Unusually damaging Mw 4.9 earthquake near several French nuclear reactors
Nature 20th Jan 2021, An unusually damaging Mw 4.9 earthquake occurred on November 11, 2019 inthe south east of France within the lower Rhône river valley, an
industrial region that hosts several operating nuclear power plants.
industrial region that hosts several operating nuclear power plants.
The hypocentre of this event occurred at an exceptionally shallow depth of
about 1 km. Here we use far-field seismological observations to
demonstrate that the rupture properties are consistent with those commonly
observed for large deeper earthquakes.
about 1 km. Here we use far-field seismological observations to
demonstrate that the rupture properties are consistent with those commonly
observed for large deeper earthquakes.
In the absence of strong motion
sensors in the fault vicinity, we perform numerical predictions of the
ground acceleration on a virtual array of near-fault stations. These
predictions are in agreement with independent quantitative estimations of
ground acceleration from in-situ observations of displaced objects. Both
numerical and in-situ analyses converge toward estimates of an exceptional
level of ground acceleration in the fault vicinity, that locally exceeded
gravity, and explain the unexpectedly significant damage.
sensors in the fault vicinity, we perform numerical predictions of the
ground acceleration on a virtual array of near-fault stations. These
predictions are in agreement with independent quantitative estimations of
ground acceleration from in-situ observations of displaced objects. Both
numerical and in-situ analyses converge toward estimates of an exceptional
level of ground acceleration in the fault vicinity, that locally exceeded
gravity, and explain the unexpectedly significant damage.
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