Observation evidences of atmospheric Gravity Waves induced by seismic activity from analysis of subionospheric LF signal spectra

Рожной, А.; Solovieva, M.; Molchanov, O. A.; Biagi, P. F.; Hayakawa, Masashi

doi:10.5194/nhess-7-625-2007

Cited by 67 publications

(37 citation statements)

References 7 publications

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“…The above ev i dence seems to in di cate that for earth quakes of M < 5.0 ex treme eigenvalues re sult ing from ap ply ing PCA to ion o spheric TEC could re sult from earth quakes but the ev i dence is in no way de fin i tive. These small ex treme ei genvalues could be at trib uted to any num ber of other pos si ble dis tur bances in the ion o sphere such as in ter nal ion o spheric fea tures, ra dio waves from the lower at mo sphere, and cosmic rays (Martynenko 1989;Space En vi ron ment Topic 1994, 1999Léna et al 1996;Tinsley 2000;Hocke and Tsuda 2001;Eriksson et al 2002;Sreehari and Nayar 2006;Iannotta 2007;Marusek 2007;Rozhnoi et al 2007). In the case of larger earth quakes, how ever, the cor re spond ing distur bance to the ion o sphere is on a scale large enough to negate the sig nif i cance of back ground dis tur bances from smaller earth quakes and other pos si ble ion o spheric dis turbances.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric Total Electron Content (TEC) Anomalies Associated with Earthquakes through Karhunen-Loéve Transform (KLT)

Lin¹

2010

Terr. Atmos. Ocean. Sci.

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AB STRACTThis re search uses eigenvalue char ac ter is tics of the Karhunen-Loéve Trans form of ion o spheric to tal elec tron con tent (TEC) to in ves ti gate pre cur sors for 12 earth quakes of Rich ter mag ni tude scale M ³ 5.0 in a lo cal re gion of lat i tude 23.00 to 24.00°N and lon gi tude 120.00 to 121.50°E for 1 January 2002 to 31 December 2003. Pre vi ous re search ers have found that in the 5 days be fore these earth quakes (i.e., prior to M ³ 5.0), pre cur sors of clear ion o spheric anom a lies show ing sparser to tal elec tron con tent (TEC) were de tected through sta tis ti cal in ves ti ga tion. This was ev i denced through two is sues from Liu and his part ners in 2001 and 2006. These is sues gave cred i ble ev i dence of such pre cur sors. The pre cur sor days hav ing clear ex treme eigenvalues of the Karhunen-Loéve Trans form as the pre cur sors in stead of the sparser ion o spheric TEC were also mostly in the 5 days be fore the 12 earth quakes of greater than M ³ 5.0. The pre cur sors of Chi-Chi Earth quake (M w = 7.6) with clear ex treme eigenvalues were de tected on the 1 st , 3 rd , and 4 th days be fore this earth quake. These re sults are con sis tent with the anal y ses of Liu and his part ner's is sue in 2001. These find ings ver ify the va lid ity of the Karhunen-Loéve Trans form. To fur ther ver ify this ap proach, the Karhunen-Loéve Trans form is ap plied to an earth quake in Ja pan. Pre cur sors to the Ja pan Iwate-Miyagi Nairiku earth quake (M j = 7.2), with clear ex treme eigenvalues are de tected on the 1 st , 2 nd , and 5 th days be fore the earth quake, re spec tively. How ever, af ter de tailed anal y sis, pre cur sors of earth quakes of Rich ter mag ni tude scale M < 5 are not easy to identify using extreme eigenvalues because of existence of other ionospheric features not caused by earthquakes.Key words: Pre cur sors, Karhunen-Loéve trans form, Ion o spheric to tal elec tron con tent (TEC), Tai wan Chi-Chi earth quake, Ja pan Iwate-Miyagi Nairiku earth quake Ci ta tion: Lin, J. W., 2010: Ion o spheric to tal elec tron con tent (TEC) anom a lies as so ci ated with earth quakes through Karhunen-Loéve Trans form (KLT).Terr. Atmos. Ocean. Sci., 21, 253-265, doi: 10.3319/TAO.2009.06.11.01(T) IN TRO DUC TIONTyp i cal tra di tional anal y ses of pre cur sors to earth quakes look at a va ri ety of phe nom ena such as en ergy re lease with elec tric and mag netic field dis tur bances and hot spring analyses (Kuo et al. 2006). How ever, such pre cur sors are not eas ily re corded and are sub ject to in tru sion by ra dio waves. In more re cent years, there has been a fo cus on the de tec tion of ion o spheric anom a lies in pre cur sor re search (Liu et al. 2001Pulinets 2004;Hegai et al. 2006;Heki et al. 2006;Liperovskaya et al. 2006;Hayakawa 2007). This body of re search has con firmed some ion o spheric anom a lies having re la tion ships with earth quakes, but such re la tion ships have not been suit ably math e mat i cally de scribed; they have re lied on ob ser va tional ana...

