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王鹏, 王宝善
关键词:  ETAS模型  长岛震群  模板匹配  完备震级  b值  流体触发
Seismic Activity Characteristics of Chang Island Earthquake Swarm in Shandong Province Based on ETAS Model
WANG Peng, WANG Baoshan
Institute of Geophysics, China Earthquake Administration
Influenced by the layout of seismic network and the location of earthquakes, a large number of earthquakes are often omitted in earthquake sequence, and the integrity of earthquake catalogue directly affects the reliability of the analysis of sequence activity characteristics. In this paper, the GPU accelerated template matching method is used to scan the continuous waveforms of Chang Island earthquake swarm in Shandong Province from February 9 to August 20, 2017.We have detected 15286 earthquake events, which is more than 6 times the catalogue of the network, and the complete magnitude has been reduced from 1.0 to 0.5. Based on the complete catalogue of earthquakes, the activity characteristics of Chang Island earthquake swarm are analyzed by using the contagious aftershock sequence (ETAS) model. The random components in the ETAS model can be used as an index for triggering earthquakes by external forces (fluids). The results show that the proportion of earthquakes triggered by external forces of Chang Island swarm increases gradually (from 31.9% to 63.5%) and then decreases. The latter period of swarm development is mainly affected by the self-excitation of earthquakes. It is preliminarily inferred that fluids play a role in the development of the Chang Island swarm, but the triggering intensity of fluids to microseismicity is different in different periods, which may be related to the process of fluid permeation.
Key words:  ETAS model  Chang Island Earthquake Swarm  Matched filter technique  Magnitude of completeness  b value  Fluid triggered