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Performance of Earthquake Early Warning Systems during the 2016–2017 Mw 5–6.5 Central Italy Sequence
Author(s)
Language
English
Obiettivo Specifico
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/89 (2018)
Pages (printed)
1-12
Issued date
2018
Abstract
Earthquake early warning systems (EEWSs) are nowadays contributing
to seismic risk mitigation actions, both in terms of
losses and societal resilience, by issuing an alert promptly after
the earthquake origin and before the ground-shaking impacts
the target to be protected. In this work, we analyze the performance
of network-based and stand-alone (on-site) early warning
systems during the 2016–2017 central Italy sequence,
characterized by events with magnitude as large as 6.5. For the
largest magnitude event, both systems predict well the ground
shaking nearby the event source, with a rate of success in the
85%–90% range, within the potential earthquake damage zone.
However, the lead time, that is, the time available for security
actions, is significantly larger for the network-based system. For
the regional system, it increases to more than 10 s at 40 km
from the event epicenter. The stand-alone system performs better
in the near-source region, still showing a positive albeit
small lead time (<2 s). Far away from the source (>60 km),
the performances slightly degrade, mostly owing to the large
uncertainty in the attenuation relationships. This study opens
up the possibility for making an operational EEWS in Italy,
based on the available acceleration networks, provided that the
delay due to data telemetry has to be reduced.
to seismic risk mitigation actions, both in terms of
losses and societal resilience, by issuing an alert promptly after
the earthquake origin and before the ground-shaking impacts
the target to be protected. In this work, we analyze the performance
of network-based and stand-alone (on-site) early warning
systems during the 2016–2017 central Italy sequence,
characterized by events with magnitude as large as 6.5. For the
largest magnitude event, both systems predict well the ground
shaking nearby the event source, with a rate of success in the
85%–90% range, within the potential earthquake damage zone.
However, the lead time, that is, the time available for security
actions, is significantly larger for the network-based system. For
the regional system, it increases to more than 10 s at 40 km
from the event epicenter. The stand-alone system performs better
in the near-source region, still showing a positive albeit
small lead time (<2 s). Far away from the source (>60 km),
the performances slightly degrade, mostly owing to the large
uncertainty in the attenuation relationships. This study opens
up the possibility for making an operational EEWS in Italy,
based on the available acceleration networks, provided that the
delay due to data telemetry has to be reduced.
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article
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