| Technology and Methodology |
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Variation characteristics in infrared radiation of active fault zone related to earthquakes |
| JING Feng1, SHEN Xuhui1, ZHANG Tiebao2, XIONG Pan1, SUN Ke1 |
1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
2. Earthquake Administration of Sichuan Province, Chengdu 610041, China |
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Abstract The brightness temperature variation along the Ganzi-Yushu fault before and after 2010 Ms 7.1 Yushu earthquake was analyzed using MODIS data so as to obtain the infrared radiation variation information of the active fault related to the earthquake. It is shown that the value of the brightness temperature in one month before the earthquake was higher than that of other periods. The maximum variation was located at the northern end of the fault, where surface ruptures were found by field investigation. The obvious increase of brightness temperature was found during the 7-16 days after this event through an analysis of the data obtained from the seismic month at 10 day interval, and this might have had some relationship with the degassing of vapor and CO along the faults during the earthquake. For comparison, the data obtained in the same period of 2011 were analyzed. The results indicate that the brightness temperature of Ganzi-Yushu fault showed a homogeneous belt during the non-seismic time. The increase in brightness temperature of this fault was also found in May which might have had relationship with the Ms 5.3 Nangqian earthquake that occurred on June 26, 2011. It can be concluded that the variation of brightness temperature related to the fault zone can serve as an indicator of the fault activities. The study of the infrared radiation variation of main faults using satellite data is therefore significant for the monitoring of the seismic tectonic activity.
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| Keywords
remote sensing(RS)
multi-purpose regional geochemical survey(MPRGS)
geochemical evaluation
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Issue Date: 21 February 2013
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2013,
Vol. 25
