利用Sato模型对宁夏及邻区尾波Q值的研究

EARTHQUAKE ›› 2011, Vol. 31 ›› Issue (1): 118-126.

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Q Values of Seismic Coda in Ningxia and Adjacent Regions based on Sato Model

SHI Hai-kuo¹, ZHU Xin-yun^2,3, HE Yong-zhong¹, ZHANG Li-heng¹

1. Earthquake Administration of Ningxia Hui Autonomous Region, Zhongwei 755000, China;
2. Institute of Geophysics, CEA, Beijing 100081, China;
3. Earthquake Administration of Zhejiang Province, Hangzhou 310013, China

Received:2010-04-29 Revised:2010-08-17 Online:2011-01-31 Published:2021-09-08

Abstract

Abstract: Based on the Sato model, adopting digital wave datas of 121 earthquake above M_L2.0 from January 2008 to December 2009, which were recorded by Ningxia earthquake nets, the average Q value of seismic coda in relative regions is calculated, and the relationship between Q value and frequency is polyfited. The whole region′s result is Q(f)=(44.81±15.87)·f^{0.9491±0.0805} . Compared with other regions, the Q value of seismic coda in Ningxia and adjacent regions is relatively lower, but the dependence on frequency is higher. According to the regional seismic tectonic characteristics and the homochronous seismic activity, we divided the research region into four concentrated minor-earthquake areas: (a) Ji Lantai, (b) Yin Chuan, (c) Wei Ningtong, (d) Gu Hai, and the calculated Q values of the four regions relatively are: (a) Q(f)=(53.59±17.08)f^{0.9148±0.0692}, (b) Q(f)=(53.04±16.29)f^{0.921±0.0777}, (c) Q(f)=(42.25±15.03)f^{0.9532±0.0787}, (d) Q(f)=(41.65±13.46)f^{0.9636±0.0774}. Comparison of the polyfited results shows that Q value′s distribution reflects the related region′s tectonic activities and seismic activity.

Key words: Q value, Sato model, Ningxia and Adjacent regions, Small earthquake concentration area

CLC Number:

P315.7

SHI Hai-kuo, ZHU Xin-yun, HE Yong-zhong, ZHANG Li-heng. Q Values of Seismic Coda in Ningxia and Adjacent Regions based on Sato Model[J]. EARTHQUAKE, 2011, 31(1): 118-126.

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Q Values of Seismic Coda in Ningxia and Adjacent Regions based on Sato Model

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