Jackson Currie from USGS trims the ends of the sparker while Bran Black and Tim Kane from OSU observe. Salt water erodes the electrodes at the ends of the sparker and they must be trimmed every few hours to ensure accurate data collection.
 Sparker Trimming
Image courtesy of San Andreas Fault 2010 Expedition, NOAA-OER. Download image (jpg, 160 KB).

Jackson Currie from USGS trims the ends of the sparker while Bran Black and Tim Kane from OSU observe. Salt water erodes the electrodes at the ends of the sparker and they must be trimmed every few hours to ensure accurate data collection.

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