According to an example aspect of the present invention, there is provided an apparatus comprising a memory configured to store seismic data, at least one processing core configured to perform a geographic determination, based on the seismic data and reference data, the geographic determination relating to a geographical location of a device that produced the seismic data. In some embodiments, the device that produced the seismic data is comprised in a cloud computing server. In other embodiments, the device that produced the seismic data is integrated in a secure computing element on a motherboard of a computer. In further embodiments, the reference data originates in a trusted seismographic source.