Coseismic ionospheric disturbance of the large strike-slip earthquakes in North Sumatra in 2012: Mw dependence of the disturbance amplitudes

Cahyadi, Mokhamad Nur; Heki, Kosuke

doi:10.1093/gji/ggu343

Cited by 98 publications

(135 citation statements)

References 33 publications

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“…Co-seismic ionospheric disturbances (CIDs) are usually observed in TEC data shortly after large (M w > 6.5) earthquakes (see Perevalova et al, 2014;Cahyadi and Heki, 2015) as the response of the ionosphere to propagating atmospheric waves excited by the vertical motion of the ground or sea level Jin et al, 2015;Occhipinti et al, 2013). The amplitude and duration of a CID mainly depend on the earthquake magnitude (Astafyeva et al, 2013;Cahyadi and Heki, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The amplitude and duration of a CID mainly depend on the earthquake magnitude (Astafyeva et al, 2013;Cahyadi and Heki, 2015). In contrast, although there are several published papers that report ionospheric changes preceding large earthquakes (see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This value is too high for a CID generated by a moderate M w = 6.1 earthquake like that of L'Aquila. Cahyadi and Heki (2015) have shown that for moderate earthquakes the amplitude of the CID should be less than 1 % of the background TEC. Thus, considering that at the time of L'Aquila earthquake the background TEC over central Italy is ∼ 5 TECu (see Nenovski et al, 2015 Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the 1 h duration of the alleged CID seems too long as well. Note that a CID effect lasting from 1 to a few hours is observed only after very large earthquakes, and it usually appears as a resonant atmospheric oscillation of about 4 mHz (see Cahyadi and Heki, 2015) and not as a longlasting positive anomaly as shown in Nenovski et al (2015).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake

Masci

Thomas

Secan

2017

Nat. Hazards Earth Syst. Sci.

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Abstract. In a report published in Advances in Space Research, Nenovski et al. (2015) analyse ionospheric TEC (total electron content) data from GPS measurements around the time of the 6 April 2009 M w 6.1 L'Aquila (Italy) earthquake. According to the authors, TEC difference (DTEC) calculated from two GPS (Global Positioning System) receivers in central Italy shows a hump-like shape (an increase followed by a decrease) during the hours just before and shortly after the main shock. They maintain that the hump-like shape is anomalous and may be related to the earthquake. We show that the DTEC increase in the hours before the shock, as well as its subsequent slow decrease, does not have any characteristic that might support a possible relationship with the earthquake. We have also conducted our own independent analysis using the same GPS data analysed by Nenovski et al. (2015). We have found a diurnal variation in DTEC time series that shows hump-like shapes like that reported by Nenovski et al. (2015) throughout the investigated period. This demonstrates that the hump-like shape in DTEC close to the time of the 6 April earthquake is not anomalous and cannot be considered a possible earthquake-related effect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake

Masci

Thomas

Secan

2017

Nat. Hazards Earth Syst. Sci.

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“…TEC observations offer new insights into surface processes (e.g. uplift) during earthquake rupture (Rolland et al, 2013;Cahyadi & Heki, 2014) and tsunami generation (Artru et al, 2005;Occhipinti et al, 2013). These signals can also offer insights into crustal structure via observations of Rayleigh wave propagation (Ducic et al, 2003;Occhipinti et al, 2010;Rolland et al, 2011;Reddy & Seemala, 2015).…”

Section: Introductionmentioning

confidence: 99%

Characterizing Coseismic Ionospheric Disturbance for Surface-Rupturing Earthquakes

Lee¹

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Ionospheric and geomagnetic disturbances caused by the 2008 Wenchuan earthquake: A revisit

Hao

2015

JGR Space Physics

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Previous works have shown that coseismic ionospheric disturbances (CIDs) after the tsunamigenic 2011 Tohoku earthquake (Tohoku EQ, Mw9.1) covered a vast area and were observed thousands of kilometers away from the epicenter. For the purpose of making a comprehensive comparison between powerful oceanic and inland EQs, we conduct a retrospective investigation of CIDs and geomagnetic responses to the 2008 Wenchuan EQ (Mw7.9) using a combination of techniques, total electron content, HF Doppler, and ground magnetometer. It is the very first study to present CIDs recorded by different techniques at co‐located sites and profiled with regard to changes of both ionospheric plasma and current (geomagnetic field) simultaneously. The integrated observation also shows that (1) in the Wenchuan case, most of the ionospheric and geomagnetic disturbances were observed within 1000 km distance which is far less than the Tohoku case; (2) two groups of CIDs were found with maximum amplitudes in the direction of azimuth 150° and 135°, respectively; and (3) the geomagnetic changes were only registered by three magnetometers located to the east and southeast of the epicenter. All the facts indicate that the main directional lobe of Wenchuan EQ energy propagation is to southeast and perpendicular to the direction of the fault rupture, but this kind of directivity is not that distinct in the Tohoku case. We suggest that the different fault slip (inland or submarine) affecting the way of couplings of lithosphere with atmosphere may contribute to the discrepancies between the two events.

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Coseismic ionospheric disturbance of the large strike-slip earthquakes in North Sumatra in 2012: Mw dependence of the disturbance amplitudes

Cited by 98 publications

References 33 publications

On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake

On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake

Characterizing Coseismic Ionospheric Disturbance for Surface-Rupturing Earthquakes

Ionospheric and geomagnetic disturbances caused by the 2008 Wenchuan earthquake: A revisit

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