Leonard is an unincorporated community in the southeastern corner of Tulsa County, Oklahoma, United States.

This facility was established in 1960, because it was "seismically quiet," making it a satisfactory place for monitoring underground nuclear tests.

A 160 acres (65 ha) site near Leonard was purchased by Sarkis Foundation and given to the State of Oklahoma.

[8] The Russians were allowed to build a seismograph station on leased ground adjacent to the OGSO, which they returned to Oklahoma after completing their mission seven years later.

However, Austin Holland, state seismologist, has said that it is technologically obsolete and that the work can be done in the main OGS office at the OU campus in Norman.