Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detiding DART buoy data for real-time extraction of source coefficients
  for operational tsunami forecasting   U.S. Tsunami Warning Centers use real-time bottom pressure (BP) data
transmitted from a network of buoys deployed in the Pacific and Atlantic Oceans
to tune source coefficients of tsunami forecast models. For accurate
coefficients and therefore forecasts, tides at the buoys must be accounted for.
In this study, five methods for coefficient estimation are compared, each of
which accounts for tides differently. The first three subtract off a tidal
prediction based on (1) a localized harmonic analysis involving 29 days of data
immediately preceding the tsunami event, (2) 68 pre-existing harmonic
constituents specific to each buoy, and (3) an empirical orthogonal function
fit to the previous 25 hrs of data. Method (4) is a Kalman smoother that uses
method (1) as its input. These four methods estimate source coefficients after
detiding. Method (5) estimates the coefficients simultaneously with a
two-component harmonic model that accounts for the tides. The five methods are
evaluated using archived data from eleven DART buoys, to which selected
artificial tsunami signals are superimposed. These buoys represent a full range
of observed tidal conditions and background BP noise in the Pacific and
Atlantic, and the artificial signals have a variety of patterns and induce
varying signal-to-noise ratios. The root-mean-square errors (RMSEs) of least
squares estimates of sources coefficients using varying amounts of data are
used to compare the five detiding methods. The RMSE varies over two orders of
magnitude between detiding methods, generally decreasing in the order listed,
with method (5) yielding the most accurate estimate of source coefficient. The
RMSE is substantially reduced by waiting for the first full wave of the tsunami
signal to arrive. As a case study, the five method are compared using data
recorded from the devastating 2011 Japan tsunami.

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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org