Seismological Studies of Convection Beneath the Plates
{'Code': '06030204', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'James H. Whitcomb', 'PO_EMAI': None, 'PO_PHON': None}
Mapping the pattern of convection beneath the plates is                    central to our understanding of the mode of heat transfer within                the earth, the chemical differentiation and evolution of the                    mantle, the viscosity structure of the mantle, and the forces that              drive plate tectonics.  Much progress has recently been made                    toward directly mapping the pattern through the effects of                      convection on seismic velocities.  Two types of velocity                        variations are expected; lateral heterogeneities related to                     composition or temperature, and anisotropy caused by fabric or                  crystal alignment associated with deformation during flow.  The                 purpose of the research proposed here is to map velocity                        structures in the upper mantle related to convection beneath the                plates, with particular emphases on testing hypotheses of the                   existence of anisotropy in specific regions and on mapping small-               scale (wavelengths 500 to 3000 km) features using phases that                   sample the earth in ways that provide high lateral resolution in                otherwise inaccessible areas.
{'FirstName': 'Donald', 'LastName': 'Forsyth', 'PI_MID_INIT': 'W', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Donald W Forsyth', 'EmailAddress': 'donald_forsyth@brown.edu', 'NSF_ID': '000405101', 'StartDate': '06/01/1988', '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': 'E3FDXZ6TBHW3'}
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{'Code': '157400', 'Text': 'Geophysics'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8720316.xml'}