The German Experimental Seismic System, known as the GERESS array, is identified in Annex 1 of the Protocol to the Comprehensive Nuclear Test-Ban Treaty (CTBT) as a primary seismic station (PS 19). Since its construction and commissioning in 1991, the performance of this array has been hampered by incidental occurrences of timing problems involving the loss of time synchronization for as many as a few array elements. During GSETT-3 (Conference of Disarmament Group of Scientific Experts Technical Test-3) and since the establishment of the Vienna International Data Centre (IDC), the array has contributed data to the CTBT monitoring system. Beginning...

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