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| Titel |
Ambient seismic noise monitoring in Chuetsu, Japan and the area affected by wave speed variations |
| VerfasserIn |
Céline Hadziioannou, Eric Larose, Yosuke Aoki, Tetsuya Takeda, Michel Campillo |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050930
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| Zusammenfassung |
| Ambient noise crosscorrelations have been used on several occasions to monitor temporal
variations in seismic velocity. The 24 stations used in this study are a sub-array of the Hi-Net
network that covers most of Japan. Approximately 2 years of continuous two-component
measurements are available for the tiltmeters of these stations, spanning from the start of
2004 to the end of 2005. On October 23, 2004, a Mw = 6.6 event occurred in the Niigata
prefecture, in the area of Chuetsu. Using ambient noise crosscorrelation monitoring between
0.1-1.0 Hz, we observe a seismic wave speed drop of approximately 0.15 % coinciding with
this event.
In addition, we use the spatial extent of the array to study how far the effect of the wave speed
drop is detected. |
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