Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantifying the Value of Real-time Geodetic Constraints for Earthquake
  Early Warning using a Global Seismic and Geodetic Dataset   Geodetic earthquake early warning (EEW) algorithms complement point-source
seismic systems by estimating fault-finiteness and unsaturated moment magnitude
for the largest, most damaging earthquakes. Because such earthquakes are rare,
it has been difficult to demonstrate that geodetic warnings improve ground
motion estimation significantly. Here, we quantify and compare timeliness and
accuracy of magnitude and ground motion estimates in simulated real time from
seismic and geodetic observations for a suite of globally-distributed, large
earthquakes. Magnitude solutions saturate for the seismic EEW algorithm (we use
ElarmS) while the ElarmS-triggered Geodetic Alarm System (G-larmS) reduces the
error even for its first solutions. Shaking intensity (MMI) time series
calculated for each station and each event are assessed based on MMI-threshold
crossings, allowing us to accurately characterize warning times per-station. We
classify alerts and find that MMI 4 thresholds result in only 12.3% true
positive (TP) alerts with a median warning time of 16.3 +- 20.9 s for ElarmS,
but 44.4% TP alerts with a longer median warning time of 50.2 +- 49.8 s for
G-larmS. The geodetic EEW system reduces the number of missed alerts for
thresholds of MMI 3 and 4 by over 30%. If G-larmS was triggered instantaneously
at the earthquake origin time, the performance statistics are similar, with
slightly longer warning times and slightly more accurate magnitudes. By
quantifying increased accuracy in magnitude, ground motion estimation, and
alert timeliness; we demonstrate that geodetic algorithms add significant
value, including better cost savings performance, to EEW systems.

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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn