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The Potential for Earthquake Early Warning in Italy Using ElarmS by Marco Olivieri, Richard M. Allen, and Gilead Wurman
 

Summary: Short Note
The Potential for Earthquake Early Warning in Italy Using ElarmS
by Marco Olivieri, Richard M. Allen, and Gilead Wurman
Abstract The new Italian National Seismic Network (INSN) is a dense network of
broadband stations deployed for monitoring Italian seismicity. The network consists
of 250 stations with a typical station spacing of 40 km. Earthquake early warning is
the rapid detection of an event in progress, assessment of the hazard it poses, and
transmission of a warning ahead of any significant ground motion. We explore the
potential for using the INSN real-time network for the purpose of earthquake early
warning. We run the ElarmS early warning methodology off-line using a data set
of more than 200 events with magnitudes between 2.5 and 6.0. A scaling relation
for magnitude determination from the dominant period of the first seconds of signal
following the P onset is developed from the data set. The standard deviation in the
magnitude estimates using this approach is 0.4 magnitude units, and all event mag-
nitude estimates are within 0:75 magnitude units of the true magnitude. Given the
existing distribution of seismic stations it takes an average of 10 sec after event in-
itiation before the P wave has been detected at four stations. If we require a detection
at four stations before issuing the first alert, then the blind zone, within which no
warning would be available, has a radius of 37 km. The ElarmS methodology
can provide a warning earlier than this but with a greater uncertainty. An assessment

  

Source: Allen, Richard M. - Seismological Laboratory, Department of Earth and Planetary Science, University of California at Berkeley

 

Collections: Geosciences