WE PROPOSE A SERIES OF ANALYSES AND SIMULATIONS TO DEVELOP A THEORETICAL BASIS FOR THE DIRECT DETERMINATION OF A RUBBLE PILE ASTEROID S STRENGTH AND SIMULATION OF ITS RESPONSE TO SEISMIC WAVES. DEVELOPMENT OF SUCH UNDERSTANDING COULD EVENTUALLY ENABLE THE DETERMINATION OF A GRAVITATIONAL AGGREGATE S INTERIOR STRUCTURE AS A FUNCTION OF ITS SURFACE RESPONSE TO CRATERING EVENTS. THE APPROACH WILL FOLLOW SEVERAL DIFFERENT LINES OF INVESTIGATION TO PURSUE THIS GOAL UNITED WITH A FOCUS ON HOW SEISMIC ENERGY MAY BE TRANSMITTED THROUGH A GRANULAR RUBBLE PILE BODY. SPECIFICALLY WE WILL FOCUS ON THE THEORETICAL CORRELATION BETWEEN SURFACE STRENGTH AND CRATER SIZE FOR A GIVEN BODY AND DEVELOP MODELS AND SIMULATIONS FOR HOW SEISMIC ENERGY FROM A SURFACE EVENT MAY BE TRANSMITTED THROUGH THE GRANULAR MATERIAL ON SUCH A BODY AND ON HOW SUCH WAVES COULD BE SENSED. THIS WORK WILL LAY THE BACKGROUND FOR POSSIBLE APPROACHES TO DETERMINING THE COHESIVE STRENGTH OF AN ASTEROID S REGOLITH THE EFFICIENCY OF SEISMIC TRANSMISSION THROUGH THE BODY AND ULTIMATELY ITS INTERIOR STRUCTURE. SUCH APPROACHES COULD BE OF GREAT VALUE IN DETERMINING LOCAL AND GLOBAL GEOTECHNICAL PROPERTIES OF POTENTIALLY HAZARDOUS SMALL BODIES AND THUS COULD PROVIDE INSIGHT INTO METHODS FOR THEIR MITIGATION. THE SPECIFIC GOALS OF THE ANALYSIS WILL BE: I INTERPRETATION OF SURFACE CRATERING EVENTS FOR CONSTRAINING BODY STRENGTH II ANALYSIS AND SIMULATION OF SEISMIC TRANSMISSION THROUGH GRANULAR MATERIAL III THE COUPLING OF GLOBAL SEISMIC WAVES IN A GRAVITATIONAL AGGREGATE INTO LOCAL SIMULATIONS OF SEISMIC SHAKING IN REGOLITH IV ANALYSIS AND SIMULATION OF THE DEPLOYMENT OF SENSOR PACKAGES TO A REGOLITH COVERED SURFACE AND THEIR SUBSEQUENT SENSITIVITY TO SEISMIC WAVES IN THE REGOLITH
$478,713FY2020National Aeronautics and Space AdministrationNASA
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