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| Titel |
Prompt gravity anomaly induced to the 2011Tohoku-Oki earthquake |
| VerfasserIn |
Jean-Paul Montagner, Kevin Juhel, Matteo Barsuglia, Jean-Paul Ampuero, Jan Harms, Eric Chassande-Mottin, Bernard Whiting, Pascal Bernard, Eric Clévédé, Philippe Lognonné |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144587
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| Publikation (Nr.) |
 EGU/EGU2017-8431.pdf |
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| Zusammenfassung |
| Transient gravity changes are expected to occur at all distances during an
earthquake rupture, even before the arrival of seismic waves. Here we report on the
search of such a prompt gravity signal in data recorded by a superconducting gravimeter
and broadband seismometers during the 2011 Mw 9.0 Tohoku-Oki earthquake. During the
earthquake rupture, a signal exceeding the background noise is observed with a statistical
significance higher than 99% and an amplitude of a fraction of μGal, consistent in sign and
order-of-magnitude with theoretical predictions from a first-order model.
While prompt gravity signal detection with state-of-the-art gravimeters and seismometers is challenged
by background seismic noise, its robust detection with gravity gradiometers under development could open new directions in earthquake seismology, and overcome fundamental
limitations of current earthquake early-warning systems (EEWS) imposed by the propagation speed
of seismic waves. |
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