A new ULF wave analysis for Seismo-Electromagnetics using CPMN/MAGDAS data

Yumoto, K.; Ikemoto, Shun; Cardinal, M. G.; Hayakawa, Masashi; Hattori, Katsumi; Liu, J.Y.; Saroso, Sarmoko; Ruhimat, Mamat; Husni, Muhammad; Widarto, Djedi S.; Ramos, Emmanuel G.; McNamara, Daniel J.; Otadoy, R. E. S.; Yumul, Graciano P.; Ebora, R.; Servando, N.

doi:10.1016/j.pce.2008.04.005

Cited by 33 publications

(40 citation statements)

References 15 publications

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“…But here we got a conviction in which each earthquake occurrence by using spectrum analysis on each component found an intensity anomaly where if there is interference with geomagnetic disturbances external to the component response intensity H has a higher frequency than the component Z. we using Dst Index for control geomagnetic activity in low latitude [11] We compare with two station references DAV and DAW but unfortunately DAV have not data. And result look onset 2 day before event.…”

Section: Resultsmentioning

confidence: 97%

Determination of the onset time in polarization power ratio Z/H for precursor of Sumatra earthquake

Ahadi¹,

Puspito²,

Ibrahim³

et al. 2014

AIP Conference Proceedings

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Abstract. Determination of onset time precursors of strong earthquakes (Mw > 5 ) and distance (d < 500 km ) using geomagnetic data from Geomagnetic station KTB, Sumatra and two station references DAV, Philippine and DAW, Australia. separate techniques are required in its determination . Not the same as that recorded in the kinetic wave seismograms can be determined by direct time domain. Difficulties associated with electromagnetic waves seismogenic activities require analysis of the transformed signal in the frequency domain. Determination of the frequency spectrum will determine the frequency of emissions emitted from the earthquake source. The aim is to analyze the power amplitude of the ULF emissions in the horizontal component ( H ) and vertical component ( Z ). Polarization power ratio Z / H is used for determining the sign of earthquake precursors controlled by the standard deviation. The pattern recognition polarization ratio should be obtained which can differentiate emissions from seismogenic effects of geomagnetic activity. ULF emission patterns generated that seismogenic effect has duration > 5 days and the dominance of emission intensity recorded at the Z component and for the dominance of the emission intensity of geomagnetic activity recorded in the component H. The result shows that the onset time is determined when the polarization power ratio Z / H standard deviation over the limit ( p ± 2  ) which has a duration of > 5 days .

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Section: Resultsmentioning

confidence: 97%

Determination of the onset time in polarization power ratio Z/H for precursor of Sumatra earthquake

Ahadi¹,

Puspito²,

Ibrahim³

et al. 2014

AIP Conference Proceedings

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“…Penelitian ini fokus pada identifikasi nilai dan rentang waktu anomali sinyal EM terhadap parameter gempabumi yang terekam di Observatori Pelabuhan Ratu tahun 2013. Penelitian ini merupakan pengembangan dari metode yang diperkenalkan oleh Yumoto and The MAGDAS Group [1], yaitu pengamatan rasio polarisasi magnetik dan impedansi EM dari litosfer yang berkaitan dengan gempabumi [3], sehingga selanjutnya bisa diketahui tren korelasi anomali terhadap magnitude gempabumi dan jarak stasiun dengan hiposenter gempabumi (Rhypo).…”

Section: Gambar 1 Lai Couplingunclassified

“…Data EM terdiri atas komponen listrik Ex dan Ey, serta komponen magnetik Hx, Hy, dan Hz. Rasio komponen listrik terhadap komponen magnet (E/H) dikenal sebagai impedansi EM yang nilainya sebanding dengan resistivitas medium atau batuan sebagai fungsi kedalaman [3]. Dalam penelitian juga digunakan data Disturbance Storm Time (DST) index pada periode yang sama dengan data EM.…”

Section: Metode Penelitianunclassified

“…Diperlukan usaha untuk meminimalisir resiko gempabumi, seperti pengamatan tandatanda awal sebelum gempabumi terjadi (prekursor). Penelitian prekursor gempabumi telah banyak dilakukan dengan hasil bervariasi [1][2][3][4]. Munculnya variasi membuat penelitian tentang prekursor gempabumi memerlukan metode, waktu dan pengolahan data yang bervariasi [1,2].…”

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“…[1,6] Secara fisika, jika material diberi tekanan atau stress, maka sifat material akan mengalami perubahan yang dapat diamati secara berkala. Contohnya adalah sifat magnetik, radioaktifitas, resistivitas, komposisi elektron, suhu dan banyak lainnya [2,3]. Dengan demikian, jika material dalam lapisan bumi mengalami tekanan akibat aktifitas seismik seperti microfracturing dan gaya elektrokinetis yang nantinya dapat diikuti dengan pelepasan energi dalam bentuk gempabumi, maka sifat material tersebut akan berubah drastis menjadi lebih tinggi atau lebih rendah dari kondisi normal.…”

