Possible association between anomalous geomagnetic variations and the Molise Earthquakes at Central Italy during 2002

Takla, E. M.; Yumoto, K.; Sutcliffe, P.; Nikiforov, V. M.; Marshall, R. A.

doi:10.1016/j.pepi.2010.12.003

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…Since the intensities of the geomagnetic field at the HLN and AMA stations are not the same, we added (plus or negative) certain values to the geomagnetic components (H, D, and Z) recorded at the AMA station in order to plot the two sets of geomagnetic data together in one plot (i.e., we just shifted the baseline of the AMA data). Recently, many studies have reported the occurrence of anomalous electromagnetic signals in different frequency ranges associated with the seismic activities ( [12,22,[25][26][27][28], among many others). Furthermore, the ULF signal observed in Taiwan (at about 130 km away from the epicenter of the Chi-Chi earthquake) was considered as a precursory signature for the Chi-Chi earthquake [29].…”

Section: Short-term Anomalous Fluctuations In the Geomagnetic Componementioning

confidence: 99%

“…The anomalous geomagnetic variations observed by ground-based measurements in association with earthquakes are generally accepted, and many studies have reported precursory phenomena (a few nT's) associated with some earthquakes (see [7][8][9][10][11][12], among many others). In general, the amplitude of the precursory anomalies can be correlated with the magnitude of the earthquakes (i.e., large precursory anomalies can be observed in association with large earthquakes) [13].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous Geomagnetic Variations Possibly Linked with the Taiwan Earthquake (Mw=6.4) on 19 December 2009

Takla

Yumoto

Liu

et al. 2011

International Journal of Geophysics

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On 19 December 2009, the eastern part of Taiwan at approximate depth of 45 km was struck by a strong earthquake (Mw = 6.4). The epicenter was located about 20 km away from the Hualien (HLN) station in Taiwan. By analyzing data from the HLN station and Amami Oshima (AMA) in Japan as a remote reference, the geomagnetic east-west (D) and vertical (Z) components recorded at the HLN station are showing no correlation with those at the AMA station in December 2009. Anomalous variations of ∼10-15 nT started about one week before the occurrence of the earthquake and lasted for about two weeks. Also, an enhanced ULF signal in the range of Pc 3 (10-40 s) was observed a few days before the onset of the earthquake. Moreover, the polarization ratio (Z/H (north-south component)) of the Pc 3 amplitude at the HLN station decreased a few days preceding the earthquake. The mechanism behind these anomalous variations is not fully understood. However, we expect that crustal stress perturbations and underground conductivity changes associated with the earthquake played an important role for generating such observed geomagnetic variations.

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Section: Short-term Anomalous Fluctuations In the Geomagnetic Componementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anomalous Geomagnetic Variations Possibly Linked with the Taiwan Earthquake (Mw=6.4) on 19 December 2009

Takla

Yumoto

Liu

et al. 2011

International Journal of Geophysics

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“…As MLR Observatory is situated near to the Carpathian electrical conductivity anomaly (CECA), the long period anomalies (V-shaped and reverse V-shaped) might be linked to electrical conductivity variations along the CECA, which forms not only a tectonic boundary, but which also represents a peculiar conducting channel, as an 'open gate' to the intermediate depth seismically active Vrancea zone [Stanica et al 2006;Stanica and Stanica 2007]. The same type of long-period magnetic anomaly was also reported by Takla et al [2011] prior to two crustal Mw 5.7 earthquakes that occurred in Italy in the Molise region on October 31 and November 1, 2002.…”

Section: Data Correlationsmentioning

confidence: 62%

“…the International Real-Time Magnetic Observatory Network, INTERMAGNET], and even some satellite-based systems [Lagoutte et al 2006, have been dedicated to the monitoring of the geomagnetic field over the last two decades. Several studies have reported the identification of possible anomalous magnetic signals prior to earthquake occurrences [Hayakawa and Fujinawa 1994, Stanica et al 2006, Stanica and Stanica 2007, 2009, Moldovan et al 2009, Yumoto et al 2009, Takla et al 2011, or increased numbers of seismic events after or during magnetic storms [Hayakawa et al 2002, Kessel et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Correlation of geomagnetic anomalies recorded at Muntele Rosu Seismic Observatory (Romania) with earthquake occurrence and solar magnetic storms

