An Evaluation of the Seismic Research Observatories

This report concludes a four-year evaluation of the Seismic Research Observatories SRO and the Abbreviated SROs ASRO. Five stations are evaluated SRO -- Ankara, Turkey, Bogota, Colombia, Grafenburg, Germany, and Shillong, India, and ASRO -- Kongsberg, Norway. Major areas of investigation included the analysis of noise levels, trends, and spectral content, and the estimation of the detection capability of each station with regard to specified geographic regions. Estimates were also made of data quality, station reliability, and mixed-event probability. In addition to the above, long-period noise analyses were extended over a full year for the following previously evaluated stations SRO -- Chiang Mai, Thailand, and ASRO -- Zongo LaPaz, Bolivia, Kabul, Afghanistan, and Matsushiro, Japan.