Parameters of seismic source as deduced from 1 Hz ionospheric GPS data: Case study of the 2011 Tohoku‐oki event

Abstract

[1] Following the first-time ionospheric imaging of a seismic fault, here we perform a case study on retrieval of parameters of the extended seismic source ruptured during the great M9.0 Tohoku-oki earthquake. Using 1 Hz ionospheric GPS data from the Japanese network of GPS receivers (GEONET) and several GPS satellites, we analyze spatiotemporal characteristics of coseismic ionospheric perturbations and we obtain information on the dimensions and location of the sea surface uplift (seismic source). We further assess the criterion for the successful determination of seismic parameters from the ionosphere: the detection is possible when the line of sights from satellites to receivers cross the ionosphere above the seismic fault region. Besides, we demonstrate that the multisegment structure of the seismic fault of the Tohoku-oki earthquake can be seen in high-rate ionospheric GPS data. Overall, our results show that, under certain conditions, ionospheric GPS-derived TEC measurements could complement the currently working systems, or independent ionospherically based system might be developed in the future.Citation: Astafyeva, E., L. Rolland, P. Lognonne´, K. Khelfi, and T. Yahagi (2013), Parameters of seismic source as deduced from 1 Hz ionospheric GPS data: Case study of the 2011 Tohoku-oki event,

Dynamics of vertical ionospheric inhomogeneities over Irkutsk during 06:00–06:20UT 11/03/2011 caused by Tohoku earthquake

“…Ionospheric effects of the Tohoku earthquake are currently the subject of many papers. Above all, it is papers analyzing data from dense networks of GPS-receivers, located on the Asian territory (Akhoondzadeh, 2012;Kakinami et al, 2011;Astafyeva et al, 2013;Hao et al, 2012;Komjathy et al, 2012;Liu, 2012;Occhipinti et al, 2011;Ogawa et al, 2012;Ouzounov et al, 2011;Saito et al, 2011;Tsugawa et al, 2011) and data from the SuperDARN radar, located on the Hokkaido island (Nishitani et al, 2011;Ogawa et al, 2012). These instruments have the best temporal resolution -from several seconds to 2 minutes, enabling to monitor the highly dynamic processes.…”

First results of registering ionospheric disturbances obtained with SibNet network of GNSS receivers in active space experiments

“…During the experiments on detection of ionospheric effects of active influence of Progress CS jet stream, we employed a method of mapping ionospheric disturbances [Perevalova et al, 2008;Tsugawa et al, 2011;Kunitsyn et al, 2011;Perevalova et al, 2012;Afraimovich et al, 2013;Astafyeva et al, 2013]. The method means that for each current moment the position of ionospheric points is plotted on a map for all receiversatellite rays, and the color of points corresponds to the current value of TEC variation amplitude in this ray, which is an indicator of ionospheric disturbances.…”

“…The method of mapping ionospheric disturbances, which has been repeatedly used for detecting TIDs [Perevalova et al, 2008;Tsugawa et al, 2011;Kunitsyn et al, 2011;Perevalova et al, 2012;Afraimovich et al, 2013;Astafyeva et al, 2013;Yasyukevich et al, 2015;Zakharov et al, 2016], has demonstrated its effectiveness in detection of local disturbances. We have identified relatively weak and vertically localized disturb-ances caused by the effect of the Progress spacecraft engine in the April 16, 2014 experiment.…”

“…It was oriented so that its jet stream was directed toward ground-based instruments. The purpose of the experiment was to detect and simultaneously record jet-induced effects with various geophysical instruments [Lebedev et al, 2014;Lipko et al, 2016;Klunko et al, 2016;Beletsky et al, 2016;Shpynev et al, 2017]. Along with other instruments, a new regional network of GNSS stations (SibNet), developed in ISTP SB RAS, was used to record effects of operation of CS engines.…”

Choice of optimum heights for registration of ionospheric response onto earthquakes

“…It is offered to use this kind of observations in tsunami warning systems, and also during monitoring of earth (sea) surface motion in region, which is difficult of access (for example, [1,2]). The principal disadvantage of this method is integrated character of a measurable value of TEC along trajectory of a radio wave (for example, [3]). However, the assumption is accepted that the main contribution to TEC variations appears around the height of the maximum of ionosphere ionization (F2 layer).…”