The Seismic Electromagnetic Emissions During the 2010 Mw 7.8 Northern Sumatra Earthquake Revealed by DEMETER Satellite

Zhima, Zeren; Hu, Yunpeng; Piersanti, Mirko; Shen, Xuhui; Santis, Angelo De; Yao, Rui; Yang, Yanchu; Zhao, Shufan; Zhang, Zhenxia; Wang, Qiao; Huang, Jianping; Guo, Feng

doi:10.3389/feart.2020.572393

Cited by 16 publications

(16 citation statements)

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“…The bottom-right global map shows the orbit project and the epicenter. Alternatively, the orbits passing through the epicenter areas are plotted as scatter values of different physical values along the orbit traces, as Figure 2 of Zhima et al [13], which shows the abnormal enhancement of the power spectral density values in the frequency range from 300 to 800 Hz of the magnetic field. The third panel shows the information of EQs that occurred along the current orbit trajectory within one month; the y-axis represents the direct distance between the epicenters and the satellite footpoint; the square, circle, and triangle denote the EQs that occurred before, during, and after the time of the current orbit, respectively; and the EQ magnitude indicates the size of the square, circle, and triangle.…”

Section: Single Orbit Analysismentioning

confidence: 99%

“…Abnormal electromagnetic emissions in a broad frequency range were observed over the epicenter zones or their conjugated points during the impending earthquake time [11][12][13][14]. Nemec et al [14] statistically evaluated the abnormal electromagnetic field before M 4.8+ shallow-depth EQs by using 3.5 years of DEMETER data and confirmed the existence of a very small but statistically significant decrease in the electromagnetic wave intensity before the mainshock time.…”

Section: Introductionmentioning

confidence: 98%

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The Possible Seismo-Ionospheric Perturbations Recorded by the China-Seismo-Electromagnetic Satellite

et al. 2022

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Driven by the objective of earthquake disaster prevention and mitigation, China launched the Zhangheng mission to build a stereoscopic earthquake monitoring system from the lithosphere to space. This report briefly presents the possible seismic ionospheric disturbances recorded by the first probe of the Zhangheng mission, which is known as the China-Seismo-Electromagnetic Satellite (CSES). The routine data preprocessing and seismo-ionospheric information analysis methods are briefly introduced. The possible seismo-ionospheric disturbances that appeared during the strong shallow earthquakes (with a magnitude over 7 and a depth shallower than 30 km) are analyzed by using CSES and other multi-source data. Investigating seismo-ionospheric mechanisms requires multidisciplinary knowledge involving geophysics, atmosphere/ionosphere physics, geochemistry/atmospheric chemistry, etc. We state that the results from the CSES scientific application center are preliminary, calling for international scientists to contribute to the seismo-ionospheric perturbation phenomena, which is one of the most challenging scientific problems.

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Section: Single Orbit Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

The Possible Seismo-Ionospheric Perturbations Recorded by the China-Seismo-Electromagnetic Satellite

et al. 2022

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“…Aktivitas seismik sebelum terjadi gempa bumi ditandai dengan adanya anomali medan magnetik serta kerapatan elektron (De Santis, dkk, 2019), dan/atau anomali gradien potensial medan listrik (Smirnov, 2020). Emisi EM sebelum gempa bumi terjadi berada pada rentang frekuensi hertz hingga megahertz (Mullayarov, dkk, 2014) (Petraki, dkk, 2015) (Zhima, dkk, 2020).…”

