Quantitative Drawing of Seismic Calm Images Before the Main Earthquake in Wenchuan Earthquake Sequence
DOI:
https://doi.org/10.54097/47ephv34Keywords:
Change of seismic activity rate, Earthquake calm, Stress triggering, Self-triggeringAbstract
Using zmap grid technology, the temporal and spatial changes of Wenchuan earthquake, Lushan earthquake and Jiuzhaigou earthquake aftershock area and extended aftershock area were calculated. It was found that Lushan earthquake was calm before and after the earthquake, but the degree of calm was low. Jiuzhaigou is located in the Coulomb stress shadow area, and there was remarkable earthquake calm before the earthquake, which may be related to the self-excitation of small earthquakes in the extended aftershock area outside the aftershock area. In addition, the Lushan earthquake also played a certain unlocking role in Jiuzhaigou, because the change of seismic activity rate in the extended aftershock area of Jiuzhaigou after the Lushan earthquake showed a calm increase but a regional decrease.
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