1763 Komárom earthquake
{{Short description|Earthquake affecting Hungary}}
{{Infobox earthquake
|title = 1763 Komárom earthquake
|pre-1900 = yes
|local-date = {{Start date|1763|06|28}}
|map2 = {{Location map | Hungary
| label =
| lat = 47.735
| long = 18.153
| mark = Bullseye1.png
| marksize = 40
| position = top
| width = 250
| float = right
| caption =
| relief = yes}}
|magnitude = 6.2 to 6.5 {{M|w|link=y}}
|depth = 15.0 km
|location = {{coord|47.73|N|18.15|E|type:event_region:IN-HP|display=inline,title}}
|countries affected = Kingdom of Hungary
|tsunami =
|damage =
}}
The 1763 Komárom earthquake occurred in or near the town of Komárom in Komárom County in the Kingdom of Hungary on 28 June between 5 and 6 in the morning. The earthquake has been estimated at 6.2 to 6.5 on the moment magnitude scale.
Background
The Komárom earthquake was an intraplate earthquake in the Pannonian Basin associated with the Rába-Hurbanovo tectonic line. Earthquakes in the region are caused by deformation resulting from the movement of the Adriatic plate relative to the Eurasian plate. The 1763 earthquake accounts for about 80% of all the seismic moment released in the Komárom area since 1599. Due to the lack of seismologic instruments in 1763, the mechanism of and depth of the earthquake is not known, though most earthquakes in the region occur in the upper 20 km of crust.
Casualties and damage
File:Komarom-1763-karl friedel festmenye.jpg
The earthquake killed 83 people and 102 people were wounded. Damage in Komárom was extensive – contemporary reports note that the newly constructed Jesuit church and college were heavily damaged, including the collapse of two towers which killed several people. According to reports, 102 people were wounded and 7 churches, 279 dwelling fully and 353 partially collapsed. Other reports indicate that soil liquefaction occurred due to the earthquake.
Magnitude estimation
Recent probabilistic analyses have applied structural fragility functions to the 1763 Komárom earthquake in order to refine its magnitude estimate. Morais and colleagues (2017) developed analytical fragility functions by modelling a typical one‑storey commoners' house archetype—representative of the adobe masonry dwellings in Komárom—using dynamic structural analysis in OpenSees (a software framework for earthquake simulation) and 30 site‑specific ground‑motion records for the region. Combining these functions with contemporary damage reports (which record that some 91 % of the town's 1169 houses were affected, including 279 total collapses and 353 partial collapses) and central European attenuation relations, the study obtained preliminary magnitude estimates of Mw 6.20–6.97 for an epicentral distance of 10 km and Mw 6.44–7.08 for 12 km. When uncertainties in damage‑state counts, material properties and choice of attenuation model were fully incorporated, the posterior mean magnitude was calculated at about 6.4 with a standard deviation of about 0.6.
See also
References
{{Reflist|colwidth=30em|refs=
{{cite journal|journal=Abhandlungen der Geologischen Bundesanstalt|title=Historical Earthquakes in Central Europe|location=Wien|date=August 1992|volume=48|pages=33–50|url=http://www.zobodat.at/stable/pdf/AbhGeolBA_48_0033-0050.pdf|first1=Ute|last1=Eisinger|first2=Rudolf|last2=Gutdeutsch|first3=Christa|last3=Hammerl|issn=0378-0864|isbn=3-900312-83-4}}
}}
{{DEFAULTSORT:1763 Komarom earthquake}}
Category:18th century in Hungary
Category:1763 in the Habsburg monarchy
Category:Earthquakes in Europe