Section: Pendahuluanunclassified

Penerima Gelombang ELF berbasis Op-Amp untuk Pengolahan Akuisisi Data Gempa Bumi

et al. 2021

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ABSTRAKPenelitian ini membahas mengenai penerima gelombang extremely low frequency (ELF) untuk pengolahan akuisisi data gempa bumi. Penerima ELF dirancang menggunakan operational amplifier (Op-Amp) dengan masukan takmembalik. Sinyal yang diterima oleh antena diteruskan ke penerima ELF yang terdiri dari preamplifier dan amplifier untuk proses penguatan, serta filter aktif orde 2 untuk menekan sinyal di atas frekuensi cut-off sebesar 50Hz. Karakterisasi penerima ELF dilakukan dengan mengamati perbandingan level tegangan sinyal keluaran terhadap level tegangan sinyal masukan, sensitivitas, serta bentuk sinyal keluaran dari penerima ELF dalam domain waktu. Hasil simulasi menunjukkan bahwa penerima ELF menghasilkan penguatan sebesar 60,8dB dengan sensitifitas tinggi untuk level sinyal masukan di bawah -30dB yang mampu memenuhi level sinyal untuk pengolahan akuisisi data.Kata kunci: extremely low frequency, penerima ELF, operational amplifier, filter aktif, gempa bumi ABSTRACTThis research presents extremely low frequency (ELF) receiver for earthquake data acquisition processing. The ELF receiver is designed based on non-inverting operational amplifier (Op-Amp). The signal received by the antenna is fed into ELF receiver which consists of preamplifier and amplifier for amplification, and second order active filter to suppress unwanted signal above the cut-off frequency of 50Hz. Characterization of ELF receiver is performed by observing the comparison of the level output signal to level input signal, sensitivity, and ELF receiver signal output in time domain. The simulation results show that the ELF receiver has gain of 60.8dB with high sensitivity for low level input signals below -30dB that is able to meet signal level for data acquisition processing.Keywords: extremely low frequency, ELF receiver, operational amplifier, active filter, earthquake

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“…With the development of the Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) model, the study of seismoionospheric anomalies has attracted more and more attention (Hayakawa and Molchanov, 2002;Pulinets and Ouzounov, 2011;De Santis et al, 2015Shen et al, 2018;Li et al, 2019;Fu et al, 2020;Zhima et al, 2020). Recently, a substantial amount of satellite observation data are used to study the ionosphere anomalies before large earthquakes (Pulinets and Boyarchuk, 2005;Ho et al, 2018;Natarajan and Philipoff, 2018;Marchetti et al, 2019c;Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Swarm Satellite Magnetic Field Data Before the 2016 Ecuador (Mw = 7.8) Earthquake Based on Non-negative Matrix Factorization

Zhu

Fan

et al. 2021

Front. Earth Sci.

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In this paper, based on non-negative matrix factorization (NMF), we analyzed the ionosphere magnetic field data of the Swarm Alpha satellite before the 2016 (Mw = 7. 8) Ecuador earthquake (April 16, 0.35°N, 79.93°W), including the whole data collected under quiet and disturbed geomagnetic conditions. The data from each track were decomposed into basis features and their corresponding weights. We found that the energy and entropy of one of the weight components were more concentrated inside the earthquake-sensitive area, which meant that this weight component was more likely to reflect the activity inside the earthquake-sensitive area. We focused on this weight component and used five times the root mean square (RMS) to extract the anomalies. We found that for this weight component, the cumulative number of tracks, which had anomalies inside the earthquake-sensitive area, showed accelerated growth before the Ecuador earthquake and recovered to linear growth after the earthquake. To verify that the accelerated cumulative anomaly was possibly associated with the earthquake, we excluded the influence of the geomagnetic activity and plasma bubble. Through the random earthquake study and low-seismicity period study, we found that the accelerated cumulative anomaly was not obtained by chance. Moreover, we observed that the cumulative Benioff strain S, which reflected the lithosphere activity, had acceleration behavior similar to the accelerated cumulative anomaly of the ionosphere magnetic field, which suggested that the anomaly that we obtained was possibly associated with the Ecuador earthquake and could be described by one of the Lithosphere–Atmosphere–Ionosphere Coupling (LAIC) models.

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The Seismic Electromagnetic Emissions During the 2010 Mw 7.8 Northern Sumatra Earthquake Revealed by DEMETER Satellite

Cited by 16 publications

References 50 publications

The Possible Seismo-Ionospheric Perturbations Recorded by the China-Seismo-Electromagnetic Satellite

The Possible Seismo-Ionospheric Perturbations Recorded by the China-Seismo-Electromagnetic Satellite

Penerima Gelombang ELF berbasis Op-Amp untuk Pengolahan Akuisisi Data Gempa Bumi

Analysis of Swarm Satellite Magnetic Field Data Before the 2016 Ecuador (Mw = 7.8) Earthquake Based on Non-negative Matrix Factorization

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