M. Kiszely

Attenuation of Coda Waves in Hungary

Microearthquake codas from 19 shallow depth local events have been analysed in Hungary. We estimate coda attenuation Qc in the frequency range 6 to 24 Hz used Sato’s (1977) single scattering model for a coda window of 12.5±2.5 s beginning at twice the S-wave travel time. Travel times were between 2–23 sec. The stations showed similar values of Qc which were about 400 at 6 Hz and about 1400 at 24 Hz. The Qc values in Hungary indicate moderate tectonic characteristic.

Experimental investigation of visualization methods of earthquake catalogue maps

The aim of the study is to find possible solutions to represent earthquake catalogue data and design maps which can help non-professionals to identify those places where earthquakes occurred frequently. The goal is to visualize all available catalogue data sets in a complex way on a single map, displaying the long-term recurrence times of earthquakes. Therefore, raw data and aggregated data were combined with different cartographic visualization techniques to test the applicability of earthquake maps. Preliminary research demonstrates that aggregation can improve the process of retrieving information from earthquake maps and 3D visualization is useful to find the places of earthquakes of highest magnitude. A second result is that 3D visualization is not effective in the comparison of quantities of released energy and the number of earthquakes.