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We have conducted a gravity survey of the Coso geothermal field to continue the time-lapse gravity study of the area initiated in 1991. In this report, we outline a method of processing the gravity data that minimizes the random errors and instrument bias introduced into the data by the Scintrex CG-5 relative gravimeters that were used. This method includes the removal of a secondary tidal effect, measured at a continuous base station, not captured in the primary tidal corrections typically applied by using Longman’s formula from 1959. The method also minimizes the potentially significant effect of daily instrument drift by using multiple repeat gravity measurements throughout the day to characterize the linear component of the drift. After processing, the standard deviation of the data was estimated to be ±13 microGals (μGal). These data reveal that the negative gravity anomaly over the Coso geothermal field, centered on gravity station CER1, is continuing to increase in magnitude over time. Preliminary modeling indicates that water-table drawdown at the location of CER1 is between 65 and 326 meters (m) over the last two decades. We note, however, that several assumptions on which the model results depend, such as constant elevation and free-water level over the study period, still require verification.

A time-lapse gravity survey of the Coso geothermal field, China Lake Naval Air Weapons Station, California