Accelerographs are instruments that excel in recording moderate to strong earthquakes at short epicentral distances, unlike highly sensitive seismographs that are not suitable for this purpose. Therefore, accelerographs are an excellent complement to the traditional seismographic network in the case of strong and nearby earthquakes. Thus, the main goal of Component 2 is to deploy accelerographs in various locations within the seismically active area, on different types of soil, and collect a sufficient number of ground acceleration records caused by sufficiently strong earthquakes. Records of earthquakes of different magnitudes (from weaker to stronger) and different epicentral distances (close and far) are necessary for developing better attenuation relations used in the seismic hazard assessment process. Ground motion prediction equations (GMPE) connect measures of ground motion intensity (such as peak ground acceleration (PGA), peak ground velocity (PGV), and spectral acceleration response (PSA)) with seismological parameters in a specific area, such as earthquake magnitude, fault type, epicentral distance, and local soil conditions. For the area of Croatia, specific attenuation relations do not exist, partly due to the insufficiently developed existing accelerograph network and the small number of moderate to strong earthquakes recorded with such instruments.
To achieve this goal, Component 2 of the CRONOS project has procured 14 Kinemetrics accelerographs, including 11 surface-type Obsidian accelerographs and 3 borehole-type Quanterra accelerographs, for its research purposes. In order to learn how to operate the instruments, properly install them, and later analyze the acquired data, a two-day training session was held on July 3rd and 4th, 2023. During the training, the collaborators of Component 2 familiarized themselves with the instruments themselves, as well as the software for data processing. The training was conducted by experts from Seismosr (Beograd, Srbija), the representatives of Kinemetrics – the manufacturer of the acquired instruments. The participants of the training included the collaborators of Component 2: Snježana Markušić, Davor Stanko, Mario Gazdek, Bruno Mravlja, Iva Lončar, and Danijel Štih.
Prepared by Iva Lončar and Bruno Mravlja