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Article Dans Une Revue Seismological Research Letters Année : 2024

How Accurately Are MERMAID Seismograms Located?

Guust Nolet
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Joel D Simon
Sebastien Bonnieux

Résumé

Abstract Floating seismographs (Mobile Earthquake Recorder in Marine Areas by Independent Divers project “MERMAIDs”) record the data at depth at a location that is determined by linearly interpolating between the Global Positioning System positions when surfacing, assuming a constant drift velocity at depth. We study the influence of a changing drift velocity between surfacings and of a curvature of the drift trajectory. We separate localizations that directly follow a triggered ascent from those that are interpolated later. The first ones have on average a mislocation of 99 m due to curvature of the drift, against 685 m for interpolated localizations. Mislocations due to nonconstant velocity are somewhat smaller. Equivalent time errors have a distribution with heavier tails than Gaussian. The halfwidth of the 95% interval for equivalent arrival-time errors is smaller than 27 ms if the seismogram recording triggers an immediate ascent. If the recording is transmitted at a later surfacing, the interpolation is less precise with a 95% confidence interval halfwidth of 222 ms, but 67% of the errors are below 44 ms. We conclude that the localization errors have no significant impact on the accuracy of picked arrival times.
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Dates et versions

hal-04589668 , version 1 (27-05-2024)

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Guust Nolet, Joel D Simon, Sebastien Bonnieux. How Accurately Are MERMAID Seismograms Located?. Seismological Research Letters, 2024, ⟨10.1785/0220230377⟩. ⟨hal-04589668⟩
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