Microwave radiation anomaly of Wenchuan earthquake and its mechanism.ppt
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The document presents a study on microwave radiation anomalies before the 2008 Wenchuan earthquake in China. A new method is proposed to extract microwave radiation anomalies from satellite data by eliminating effects of terrain and weather. Analysis found positive microwave anomalies from 40 days to 2 days before the earthquake near the epicenter. Experimental work on rock samples under loading showed that microwave radiation increases in the fracturing stage, providing a potential explanation for the observed pre-earthquake microwave anomalies.
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Microwave radiation anomaly of Wenchuan earthquake and its mechanism.ppt
- 1. Microwave Radiation Anomaly of Wenchuan Earthquake and Its Mechanism Shanjun Liu Yuntao Ma Institute for GIS/RS/GPS & Digital Mine Research Northeastern University, China IGARSS’11 Vancouver 2011.7.27
- 3. Since 2000 there are many violent earthquakes happened in the world, such as Sumatra earthquake, Wenchuan earthquake, Haiti earthquake and Japan earthquake. These earthquakes cause many people death and injured. 1. BACKGROUND-Earthquake and thermal anomaly
- 5. Thermal infrared anomaly before Wenchuan earthquake India Plate Tibetan Plateau Loess Plateau
- 9. The second step is to eliminate the influencing of weather condition. Suppose the whole investigated area is in the same weather conditions, i.e. the brightness temperature variations of all pixels are in same step. we select the mean value of four pixels located at the four corners of the investigated area as the background value. The following formulas are introduced. 2)The second step is the background value. is the final result after eliminating the influencing of weather
- 10. Through above two steps the influencing of geographical and weather are eliminated. So we can analyze the microwave radiation anomaly before Wenchuan earthquake. Data AMSR-E data was selected to analyze the microwave anomaly Frequency : 18.7GHz Polarization type : vertical Time range : from Appr.1 to May 30 of each year between 2003 and 2008.
- 11. RESULTS Apr. 5 Apr. 10 Sichuan Basin Longmenshan Fault Epicenter Apr. 14 Apr. 20 May 6 May 11
- 12. May 12 May 16 May 18 May 20 May 22 May 27
- 13. the epicenters of aftershocks were coincident with the anomaly area in spatial position aftershocks Microwave anomaly
- 14. Anomlay Features 1) From 40 days to 2 days before Wenchuan earthquake some positive microwave anomalies appeared on the surrounding area of epicenter. The largest increment of microwave brightness temperature in the investigated area was up to 12K; 2) 1 day before earthquake (May 11, 2008) the anomaly moved gradually to the epicenter of the earthquake. 3) After the earthquake the anomaly distributed along the Longmenshan Fault, and the epicenters of aftershocks were coincident with the anomaly area in spatial position.
- 15. 3.1 Experimental Design Infrared thermal imager Infrared spectroradiometer 3 Experimental Study on the Anomaly Mechanism microwave radiometer Acoustic emission(AE) monitoring instrument
- 16. Rock sample and the detectors AE detector Microwave antenna Strain gauge load head
- 20. Thanks！ IGARSS’11 Vancouver 2011.7.27
- 23. Stage I to Stage II Stage III Stage IV Temperature increase due to thermoelastic effect AIRT and microwave emission increase, AIRT and microwave emission are coincident in step dielectric constant increase due to vacuum volume increase microwave emission decrease Temperature increase due to friction-heat effect AIRT and microwave emission increase again Shrink Volume increase Fracture Discussion on the Mechanism