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Meteoroid studies on DAS and large-N networks: data sets

Urheber*innen

Vera Rodriguez,  Ismail
External Organizations;

/persons/resource/isken

Isken,  Marius Paul
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dahm

Dahm,  T.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/pjousset

Jousset,  P.
2.2 Geophysical Imaging of the Subsurface, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Lamb,  Oliver D.
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Kristjánsdóttir,  Sigríður
External Organizations;

Jónsdóttir,  Kristín
External Organizations;

Sanchez-Pastor,  Pilar
External Organizations;

Clinton,  John
External Organizations;

/persons/resource/wollin

Wollin,  Christopher
2.2 Geophysical Imaging of the Subsurface, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Baird,  Alan F.
External Organizations;

Wuestefel,  Andreas
External Organizations;

Eibl,  Eva P. S.
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Goertz-Allmann,  Bettina P.
External Organizations;

Oye,  Volker
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Hjörleifsdóttir,  Vala
External Organizations;

Obermann,  Anne
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Kraft,  Toni
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Zitation

Vera Rodriguez, I., Isken, M. P., Dahm, T., Jousset, P., Lamb, O. D., Kristjánsdóttir, S., Jónsdóttir, K., Sanchez-Pastor, P., Clinton, J., Wollin, C., Baird, A. F., Wuestefel, A., Eibl, E. P. S., Goertz-Allmann, B. P., Oye, V., Hjörleifsdóttir, V., Obermann, A., Kraft, T. (2022): Meteoroid studies on DAS and large-N networks: data sets.
https://doi.org/10.5880/GFZ.2.2.2022.002


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5023141
Zusammenfassung
We present an outstanding record of local, dense Large-N seismic and distributed acoustic sensor observations of a meteoroid from July 2, 2021 in Iceland. Our dataset includes high-quality observations from seven small aperture arrays of few hundred meters, an infrasound array, and a rotational station, all located within the distance range of 300 km. The high-frequency data show a variety of different phases associated with the source process along the atmospheric trajectory, including impulsive negative 1 first ground motions, a complex coda wave train about 2.5 s long thereafter, an azimuth-dependent stopping phase with reversed polarity between 1-25 s after the first arrival, which is resolved over only a few kilometers. The ground motion amplitude between the first and last arrivals is generally elevated. We associate the waveform in the 2.5 s coda with meteor-atmosphere interactions and nonlinear plasma processes that produce an oscillating shock-wave source pulse. Our data suggest a small azimuth-dependent deflection or dispersion of this source pulse, which may be related to the meteoroid’s deceleration in the atmosphere. We present a finite-length kinematic line-source pulse model that consistently explains the different phases inside and outside the Mach cone segment of our images, their wave amplitude variations, and a polarity change between the first phase and the terminating phase. The previously undiscovered rich directivity effects can also explain seemingly contradictory, time-dependent wave energy beam-directions at the various small aperture arrays and along the DAS cable. A combination of conventional locations and a Bayesian inversion of first and stopping phase arrivals led to a precise localization of the meteor trajectory.