The study of the electromagnetic anomalies linked with the Earth's crustal activity in the frequency band [0.001 Hz–100 kHz]

Palangio, P.; Lorenzo, C. Di; Masci, F.; Persio, M. Di

doi:10.5194/nhess-7-507-2007

Cited by 13 publications

(11 citation statements)

References 9 publications

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“…Main interest is on the electrical parameters and especially the electrical resistivity of ground layers. Palangio et al (2007) reported a calculation of the ground resistivity profile for L'Aquila station by means of the single station magnetotelluric tensor evaluation. Several layers from 0-50 km depth show an increase of the electrical resistivity at d ∼ 2 km depth from σ ∼ 10-2000 m −1 .…”

Section: Ulf Analysis Related To Seismic Activitymentioning

confidence: 99%

Ultra Low Frequency (ULF) European multi station magnetic field analysis before and during the 2009 earthquake at L'Aquila regarding regional geotechnical information

Prattes

Schwingenschuh

Eichelberger

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. This work presents ground based Ultra Low Frequency (ULF) magnetic field measurements in the frequency range from 10-15 mHz from 1 January 2008 to 14 April 2009. In this time period a strong earthquake series hit the Italian Abruzzo region around L'Aquila with the main stroke of magnitude M = 6.3 on 6 April 2009. In the frame of the South European Geomagnetic Array (SEGMA), a European collaboration runs ULF fluxgate instruments providing continuously magnetic field data recorded in mid-and south Europe. The main scientific objective is the investigation of signal variations due to seismic activity and the discrimination between other natural and human influences. The SEGMA station closest to the L'Aquila earthquake epicenter is L'Aquila observatory located in the epicenter region. For the scientific analysis we extract the nighttime period from 22:00-02:00 UT and determine the power spectral density (PSD) of the horizontal (H ) and vertical (Z) magnetic field components and the standardized polarization ratio (Z) over (H ). To discriminate local emissions from global geomagnetic effects, data from three SEGMA stations in distances up to 630 km from the epicenter region are analyzed and further compared to the independent global geomagnetic K p index. Apart from indirect ionospheric effects, electromagnetic noise could be originated in the lithosphere due to tectonic mechanisms in the earthquake focus. To estimate Correspondence to: G. Prattes (gustav.prattes@oeaw.ac.at) the amplitude of assumed lithospheric electromagnetic noise emissions causing anomalies in the PSD of the (Z) component, we consider magnetotelluric calculations of the electric crust conductivity in the L'Aquila region. Results found at L'Aquila observatory are interpreted with respect to the lithosphere electrical conductivity in the local observatory region, the K p index, and further in a multi station analysis. Possible seismic related ULF anomalies occur ∼2 weeks before the main stroke.

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Section: Ulf Analysis Related To Seismic Activitymentioning

confidence: 99%

Ultra Low Frequency (ULF) European multi station magnetic field analysis before and during the 2009 earthquake at L'Aquila regarding regional geotechnical information

Prattes

Schwingenschuh

Eichelberger

et al. 2011

Nat. Hazards Earth Syst. Sci.

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show abstract

“…Our analysis is based on differential measurements between the two permanent observatories of L'Aquila and Duronia in order to minimize the contamination from multiple sources, such as the local background noise and the magnetic field of external origin. Many experimental and theoretical studies on the electromagnetic phenomena associated with earthquakes in the frequency range from ULF to HF have been reported, see Varotsos et al, 1984a, b, Bernardi et al, 1991Fenoglio et al, 1995;Fraser-Smith et al, 1990, 1993Gershenzon et al, 1989;Gokhberg et al 1982;Hayakawa et al, 1996;Johnston et al, 1987Johnston et al, , 1989Johnston et al, , 1994Johnston et al, , 1997Merzer et al, 1997;Molchanov et al, 1992Molchanov et al, , 1995Nagano et al, 1975;Parrot et al, 1989;Park et al, 1991Park et al, , 1993Palangio et al, 2007Palangio et al, , 2008. These studies focus on different aspects including variations in quasi-static electric and magnetic fields, telluric potentials, ULF magnetic fields, alternating electric fields in the ULF, ELF and VLF bands, and variations in the ground resistivity.…”

Section: Introductionmentioning

confidence: 99%

Non-inductive components of electromagnetic signals associated with L'Aquila earthquake sequences estimated by means of inter-station impulse response functions