Moldovan

Plăcintă

Constantin

et al. 2012

Annals of Geophysics

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The study presents a statistical cross-correlation between geomagnetic anomalies, earthquake occurrence and solar magnetic storms. The working data are from: (i) geomagnetic field records from Muntele Rosu (MLR) Observatory, and from Surlari (SUA) and/or Tihany (THY) INTERMAGNET Observatories; (ii) seismic data for the Vrancea source zone; and (iii) daily geomagnetic indices from the NOAA/Space Weather Prediction Center. All of the geomagnetic datasets were recorded from 1996 to the present, at MLR, SUA or THY, and they were automatically corrected using a LabVIEW program developed especially for this purpose, highlighting the missing or bad data. Missing data blocks were completed with the last good measured value. After correction of the data, there were a number of issues seen regarding previous interpretations of the geomagnetic anomalies. Some geomagnetic anomalies identified as precursory signals were found to be induced either by increased solar activity or by malfunction of the data acquisition system, which produced inconsistent data, with numerous gaps. The MLR geomagnetic data are compared with the data recorded at SUA/THY and correlated with seismicity and solar activity. These 15 years of investigations cover more than a complete solar cycle, during which time the solar-terrestrial perturbations have fluctuated from very low to very high values, providing the ideal medium to investigate the correlations between the geomagnetic field perturbations, the earthquakes and the solar activity. The largest intermediate depth earthquake produced in this interval had a moment magnitude Mw 6.0 (2004) and provided the opportunity to investigate possible connections between local geomagnetic field behavior and local intermediate seismicity.

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“…Monitoring and studying the variations of Earth's magnetic field recorded at stations in the vicinity of the earthquake's epicenter can be an effective tool for detecting the anomalous geomagnetic signals linked with tectonic activities [9,[12][13][14][15][16][17] Thus, the technique used to detect the occurrence of any possible anomalous change of the diurnal geomagnetic variations associated with the seismic activity at Honshu Island is based on calculating, examining and the comparing the amplitude of the daily variations inside and outside the epicenteral region.…”

Section: Introductionmentioning

confidence: 99%

A Possible Influence of Seismic Activity on Diurnal Geomagnetic Variations

E.M¹,

Yoshikawa²,

Уозуми³

2018

J Geol Geophys

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Recent research has introduced some evidences referring to a possible connection between the variation in geomagnetic field measurements and seismic activities. Thus, the present study focuses on a certain seismic activity that occurred at the northern part of Honshu Island, Japan to find out its impact on the diurnal geomagnetic variations recorded at this region. The study of variability of daily geomagnetic variations amplitude at the northern part of Honshu Island; which is characterized by high seismic activities has introduced motivating results. Data analysis and processing indicate the presence of an unusual change in the diurnal variations amplitude in association with earthquake activity occurred on 24 March 2008 at the studied area. A remarkable anomalous behavior in the diurnal variations amplitude of the East-West horizontal geomagnetic component (D-component) was detected in the vicinity of the epicenter at the Tohno station compared with those recorded at the Kakioka geomagnetic observatory and other remote reference stations. This anomalous behavior is observed only during the day of the studied seismic event, which suggests a possible connection between the earthquake occurrence and the change of diurnal variations range. Moreover, since there were no significant external geomagnetic changes during the occurrence of earthquake as revealed from the Dst and Kp indices, the observed anomalous variability in the diurnal geomagnetic variations range of D-component can be considered as anomalous phenomenon linked with the studied seismic activity. Such anomalous phenomenon can be used for constructing earthquake warning systems.

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Possible association between anomalous geomagnetic variations and the Molise Earthquakes at Central Italy during 2002

Cited by 12 publications

References 13 publications

Anomalous Geomagnetic Variations Possibly Linked with the Taiwan Earthquake (Mw=6.4) on 19 December 2009

Anomalous Geomagnetic Variations Possibly Linked with the Taiwan Earthquake (Mw=6.4) on 19 December 2009

Correlation of geomagnetic anomalies recorded at Muntele Rosu Seismic Observatory (Romania) with earthquake occurrence and solar magnetic storms

A Possible Influence of Seismic Activity on Diurnal Geomagnetic Variations

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