Abstract
Electromagnetic precursors before the Wenchuan earthquake on May 12, 2008 were collected and summarized on the basis of related published papers. The relationship between electromagnetic anomalies and different earthquake preparation stages was analyzed, and an entire seismic preparation process was constructed according to corresponding anomalies in different electromagnetic parameters. It is illustrated that stereo electromagnetic observation is useful in the understanding of earthquake preparation mechanism. It is inevitable that a lot of problems exist in anomaly distinguishing and coupling mechanism analysis, which needs further studies in future.
Highlights
The ground-based electromagnetic precursor observation has been developed in China for more than 40 years, which includes the observation of resistivity, electric field, geomagnetic field, electromagnetic emissions, and so on
In a sum of all electromagnetic precursors before the Wenchuan earthquake (Figure 3), the preparation process of this earthquake can be divided into four stages
Based on the observation of earth resistivity, it can be concluded that the process of stress accumulation before the Wenchuan Ms8.0 earthquake took more than 2 years (Figures 3; and 1) since 2006
Summary
The ground-based electromagnetic precursor observation has been developed in China for more than 40 years, which includes the observation of resistivity, electric field, geomagnetic field, electromagnetic emissions, and so on. Many papers have been published about this destructive event, in which many anomalies were found in ground-based information and in space ionospheric detection (e.g., [1,2,3,4]). All these electromagnetic phenomena illustrated their relationship with this strong earthquake. It is regretful that most anomalies were obtained and published after the earthquake, so they did not play a great part in earthquake prediction. The main purpose of this paper is to summarize the electromagnetic anomalies and think about what we can learn from them
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