Lorenzo

Palangio

Santarato

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. On 6 April 2009 at 01:32:39 UT a strong earthquake occurred west of L'Aquila at the very shallow depth of 9 km. The main shock local magnitude was M l = 5.8 (Mw = 6.3). Several powerful aftershocks occurred the following days. The epicentre of the main shock occurred 6 km away from the Geomagnetic Observatory of L'Aquila, on a fault 15 km long having a NW-SE strike, about 140 • , and a SW dip of about 42 • . For this reason, L'Aquila seismic events offered very favourable conditions to detect possible electromagnetic emissions related to the earthquake. The data used in this work come from the permanent geomagnetic Observatories of L'Aquila and Duronia. Here the results concerning the analysis of the residual magnetic field estimated by means of the inter-station impulse response functions in the frequency band from 0.3 Hz to 3 Hz are shown.

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“…Rd adalah radius manifestasi dalam satuan km, 0,43 adalah konstanta, dan M magnitude gempabumi [15].…”

Section: 43m (1)unclassified

Analisis Gelombang Elektromagnetik dan Seismik yang Ditimbulkan oleh Gejala Gempa

Timor

Andre²,

Hazmi³

2016

JNTE

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Abstrak-Gempa bumi adalah fenomena alam yang sulit diprediksi kapan dan bagaimana akan terjadi. Diperlukan usaha untuk meminimalisir resiko gempa bumi, seperti pengamatan tanda tanda awal sebelum gempabumi terjadi (prekursor). Penelitian ini dilakukan untuk mengamati kejadian gempa di Sumatera Barat melalui dua cara. Pengamatan gelombang eleketromagnetik memanfaatkan gelombang radio dari dua stasiun. Penelitian juga menggunakan sensor gelombang seismic yang ditempatkan di jurusan Teknik Elektro, Universitas Andalas. Berdasar hasil pengolahan data dari transmisi gelombang radio, maka diketahui bahwa anomaly elektromagnetik dapat direkam dengan memanfaatkan propagasi gelombang radio. Namun propagasi dengan line of sight banyak menimbulkan rugi-rugi propagasi, dan kurang efektif dalam perekaman. Untuk rekaman gempa melalui gelombang seismik sangat baik. Hasil pengukuran untuk arah pusat gempa dibandingkan dengan hasil pengukuran BMKG untuk beberapa kejadian gempa akhir tahun 2013 yang dirasakan di Sumatera Barat. Adapun error rata-rata pengukuran yang didapat 9.6% karena dipengaruhi oleh keakurasian delay phasa alat sensor. Kata kunci: Gempa bumi, Elektromagnetik, SeismikAbstract-Earthquakes are a natural phenomenon which is difficult to predict when and how it will happen. Effort is needed to minimize the risk of earthquakes, such as the observation of the early signs before an earthquake occurs (precursor). This study was conducted to observe earthquakes in West Sumatra in two ways. Observations eleketromagnetik waves utilizing radio waves from the two stations. The study also uses seismic wave sensors that are placed in the Department of Electrical Engineering, University of Andalas. Based on the results of data processing of the transmission of radio waves, it is known that electromagnetic anomalies can be recorded by utilizing radio wave propagation. However, with the line of sight propagation cause a lot of loss propagation, and less effective in recording. For the recording of the earthquake through the seismic waves very well. The measurement results for the direction of the epicenter compared with the measurement result BMKG for some earthquakes end of 2013 were felt in the West Sumatra. The average error of measurement gained 9.6% since the phase delay is affected by the accuracy of the sensor device.

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The study of the electromagnetic anomalies linked with the Earth's crustal activity in the frequency band [0.001 Hz–100 kHz]

Cited by 13 publications

References 9 publications

Ultra Low Frequency (ULF) European multi station magnetic field analysis before and during the 2009 earthquake at L'Aquila regarding regional geotechnical information

Ultra Low Frequency (ULF) European multi station magnetic field analysis before and during the 2009 earthquake at L'Aquila regarding regional geotechnical information

Non-inductive components of electromagnetic signals associated with L'Aquila earthquake sequences estimated by means of inter-station impulse response functions

Analisis Gelombang Elektromagnetik dan Seismik yang Ditimbulkan oleh Gejala Gempa

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