA (ASSESSING MITIGATING AND FORECASTING THE NATURAL HAZARDS THAT AECT SOCIETY THROUGH UNDERSTANDING THE EARTH S SURFACE AND INTERIOR STRUCTURE AND DYNAMICS) AS WELL AS THE SPECIFIC FOCUS OF THE ROSES-2017 SOLICITATION (UTILIZATION OF COMPUTATIONAL RESOURCES THROUGH NASA S HIGH-END COMPUTING PROGRAM TO ANSWER SPECIFIC QUESTIONS IN SOLID-EARTH SCIENCE THROUGH AUTOMATED PROCESSING OF LARGE DATASETS AND ADVANCED ANALYSIS AND SIMULATION). IN PARTICULAR THE PROPOSED WORK WILL RELY ON THE USE OF REMOTE SENSING DATA AND PROMOTE THE DEVELOPMENT OF GEOPHYSICAL MODELS TECHNIQUES AND ANALYSIS SYSTEMS THAT WILL ADVANCE GEODETIC PRODUCTS RELEVANT TO MITIGATION OF GEOHAZARDS. RESULTS OF OUR DATA ANALYSIS WILL BE USED TO ADDRESS A NUMBER OF OUTSTANDING PROBLEMS INCLUDING THE MECHANISMS AND TIME SCALES OF STRESS AND STRAIN TRANSFER IN THE SEISMOGENIC CRUST TIME-DEPENDENT RESPONSE OF THE EARTH CRUST AND MANTLE TO MAJOR EARTHQUAKES AND MECHANISMS OF BUILDING AND MAINTAINING TOPOGRAPHY IN LARGE COLLISIONAL ORIGINS SUCH AS THE TIBETAN PLATEAU. PHYSICALLY-BASED MODELS OF POST SEISMIC DEFORMATION CONSTRAINED BY SPACE GEODETIC DATA MAY ALSO HELP FORECAST THE EVOLUTION OF STRESS AND STRAIN IN THE EARTH CRUST AND PROVIDE USEFUL INPUT FOR SEISMIC HAZARD ESTIMATES. DATA PRODUCTS AND PROCESSING AND MODELING TOOLS DEVELOPED IN THE COURSE OF THIS PROJECT WILL BE MADE AVAILABLE TO A WIDER RESEARCH COMMUNITY. AN ECIE NT FRAMEWORK FOR PROCESSING AND MODELING OF LARGE VOLUMES OF SAR DATA IS ESSENTIAL IN PREPARING FOR NASA S NISAR MISSION.