Source of GPS seismo-ionospheric disturbances: A case study of the 2012 Gwaii earthquake
Abstract
The seismic-ionospheric disturbances (SIDs) can provide insights on solid-Earth and ionospheric coupling and ionospheric anomalies behaviors, while their sources are still not clear. In this paper, seismo-ionospheric disturbances (SIDs) are investigated by dual-frequency GPS observations following the 2011 Mw = 7.8 earthquake in the Haida Gwaii region, Canada. The SIDs in the southeast spread out at a speed of about 2 km/s, which agree with the Rayleigh wave propagation speed detected by the bottom pressure records (BPRs) at about 10 minutes after the onset. The SIDs are resulted by the upward propagation acoustic waves trigged by the Rayleigh wave in sequence from near-field to far-field. The strong correlation is found between the SIDs and the vertical ground motion recorded by seismometers nearby the epicenter. The vertical ground motion is the dominant source of the seismic ionospheric disturbances.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.G44A..08J
- Keywords:
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- 4341 Early warning systems;
- NATURAL HAZARDSDE: 4564 Tsunamis and storm surges;
- OCEANOGRAPHY: PHYSICALDE: 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGYDE: 8419 Volcano monitoring;
- VOLCANOLOGY