Rock Friction Constitutive Experiments as Related to Theory of Earthquake Instability
{'Code': '06030204', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Michael A. Mayhew', 'PO_EMAI': None, 'PO_PHON': None}
This award continues experimental and theoretical study of                 the constitutive behavior of rock friction and its implications                 for understanding earthquake instabilities.  At present little                  fundamental understanding exists concerning the micro-scale                     processes that are responsible for observed constitutive                        behavior.  The physical meaning of the state variables is                       unknown.  Consequently, extrapolation of laboratory results to                  time and length scales relevant to earthquakes cannot be done                   with confidence.  This research will focus on discovering the                   fundamental micro-scale processes responsible for the observed                  behavior and using this information to formulate constitutive                   descriptions with a sound physical basis.  The approach is to                   apply recent advances in the fields of intermolecular and surface               forces and subcritical crack growth to understanding frictional                 resistance.
{'FirstName': 'Terry', 'LastName': 'Tullis', 'PI_MID_INIT': 'E', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Terry E Tullis', 'EmailAddress': 'terry_tullis@brown.edu', 'NSF_ID': '000402048', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Brown University', 'CityName': 'PROVIDENCE', 'ZipCode': '029129100', 'PhoneNumber': '4018632777', 'StreetAddress': '1 PROSPECT ST', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Rhode Island', 'StateCode': 'RI', 'CONGRESSDISTRICT': '01', 'CONGRESS_DISTRICT_ORG': 'RI01', 'ORG_UEI_NUM': 'E3FDXZ6TBHW3', 'ORG_LGL_BUS_NAME': 'BROWN UNIVERSITY', 'ORG_PRNT_UEI_NUM': None}
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[{'Code': '1574', 'Text': 'Geophysics'}, {'Code': '1576', 'Text': 'NATIONL EARTHQK HZRD REDCT PRG'}]
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8816791.xml'}