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Anomalious Trends in Electromagnetic As Earthquake Precursors With Related Parameters at the Port Ratu Observatory

Prayogo

Sunardi

2015

Nat-B

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ABSTRAKPenelitian tentang anomali elektromagnetik sebagai prekursor gempabumi telah banyak dilakukan. Untuk validasi, perlu dilakukan analisis korelasi antara nilai dan jarak waktu terjadinya anomali dengan gempabumi, khususnya gempabumi yang tercatat di Observatori Pelabuhan Ratu dan memiliki anomali elektromagnetik. Penelitian ini bertujuan untuk menganalisa korelasi pola anomali dan rentang waktunya terhadap magnitudo dan Rhypo. Pengolahan data menggunakan metode rasio polarisasi dan impedansi elektromagnetik pada spektrum frekuensi ultra rendah, sedangkan metode korelasinya menggunakan analisis trendline kaitan fisis antar parameter. Data yang digunakan adalah data elektromagnetik dan data gempabumi yang tercatat di Observatori Pelabuhan Ratu. Hasil pengolahan elektromagnetik dengan metode polarisasi magnetik menunjukkan nilai anomali elektromagnetik yang antara 0,1 sampai dengan 9,5 demikian pula rentang waktu terjadinya anomali antara 4 sampai 39 hari sebelum gempabumi. Nilai anomali elektromagnetik dengan metode impedansi bervariasi antara 3,01 sampai 16,1. Rentang waktu terjadinya berkisar antara 4 sampai 32 hari sebelum gempabumi. Kesimpulannya, diketahui bahwa korelasi nilai dan rentang munculnya anomali terhadap magnitude dan jarak Rhypo dengan metode polarisasi magnetik menunjukkan korelasi positif, sedangkan korelasi dengan metode impedansi, cenderung negatif. Korelasi negatif juga didapat pada hubungan Rhypo dan magnitud terhadap rentang waktu dan nilai anomali polarisasi. Kata kunci : Elektromagnetik, Prekursor Gempabumi, Korelasi ABSTRACTResearch on electromagnetic anomalies as earthquake precursor was performed in many places and time. Pelabuhan Ratu Observatory. For validation, correlation between anomaly value and time length with earthquake that recorded at Pelabuhan Ratu Geophysical Observatory and have electromagnetic anomaly. Goals of this research were analyze correlation between anomaly pattern value and time length to earthquake magnitud and Rhypo. Data processed by polarization ratio and impedance of electromagnetic at ultra low frequency spectrum, the correlation method using regression and physical analysis between parameter. Data that used was electromagnetic and earthquake data that recorded and perceived at geophysical observatories of Pelabuhan Ratu. Results of electromagnetic anomaly value with magnetic polarization ratio was varies in 0.1 until 9.5, and also time length between 4 until 39 days before earthquake. Value of anomaly with impedance method was varies in 3.01 until 16.1, and also time length between 4 until 32 days before earthquake. In conclusion, known that trend correlation of the appearance of anomalous values and ranges of magnitude and distance Rhypo with magnetic polarization method showed a positive correlation, whereas a negative correlation with the impedance method. Negative correlation also obtained on relationship between Rhypo and magnitude of the span of time and the value of the polarization anomaly.

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On the use of geomagnetic indices and ULF waves for earthquake precursor signatures

Currie

Waters

2014

JGR Space Physics

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Ultralow frequency (ULF: 0.001–5 Hz) magnetic records have recently been used in the search for short‐term earthquake prediction methods. The separation of local and global effects in the magnetic records is the greatest challenge in this research area. Geomagnetic indices are often used to predict global ULF magnetic behavior where it is assumed that increases in a geomagnetic index correspond with an increase in ULF power. This paper examines the relationships between geomagnetic indices and ULF power, spectral polarization ratio, and the relationship between the spectral polarization ratio and solar wind parameters. The power in the ULF, Pc3‐5 bands (10–600 s), shows a linear correlation coefficient of 0.2 with the Kp magnetic activity index. The correlation varies with magnetic local time (MLT) and latitude. The correlation coefficient is inversely related to the integrated power in the ULF Pc3 band (10–45 s) over MLT and magnetic latitude. The ratio of spectral powers Z(ω)/G(ω) is discussed and shown to be a promising parameter in the search for earthquake precursor signals in ULF records.

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A new ULF wave analysis for Seismo-Electromagnetics using CPMN/MAGDAS data

Cited by 33 publications

References 15 publications

Determination of the onset time in polarization power ratio Z/H for precursor of Sumatra earthquake

Determination of the onset time in polarization power ratio Z/H for precursor of Sumatra earthquake

Anomalious Trends in Electromagnetic As Earthquake Precursors With Related Parameters at the Port Ratu Observatory

On the use of geomagnetic indices and ULF waves for earthquake precursor signatures

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