Constrained Optimal Solutions in Seismic Imaging
{'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}
The scope of our continuing research is the application of                      image reconstruction or tomographic techniques to a systematic                  and rigorous study of the Earth's laterally-heterogenous mantle                 and core seismic velocity structures.  In the course of the                     initial funding period of this proposal, using a large-matrix,                  row-action inversion method that was developed, tested and                      refined during the first stages of our analysis, we have                        constructed spherically-symmetric, lower-mentle P and S-wave                    velocity models as well as P and S-wave seismic-station travel-                 time residual correction sets.  We are using travel-time data                   from the International Seismological Centre's (ISC) short-                      period, global earthquake catalog.  Nearly 2.4 million source-                  receiver data points from 24,423 earthquakes, representing                      teleseismic P and S ray paths in the 25o-105o epicentral                        distance range (bottoming depths from 700 kilometers to the                     core-mantle boundary) were used in the model inversions.  The P                 results and the S velocity model show significant variation and                 improvement from results obtained by other studies and the S                    station correction set is possibly the first usable set ever                    developed.  Using these improved models of both the lower                       mantle's spherically averaged structure and the upper-mantle                    and crustal lateral velocity variations as starting models, we                  are continuing and extending our analysis in a systematic                       investigation of the structure of the Earth's mantle, outer and                 inner core and core-mantle boundary.
[{'FirstName': 'Allen', 'LastName': 'Olson', 'PI_MID_INIT': 'H', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Allen H Olson', 'EmailAddress': None, 'NSF_ID': '000468910', 'StartDate': '09/01/1987', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'John', 'LastName': 'Orcutt', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'John A Orcutt', 'EmailAddress': 'jorcutt@ucsd.edu', 'NSF_ID': '000415523', 'StartDate': '09/01/1987', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Freeman', 'LastName': 'Gilbert', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Freeman Gilbert', 'EmailAddress': 'fgilbert@ucsd.edu', 'NSF_ID': '000343668', 'StartDate': '09/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
{'Name': 'University of California-San Diego Scripps Inst of Oceanography', 'CityName': 'LA JOLLA', 'ZipCode': '920931500', 'PhoneNumber': '8585341293', 'StreetAddress': '8622 DISCOVERY WAY # 116', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '50', 'CONGRESS_DISTRICT_ORG': 'CA50', 'ORG_UEI_NUM': 'QJ8HMDK7MRM3', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF CALIFORNIA SAN DIEGO', 'ORG_PRNT_UEI_NUM': 'QJ8HMDK7MRM3'}
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[{'Code': '1574', 'Text': 'Geophysics'}, {'Code': '3521', 'Text': None}]
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