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| Titel |
Statistical Analysis of earthquake-related ULF phenomena at Kakioka, Japan, during 2001-2010 |
| VerfasserIn |
Katsumi Hattori, Peng Han, Maiko Hirokawa, Jiancang Zhuang, Chie Yoshino, Chieh-Hung Chen, Jann-Yenq Liu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094190
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| Publikation (Nr.) |
 EGU/EGU2014-9588.pdf |
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| Zusammenfassung |
| In order to verify and clarify the ULF seismo-magnetic phenomena, a statistical
investigation of the relation between magnetic anomalies and local seismicity has been
performed. Geomagnetic data observed during 2001-2010 at the Kakioka station has been
analyzed. Energy of ULF geomagnetic signals at the frequency around 0.01Hz
has been investigated using wavelet transform analysis. To indentify anomalous
changes induced by Ionospheric disturbances, the Kanoya station has been chosen as a
reference station. Statistical studies based on the superposed epoch analysis have
indicated that before a sizeable earthquake there are clear higher probabilities of ULF
anomalies than that after the earthquake: statistical results of daily counts were found
significant at about 30 days before, 2 weeks before, 5-7 days before and 2 days after the
event. These results are somehow consistent with previous studies in Izu and Boso
Peninsulas, which suggests a correlation between ULF geomagnetic anomalies and
local seismicity. Further investigations on the Molchan error diagram indicate that
local ULF geomagnetic anomaly do contain precursory information of sizeable
earthquakes, with a probability gain around 1.5 against a Poisson model. These
results show that the ULF seismo-magnetic phenomena at Kakioka clearly contain
precursory information and have a possibility of forecasting of large earthquake. |
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