Three-component Raspberry Shake 3D sensors were depployed at different locations within the city of Oslo. The network was extended gradually starting in May 2021, with up to 11 stations recording simultaneously from June 2022 to July 2023. GPS antennas were deployed where possible. Timing provided through NTP (Network Time Protocol) was sufficient at a few sites where free view to the sky could not be established. Sensor locations were in the basement of private businesses, private houses, and public school buildings. All data are recorded continuously with a 100 Hz sampling rate. The purpose of the network was urban seismic event and near-subsurface monitoring.