AGA SOPAC / SCIGN OBSERVER / AGENCY JEG SOPAC / SCIGN OBSERVER / AGENCY Nancy King U.S. Geological Survey OBSERVER / AGENCY OBSERVER / AGENCY PSOMAS CSRC OBSERVER / AGENCY -Unknown- OBSERVER / AGENCY Yehuda Bock CSRC OBSERVER / AGENCY Yehuda Bock Scripps Orbit and Permanent Array CenterOBSERVER / AGENCY Yehuda Bock SOPAC/CRTN OBSERVER / AGENCY Yehuda Bock SOPAC OBSERVER / AGENCY