Geodynamic Institute collects and evaluates macroseismic observation for more than 100 years. The observation is published in the monthly bulletins and in such a way is distributed to the scientific community, comprising the primary material for research studies. During the last years, within the frame of various research projects, Geodynamic Institute updated the whole procedure of macroseismic observation management. More specifically:

The questionnaire has been improved, including more detailed description of damage in order for the user to be helped answering. These changes did not affect the grading according to the intensity scale used till now (Modified Mercalli, MM). Each answer has its own code number, so the answers can be introduced to statistical analysis. The questionnaire is included in the G.I. web site, in order for anybody to answer if and how he felt the earthquake and if and what damage he observed.

The questionnaire-mailing-procedure, as well as the management of the answers, are handled by a database of macroseismic observations, originally developed under MsAccess environment. The database includes three main tables with one-to-many relationships: Table SITE includes the administrative information of the municipalities and communities gathered after “Kapodistrias” law for local authorities and the recent inventory of the Hellenic Statistical Service, like the name of the municipality, the prefecture, the population, the mail and electronic address, phone numbers, as well as coordinates and the dominant surface geology (IGME maps, 1:50000). Each record has its own unique code number. The spatial distribution of the sites to which the questionnaire has been sent after the strong earthquake (according to criteria concerning the spatial distribution, the population and the epicentral distance)  can be checked. Table QUAKE includes the seismic parameters of the earthquakes within the area 33^oN - 42^oN and 19^oE - 29^oE having a magnitude M_s greater than 5.5 occurred during the period 1900 – today. The table is updated continuously with the new strong earthquakes. Each record has its own code number, while a column is dedicated to a notification about the existence or not of macroseismic observation. Table EFFECT includes the macroseismic intensity observed at each site for the different earthquakes. Other data included here are the epicentral and hypocentral distance and the azimuth (the angle between the site-epicenter line and the line of north. Each observation is characterized by the combination of the site code and the earthquake code. An auxiliary table named INFO includes photographs, descriptions, references about the damage and the earthquakes.