﻿ 汶川M<sub>S</sub>8.0地震前的地面运动排列熵变化
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 大地测量与地球动力学  2019, Vol. 39 Issue (6): 573-576  DOI: 10.14075/j.jgg.2019.06.005

### 引用本文

XU Kangsheng, LI Ying. The Permutation Entropy Change of Ground Motion before the MS8.0 Wenchuan Earthquake[J]. Journal of Geodesy and Geodynamics, 2019, 39(6): 573-576.

### Corresponding author

LI Ying, senior engineer, majors in earthquake emergency, E-mail: 657148282@qq.com.

### 第一作者简介

XU Kangsheng, senior engineer, majors in seismology and seismic data processing, E-mail: xuks@foxmail.com.

### 文章历史

1. 中国地震局兰州地震研究所，兰州市东岗西路450号，730000

1 资料和方法

 ${H_{(p)}}(m) = - \sum\limits_{j = 1}^k {{P_j}} \;{\rm{ln}}{P_j}$

H即为排列熵，熵值越大，复杂度越高；熵值越小，复杂度越低。

2 地面运动速度的排列熵变化

 图 1 震中和采用的地震台站分布 Fig. 1 The epicenter and distribution of the used seismic stations

 图 2 22个地震台的垂直向地面运动排列熵分布 Fig. 2 The permutation entropy distribution of vertical components at 22 seismic stations

3 结果与讨论

4 结语

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The Permutation Entropy Change of Ground Motion before the MS8.0 Wenchuan Earthquake
XU Kangsheng1     LI Ying1
1. Lanzhou Institute of Seismology, CEA, 450 West-Donggang Road, Lanzhou 730000, China
Abstract: In this paper, we introduce the theory of entropy using seismology. We use seismic data of 22 seismic stations in Sichuan seismic network. The permutation entropy is calculated in vertical components per hour, respectively. We study the temporal and spatial variation characteristics of the permutation entropy of ground motion before the MS8.0 Wenchuan earthquake and try to extract information about this earthquake. The results show that within 22 h before the Wenchuan earthquake, a high entropy area is formed near the epicenter. This high value area and the high value area on the north side of the Longmenshan fault system show a trend of wax and wane. The low value area on the east side of the epicenter stretches in the north-south direction, and bifurcates in the north-west direction of the epicenter. The Wenchuan earthquake occurs in the steep zone between the new high value zone and the low value zone. Combined with the findings of other scholars, we believe that these phenomena are likely to be related to the occurrence of the Wenchuan earthquake. Based on the temporal and spatial variation characteristics of the permutation entropy, we speculate that the earthquake is not only the result of the confrontation between the Bayan Har block and the Sichuan basin, but the movement of the Ordos block on the north side of the Longmenshan mountain fault system also participates in the seismogenic occurrence of the earthquake.
Key words: Wenchuan earhquake; ground motion; seismic data; permutation entropy; seismogenic