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The Međimurje (Croatia) earthquake of 1738

The 30 March 1738 earthquake with the epicenter near Čakovec in Međimurje (Croatia) is the largest earthquake we know of in the low- seismicity area including northernmost Croatia, north-eastern Slovenia, south-eastern Austria and south-western Hungary. So far, it attracted very little attention in the seismological community of those countries. It is missing (or has wrong parameters) in most of the relevant earthquake catalogues, which must have influenced hazard assessment in these parts of Europe, most critically in the Međimurje region itself. We present contemporary historical data shedding some light on the effects the earthquake had on settlements mostly in Međimurje, but also in Slovenia and Hungary. We were able to assign intensity to 12 localities surrounding the epicenter, and to resolve the confusion about its date of occurrence. The intensity points were inverted for the location of macroseismic hypocenter and epicentral intensity (I0 = 7.9 MSK). The epicenter is found to lie on the hanging wall of the reverse Čakovec fault, about 3 km from its surface trace, near the town of Čakovec. The shallow macroseismic focal depth (5 km) is consistent with rather small felt area for the earthquake of this size.

The 30 March 1738 earthquake ; seismicity

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