Abstract
In the history of earthquake thermal infrared research, it is undeniable that before and after strong earthquakes there are significant thermal infrared anomalies which have been interpreted as preseismic precursor in earthquake prediction and forecasting. In this paper, we studied the characteristics of thermal radiation observed before and after the 8 great earthquakes with magnitude up to Ms7.0 by using the satellite infrared remote sensing information. We used new types of data and method to extract the useful anomaly information. Based on the analyses of 8 earthquakes, we got the results as follows. (1) There are significant thermal radiation anomalies before and after earthquakes for all cases. The overall performance of anomalies includes two main stages: expanding first and narrowing later. We easily extracted and identified such seismic anomalies by method of “time-frequency relative power spectrum.” (2) There exist evident and different characteristic periods and magnitudes of thermal abnormal radiation for each case. (3) Thermal radiation anomalies are closely related to the geological structure. (4) Thermal radiation has obvious characteristics in abnormal duration, range, and morphology. In summary, we should be sure that earthquake thermal infrared anomalies as useful earthquake precursor can be used in earthquake prediction and forecasting.
Highlights
We should be sure that earthquake thermal infrared anomalies as useful earthquake precursor can be used in earthquake prediction and forecasting
According to limited infrared remote studies, there is abnormal radiation anomalies before great earthquakes, which is a natural phenomenon that happened during the earthquake process, and it is the basis of our study
As we know, extracting seismic radiation anomaly is very important for the research on seismic thermal radiation, because the anomaly signal is weak and often interfered by the complicated background information
Summary
According to limited infrared remote studies, there is abnormal radiation anomalies before great earthquakes, which is a natural phenomenon that happened during the earthquake process, and it is the basis of our study. Many countries in the world have research on earthquake thermal radiation, including China, which has made great progress in its extraction methods [10,11,12,13,14,15,16,17,18,19,20]. We effectively removed the non-seismic anomaly factors and highlighted thermal radiation of seismic anomalies by using the method of “time-frequency relative power spectrum,”. We applied the satellite infrared remote sensing data (quite black-body radiation, for short TBB) from Chinese Geostationary Meteorological satellite FY-2C/2E to study the changes of thermal radiation observed before and after the eight great earthquakes. We obtained the time-frequency space data in dominant frequency and amplitude after the treatment of wavelet transform and relative power spectrum. We gained the seismic radiation anomalies by scanning the time-frequency data with the method of time-frequency map in whole space-time and full band
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