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- Title
Rapid Detection of Co‐Seismic Ionospheric Disturbances Associated With the 2015 Illapel, the 2014 Iquique and the 2011 Sanriku‐Oki Earthquakes.
- Authors
Sanchez, S. A.; Kherani, E. A.; Astafyeva, E.; de Paula, E. R.
- Abstract
Co‐seismic Ionospheric disturbances (CID, or "ionoquakes") are disturbances in the electron density or total electron content (TEC) of the ionosphere, produced by the ground motion due to earthquakes. Usually, ionoquakes are detected in the near‐epicentral region within 8–10 min after an earthquake onset time. In this work, we present a new methodology that allows to estimate the CID arrival time based on determining the CID peak time in TEC measurements with respect to the peak time of seismic waves registered by the nearest seismic station. Our methodology also allows to understand the altitude of GNSS detection that otherwise remains ambiguous. We apply the newly developed techniques to detect CID signatures associated with three large earthquakes: the 2015 Illapel, the 2014 Iquique, and the 2011 Sanriku‐Oki. We show that for these events, the CID arrive 250–430 s after the time of the seismic wave peak, or 350–700 s after the earthquake onset time. Our analysis show that the first CID are detected at the altitudes of 150–180 km (the Sanriku earthquake) and of 200–300 km (the Illapel and the Iquique earthquakes). The disturbances represent high‐frequency acoustic oscillations that propagate with a horizontal speed faster than 0.75 km/s. Key Points: A new methodology to rapidly estimate the time and the altitude of detection of co‐seismic ionospheric disturbances (CID)The methodology uses data from near‐epicenter seismic stations to calculate the seismic peak time as an alternative to the earthquake onsetFirst report on detection of CID as soon as 400 s after the earthquake onset and 250–430 s after the seismic peak time
- Subjects
IQUIQUE (Chile); IONOSPHERIC disturbances; GROUND motion; SEISMIC waves; ELECTRON density; EARTHQUAKES; SEISMIC networks
- Publication
Journal of Geophysical Research. Space Physics, 2023, Vol 128, Issue 9, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2022JA031231