Precision gravity studies at Cerro Prieto: a progress report
- California State Univ., Long Beach
A third and fourth year of precision gravity data collection and reduction have now been completed at the Cerro Prieto geothermal field. In summary, 66 permanently monumented stations were occupied between December and April of 1979 to 1980 and 1980 to 1981 by a LaCoste and Romberg gravity meter (G300) at least twice, with a minimum of four replicate values obtained each time. Station 20 alternate, a stable base located on Cerro Prieto volcano, was used as the reference base for the third year and all the stations were tied to this base, using four to five hour loops. The field data were reduced to observed gravity values by (1) multiplication with the appropriate calibration factor; (2) removal of calculated tidal effects; (3) calculation of average values at each station, and (4) linear removal of accumulated instrumental drift which remained after carrying out the first three reductions. Following the reduction of values and calculation of gravity differences between individual stations and the base stations, standard deviations were calculated for the averaged occupation values (two to three per station). In addition, pooled variance calculations were carried out to estimate precision for the surveys as a whole.
- OSTI ID:
- 7369379
- Report Number(s):
- LBL-11967; CONF-810399-22; ON: DE82019261
- Resource Relation:
- Conference: 3. symposium on the Cerro Prieto geothermal field in Baja California, Mexico, San Francisco, CA, USA, Mar 1981; Related Information: In: Proceedings: third symposium on the Cerro Prieto geothermal field, Baja California, Mexico, by
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERRO PRIETO GEOTHERMAL FIELD
GRAVITY SURVEYS
CALIBRATION
DATA ANALYSIS
DATA PROCESSING
MEASURING METHODS
VOLCANOES
GEOPHYSICAL SURVEYS
GEOTHERMAL FIELDS
PROCESSING
SURVEYS
Geothermal Legacy
150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys