@article{fdi:010073108,
  title = {{M}ultisensor, microseismic observations of a hurricane transit near the {ALOHA} cabled observatory},
  author = {{B}utler, {R}. and {A}ucan, {J}er{\^o}me},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he generation of microseisms is investigated at the {ALOHA} {C}abled {O}bservatory ({ACO}) north of {O}ahu during the close passage of {H}urricane {L}ester in {S}eptember 2016. {S}ensors include a seafloor {ALOHA} pressure gauge at {ACO}, {KIP} seismic data on {O}ahu, and nearby wave buoys. {E}xamination of frequency-direction spectra from wave buoys and numerical wave model outputs confirms two separate microseism generation processes: {A}t frequencies <0.225{H}z, the microseisms are generated by swells from {H}urricane {L}ester and {T}yphoon {L}ion{R}ock traveling in opposite directions in the vicinity of {ALOHA}. {A}t higher frequencies >0.225{H}z, microseisms are dominated by waves originating from {H}urricane {L}ester. {T}he cross-over frequency (0.225{H}z) occurs where the ocean wave group velocity matches the {H}urricane storm track speed. {C}orrecting for impedance, the spectrogram for energy at {ALOHA} closely correlates with {KIP}. {W}hen opposing swells meet at a distance from the {H}urricane {L}ester and {ACO}, the resulting microseisms also spread geometrically in propagation to {ALOHA} and {KIP}, effectively equivalent to 1/{R}-2. {A}t the microseism peak, 4 {S}eptember, the dominant motions of {KIP} are observed with retrograde particle motion characteristic of {R}ayleigh modes, in both the radial-vertical and transverse-vertical sagittal planes at distances of less than or similar to 400km from the eye. {O}therwise, the energy on the transverse component is comparable to the radial component. {W}e hypothesize that the observed transverse energy arises locally: (1) from the extended microseism source region near {ACO} and (2) and from scattering by dipping structure and anisotropy embedded in the crust during emplacement at the {P}acific-{F}arallon ridge. {P}lain {L}anguage {S}ummary {T}he close passage of {H}urricane {L}ester near the {H}awaiian {I}slands in {S}eptember 2016 afforded an in-depth, close-up study of storm generation of the largest background vibrations observed planet wide. {T}he observations at the {ALOHA} {C}abled {O}bservatory on the seafloor below the {H}urricane, coupled with seismic sensors on {O}ahu, and ocean wave buoys off shore, present a detailed picture connecting the storm to the ocean and {E}arth. {W}ave interactions from a distant typhoon near {J}apan play an important role. {V}ibration energy levels observed on {O}ahu closely match those on the sea floor 100 km north of {O}ahu, where {ALOHA} {C}abled {O}bservatory is the world's deepest seafloor observatory at 4,728 m depth. {C}haracteristic vibrations generated radially from the {H}urricane were observed, along with unexpected transverse motions perpendicular to the radial waves. {T}his latter observation is consistent with a broad source region extending from {H}urricane {L}ester and generating the vibrations. {E}vidence for substantial scattering of the vibrations in the ocean crust is inferred, due to slanting layers and directionally varying velocities, dating back nearly 80 million years ago when the sea floor was being originally being emplaced at a {P}acific mid-ocean ridge. {T}his hurricane transit yields new knowledge on how storms vibrate the planet.},
  keywords = {microseism ; hurricane ; transverse ; {R}ayleigh waves ; crustal scattering ; {HAWAII} ; {PACIFIQUE} {EST}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {123},
  numero = {4},
  pages = {3027--3046},
  ISSN = {2169-9313},
  year = {2018},
  DOI = {10.1002/2017jb014885},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073108},
}