AGA OBSERVER / AGENCY AGA USGS/SCIGN OBSERVER / AGENCY JEG OBSERVER / AGENCY KWH OBSERVER / AGENCY Nancy King OBSERVER / AGENCY Nancy King United States Geological Society OBSERVER / AGENCY Nancy King U.S. Geological Survey OBSERVER / AGENCY OBSERVER / AGENCY SVW SOPAC / SCIGN OBSERVER / AGENCY SVW USGS/SCIGN OBSERVER / AGENCY -Unknown- OBSERVER / AGENCY USGS-Pasadena USGS/SCIGN OBSERVER / AGENCY WRC OBSERVER / AGENCY