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Summary: Seismological Research Letters Volume 80, Number 5 September/October 2009 755doi: 10.1785/gssrl.80.5.755
INTRODUCTION
Rapid urbanization, the interconnection of economies and
increasing dependence on technology makes modern society
ever more vulnerable to natural disasters. is is particularly
true when considering the growth of so-called mega cities
(de ned by the United Nations as metropolitan areas with
in the developing world. is has led to the recognition of the
importance of early warning systems as one means of mitigat-
ing the potential human and economic losses resulting from
natural disasters (e.g., International Strategy for Disaster
-
tion (e.g.
have some form of earthquake early warning system (EEWS)
either in operation or under development (e.g., Taiwan: Wu
Wurman
Ionescu
However, these systems usually involve the use of a relatively
low number of sensors (from several to tens of units), a fact
largely dictated by the high cost of such instrumentation. In
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