The Neulengbach earthquake, the strongest historically documented…
June 1590 CE
The Neulengbach earthquake, the strongest historically documented earthquake in what today is Northeastern Austria, occurs on September 15, 1590 shortly before midnight amidst a long series of much weaker seismic activity starting on June 29, 1590 and with aftershocks reported until November 12.
The epicenter is believed to have been located southeast of Neulengbach, about thirty to forty kilometers west of Vienna, in a flat dipping and North-South striking thrust fault that is part of the Vienna Transform fault zone.
Significant destruction occurs in Vienna, which at this time has about fifty thousand inhabitants living within a fortified and densely urban area that covers what today is the innermost city center.
The upper half of St. Michael's church tower collapses in spite of its steel reinforcements, the Scottish Abbey is severely damaged, and the Southern tower of St. Stephen's Cathedral suffers as well.
At this time it is not customary to document damage to property that does not serve sacral purposes or is directly used by the aristocracy, and very little information has survived concerning the destruction and harm inflicted on ordinary citizens.
Therefore, the fact that the death of nine people in a collapsing traveler's hostel is specifically mentioned in the chronicles suggests that the number of urban casualties cannot have been significant.
At Zwentendorf, forty kilometers to the north of the presumed epicenter, the local parish church is so heavily damaged that it becomes unusable. (Exposure of this particular area to seismic risk is to play a significant role in the public debate that erupts in the 1970s concerning plans for a nuclear power plant near Zwentendorf.)
Vaults and roofs collapse at the Mauerbach Charterhouse West of Vienna, and many fortifications in Lower Austria (e.g., at Sieghartskirchen and Altlengbach) need substantial repair.
Apparently the seismic event propagates far along the Vienna Transform fault but does not extend southward of the Alps.
Strong shocks are reported from up to three hundred kilometers to the North of the epicenter, at places such as Abertham in the westernmost part of Bohemia and Frankenstein in Silesia, where the slightly disfigured city tower can still be seen.