Earthquake rupture dynamics frozen in exhumed ancient faults

Giulio Di Toro, Stefan Nielsen () and Giorgio Pennacchioni
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Giulio Di Toro: Paleontologia e Geofisica – Università di Padova
Stefan Nielsen: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Giorgio Pennacchioni: Paleontologia e Geofisica – Università di Padova

Nature, 2005, vol. 436, issue 7053, 1009-1012

Abstract: Written in stone Just by looking at the traces of solidified friction-induced melt produced by ancient earthquakes it is possible to learn about fractures that lasted a few seconds, during seismic events that took place millions of years ago. In the Italian Alps, large sections of an ancient fault have been uprooted by tectonic movements, brought to the surface almost intact, and polished by the abrasion of a glacier. Secondary fractures created during the earthquakes tend to lie to one side of the fault in a particular direction, suggesting that rupture propagated in the same direction during repeated earthquakes.

Date: 2005
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DOI: 10.1038/nature03910

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