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Section: Discussionmentioning

confidence: 99%

Ionospheric Total Electron Content (TEC) Anomalies Associated with Earthquakes through Karhunen-Loéve Transform (KLT)

Lin¹

2010

Terr. Atmos. Ocean. Sci.

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“…2 in collaboration with Russian colleagues (Uyeda et al 2002;Molchanov and Hayakawa 2008) and another station in Taiwan (Hayakawa et al 2010c). Observations at PTK have been performed regularly resulting in significant scientific output (Rozhnoi et al 2004(Rozhnoi et al , 2007(Rozhnoi et al , 2012a. The Russian group has recently established one more station, Yuzhno-Sakhalinsk (abbreviated as YSH and shown as a green dot in Fig.…”

Section: Vlf/lf Subionospheric Networkmentioning

confidence: 99%

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Hayakawa¹,

Hobara²,

Рожной³

et al. 2013

Terr. Atmos. Ocean. Sci.

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By using network observation of subionospheric VLF (very low frequency)/LF (low frequency) signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) which occurred at sea proximate to the Tohoku area on the main island (Honshu) of Japan was an exceptionally huge plate-type EQ. A remarkable anomaly (with a decrease in the nighttime amplitude and also with enhancement in dispersion) was detected on March 5 and 6 along the propagation path from the NLK (Seattle, USA) transmitter to Chofu (together with Kochi and Kasugai). We also have observed the corresponding VLF anomaly during a prolonged period of March 1 -6, with minima in the nighttime amplitude on March 3 and 4 along the path from JJI (Miyazaki, Kyushu) to Kamchatka, Russia. This ionospheric perturbation has been discussed extensively with respect to its reliability. (1) How abnormal is this VLF/LF propagation anomaly? (2) What was the temporal evolution of terminator times? (3) Were there any solar-terrestrial effects (especially the effect from geomagnetic storms) on the VLF/LF propagation anomaly? (4) The effect of any other EQs and foreshock activities on the VLF/LF anomaly? (5) Were there any correlations with other related phenomena? Finally, (6) are there any other examples of a VLF/LF propagation anomaly for oceanic EQs? We then compared the temporal properties of ionospheric perturbations for this EQ with those of a huge number of inland EQs and compared the corresponding spatial scale with the former result of the same oceanic 2004 Sumatra EQ with nearly the same magnitude. Finally, the generation mechanism of those seismo-ionospheric perturbations is briefly discussed.

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“…Particularly, in our case a slow vertical propagation velocity of AGW can explain the 1-2 day delay of EQs effects relative to the events. One can expect the manifestations of AGW in the lower ionosphere (see, for example, Rozhnoi et al, 2007;Horie et al, 2007;Muto et Let's consider what variations of the AA can be expected under perturbations of the lower ionosphere. We used a simple but realistic model of electromagnetic wave propagation in the waveguide "earth-ionosphere", taking into account the damping of waves.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric effects of earthquakes in Japan in March 2011 obtained from observations of lightning electromagnetic radio signals

Mullayarov

Argunov

Abzaletdinova

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Manifestations of disturbances in the lower ionosphere caused by a complex series of earthquakes (the strong earthquakes with M = 7.3 and M = 9 -known as M9 Tohoku EQ -and the subsequent aftershocks) that occurred near the Japanese island of Honshu have been considered with the use of monitoring measurements of the amplitude of lightning electromagnetic signals (atmospherics) received at Yakutsk. Some data of one-point lightning location systems have been compared with the data of the WWLLN network.The analysis of hourly values variation of the atmospheric amplitude passing over the earthquake epicenters shows that during the initial period (the strong earthquakes on 9 March and 11 March) a typical pattern of variations was observed. It was manifested in the increased amplitude after both earthquakes. There were also possible precursors in the form of the increase in amplitude 12-14 days before the events. Though the focuses of these earthquakes were very close to each other, the registration of both precursors may indicate that both of the lithospheric processes developed to a certain extent independently.During all the days of the atmospheric amplitude enhancement the quasi-periodic variation trains were recorded. Together with the delay of earthquake effects relative to the time of the events, they may testify in favor of transferring the energy of lithospheric processes into the lower ionosphere by means of atmospheric gravity waves.

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Observation evidences of atmospheric Gravity Waves induced by seismic activity from analysis of subionospheric LF signal spectra

Cited by 67 publications

References 7 publications

Ionospheric Total Electron Content (TEC) Anomalies Associated with Earthquakes through Karhunen-Loéve Transform (KLT)

Ionospheric Total Electron Content (TEC) Anomalies Associated with Earthquakes through Karhunen-Loéve Transform (KLT)

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Ionospheric effects of earthquakes in Japan in March 2011 obtained from observations of lightning electromagnetic radio signals

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