Geomagnetic variations possibly associated with the Pisco earthquake on 15 August 2007, Peru

Takla, E. M.; Yumoto, K.; Ishitsuka, J.; Rosales, Domingo; Dutra, S. L. G.; Уозуми, Т.; Abe, Shuji

doi:10.1016/j.tecto.2011.12.008

Cited by 13 publications

(17 citation statements)

References 27 publications

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“…Takla et al . [] show anomalous long‐term preearthquake changes during 2007–2008 in the Pc3 band (22–100 mHz) of magnetic data from the Ancon station. This period includes two earthquakes off the coast of Peru: the 15 August 2007 M 8 Pisco earthquake (180 km from Ancon) and the 29 March 2008 M 5.3 earthquake occurred (50 km from Ancon).…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

“…Takla et al . [] claim that long‐term preearthquake changes were present in the amplitude of the geomagnetic field components, as well as in the spectral polarization ratio.…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

“…Figure shows the amplitude (daily values and 10 day running mean) of the geomagnetic field components H Pc3 (north‐south), D Pc3 (east‐west), and Z Pc3 (vertical) as reported by Takla et al . []. They hypothesize that the long‐term increase between the end of 2007 and the beginning of 2008 of each component was related to the 29 March 2008 earthquake.…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

“…Daily values (blue line) and 10 day running mean (red line) of the amplitude of the geomagnetic field components H , D , and Z in the Pc3 band of frequency as reported by Takla et al . [, Figure 9] at the time of the 2007–2008 Peru earthquakes. The Σ Kp index ±5 day running mean is superposed onto each panel of the original view.…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

“…In Figure we show the polarization ratio Z Pc3 /H Pc3 as reported by Takla et al . []. They claim that the long‐term decrease in Z Pc3 /H Pc3 prior to the two earthquakes had a seismogenic origin.…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

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Are there new findings in the search for ULF magnetic precursors to earthquakes?

Masci

Thomas

2015

JGR Space Physics

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Moore (1964) in a letter published in Nature reported disturbances in geomagnetic field data prior to the 27 March 1964 Alaska earthquake. After the publication of this report, many papers have shown magnetic changes preceding earthquakes. However, a causal relationship between preearthquake magnetic changes and impending earthquakes has never been demonstrated. As a consequence, after 50 years, magnetic disturbances in the geomagnetic field are still candidate precursory phenomena. Some researchers consider the investigation of ultra low frequency (ULF: 0.001–10 Hz) magnetic data the correct approach for identifying precursory signatures of earthquakes. Other researchers, instead, have recently reviewed many published ULF magnetic changes that preceded earthquakes and have shown that these are not actual precursors. The recent studies by Currie and Waters (2014) and Han et al. (2014) aim to provide relevant new findings in the search for ULF magnetic precursory signals. However, in order to contribute to science, alleged precursors must be shown to be valid and reproducible by objective testing. Here we will briefly discuss the state of the art in the search for ULF magnetic precursors, paying special attention to the recent findings of Currie and Waters (2014) and Han et al. (2014). We do not see in these two reports significant evidence that may support the observation of precursory signatures of earthquakes in ULF magnetic records.

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Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

“…Takla et al . [] claim that long‐term preearthquake changes were present in the amplitude of the geomagnetic field components, as well as in the spectral polarization ratio.…”

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

Section: Are Magnetic Polarization Ratio Anomalies Credible Precursormentioning

confidence: 99%

See 3 more Smart Citations

Are there new findings in the search for ULF magnetic precursors to earthquakes?

Masci

Thomas

2015

JGR Space Physics

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The 2011 eruption of Aso volcano, Japan, and its signature on the geomagnetic field measurements

et al. 2015

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Possible connection between solar activity and local seismicity

Takla

Samwel

2023

Terr Atmos Ocean Sci

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Recently, much attention has been paid to the relationship between solar and seismic activities toward earthquake (EQ) prediction. Some researchers believe in the existence of a connection between them; however, others completely refuse the existence of such a connection. In this study, the correlation between solar disturbances and occurrence of EQs during two consecutive solar cycles (SCs) 23 & 24 from 1996 to 2019 was investigated to explore such a relationship. The study was performed on both global and local scales. On a global scale, we studied the temporal variations of EQs number and the corresponding solar activity, represented by sunspot number. On the other hand, we selected several seismic zones characterized with high seismic activities and shallow depth EQs. For each zone we examined the day-to-day variations in the number of EQs and explored the space weather “chain of action” from the Sun to Earth in order to examine whether these events have an influence to increase the number of EQs or not. Results showed that, for the whole global seismicity, no clear correlation is found between EQs occurrence and solar activity, while for small active seismic zones, the connection between them is significant. An increase in the number of shallow EQs in the studied seismic zones is observed in association with the variations of examined space weather indices. Thus, the current study suggests a possible connection between solar activity and localized seismic activities. However, the solar-magnetosphere-lithosphere coupling and interaction during solar events need further study and investigation for a better understanding of their EQ triggering effects.

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Geomagnetic variations possibly associated with the Pisco earthquake on 15 August 2007, Peru

Cited by 13 publications

References 27 publications

Are there new findings in the search for ULF magnetic precursors to earthquakes?

Are there new findings in the search for ULF magnetic precursors to earthquakes?

The 2011 eruption of Aso volcano, Japan, and its signature on the geomagnetic field measurements

Possible connection between solar activity and local seismicity

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