![]() ![]() Predicting earthquakes convincingly from such anomalies is far from easy. ![]() Geophysical Anomalies and Earthquake Predictionįinding anomalies is easy. In summary, we should be sure that earthquake thermal infrared anomalies as useful earthquake precursor can be used in earthquake prediction and forecasting. (4) Thermal radiation has obvious characteristics in abnormal duration, range, and morphology. (3) Thermal radiation anomalies are closely related to the geological structure. 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. The overall performance of anomalies includes two main stages: expanding first and narrowing later. (1) There are significant thermal radiation anomalies before and after earthquakes for all cases. Based on the analyses of 8 earthquakes, we got the results as follows. ![]() We used new types of data and method to extract the useful anomaly information. 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. 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. Wei, Congxin Zhang, Yuansheng Guo, Xiao Hui, Shaoxing Qin, Manzhong Zhang, Ying Thermal infrared anomalies of several strong earthquakes. 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. Thermal Infrared Anomalies of Several Strong Earthquakes That is, these anomalies could occur under the effects of tectonic activity, but they do not necessarily relate to the occurrence of earthquakes. In most cases, the vast majority of the anomalies, including microscopic and macroscopic anomalies, are caused by tectonic activity. This case tells us that there is no direct relationship between an earthquake and these anomalies. In addition, groundwater data may be used as a good indicator of tectonic activity. Combined with microscopic groundwater, geodetic and seismic activity data, we infer that the anomalies in the Xichang area were the result of increasing tectonic activity in the Sichuan-Yunnan block. Furthermore, the groundwater level was elevated in the northwest part of the Zemuhe fault and depressed in the southeast part of the Zemuhe fault zone, with a border somewhere between Puge and Ningnan Counties. Spatially, the groundwater and animal anomalies were distributed along the Anninghe-Zemuhe fault zone. During our field survey in 2002, we found that the timing of the high-frequency occurrence of groundwater anomalies was in good agreement with those of animal anomalies. In this study, we documented a case involving large-scale macroscopic anomalies in the Xichang area, southwestern Sichuan Province, China, from May to June of 2002, after which no major earthquake occurred. Shi, Zheming Wang, Guangcai Liu, Chenglong Che, Yongtai Tectonically Induced Anomalies Without Large Earthquake Occurrences ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |