Revision of the earthquake catalogue and seismicity of Croatia, 1908–1992

Abstract

The paper presents the results of Croatian earthquake catalogue revision for the period 1908–1992. The revised catalogue lists a total of 4853 events (4486 after 1908), of which 3700 are mainshocks. All primary data sources available to us (seismograms, phase onset time readings, macroseismic questionnaires…) were consulted in order to improve the quality and reliability of magnitude, intensity and location. Along with the most important earthquake parameters the catalogue contains entries that enable assessment of the reliability of location and bibliographic references. Using the temporal analysis of the maximum‐likelihood estimate of the b‐value in the frequency‐magnitude relation, the catalogue is estimated to be complete for events with M ≥ 4.0 throughout the investigated period. The magnitude completeness threshold decreases to 3.8 after the middle of the century, and to about 3.6 in the last three decades. It is noted that the b‐value variation with time is closely tied to the seismic activity, as well as that at present there seems to be a lack of seismic energy release corresponding to the M = 6.0–6.5 earthquake.

Doline Morphometric Analysis and Karst Morphology of Biokovo Mt (Croatia) Based on Field Observations and Digital Terrain Analysis

“…The Tertiary period was characterized by intense tectonic movements and flysch rocks were formed on the then continental slopes (Magaš et al, 1972;Marinčić et al, 1969). The crustal movements are still active as shown by the large number of recent earthquakes (Herak et al, 1996). Based on data from the GPS-network installed in the area nearby Biokovo the magnitude of present-day tectonic movements may reach 2 cm/year (Cigrovski-Detelić, 1998).…”

Relative Sea-Level Change During the Late Holocene on the Island of Vis (Croatia) – Issa Harbour Archaeological Site

“…The discrepancy between the obtained data, particularly those older than 1600 years PB, and the models [55,56] can be attributed to the active tectonics, as the southern Croatian coast is an area with recorded seismicity [22,23,59] and to active deformation as measured by geodetic methods [60,61]. The results, which range between 0.17 and 0.3 mm/yr, show much smaller average rates of subsidence compared to the Northern Adriatic.…”

The Influence of Geological Hazard on Turistic Development in the Kvarner Area (Northeastern Adriatic Sea)

“…Razlog je nadiranje jadranske mikroploče prema sjeveru i njeno podvlačenje pod Dinaride (Stiros, 2009;Tomljenović et al, 2010). Najveća je seizmotektonska aktivnost u zoni prosječne širine 30 km koja se proteže od Klane preko Rijeke i Vinodola, a obuhvaća i sjeveroistočni dio otoka Krka (Prelogović i dr., 1995;Prelogović et al, 1998, Herak et al, 1996. Osnovna značajka seizmičnosti jest pojava većeg broja relativno slabijih potresa u seizmički aktivnim razdobljima.…”

“…Prema novim saznanjima, najjači potresi mogu imati veću magnitudu. Seizmički valovi mogu do područja Rijeke također doći i iz dva susjedna epicentralna područja, furlanskog i ljubljanskog, gdje se mogu očekivati potresi većih magnituda (Herak et al, 1996). Tsunamiji prouzročeni potresima zabilježeni su i na obalama Mediterana.…”