Study on the Coda Qc-value for aftershock sequence of Yao’an Ms.60 earthquake in Yunnan
详细信息
- 责任者：Li Qiong (Earthquake Administration of Yunnan province ; Kunming 650224 ; China) ; Qin Jiazheng
- 刊名：Journal of Seismological Research
- 出版年：2011
- 卷期：34(3)
- 关键词：强震 ; strong earthquakes ; 地震序列 ; seismic sequence ; 云南 ; Yunnan Province
- 页码：p.300-307
- 图表：7 illus., 2 tables, 21 refs.
- 分类号：0500
- 出版序号：90
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
The coda-wave attenuation factor Qc at the source region of Yao’an,Yunnan,Ms6.0 earthquake in 2009 is estimated through single-scattering theory of coda wave on the basis of the digital waveform data of aftershock sequence recorded by Da’yao Station.When central frequency f=1.5 Hz,the coda attenuation ratio β(f) in Yao’an region ranges from-0.141 27 to-0.043 05,and the average is-0.074 60.The Qc-value of coda ranges from 33.3 to 99.8,and the average is 65.5.The relation between the Qc-value and frequency f is Qc(f)=45.3 f0.97.The coda factor is in direct proportion to magnitude,and in inverse proportion to frequency.In the first few days after the main shock,the Qc-value(1.5 Hz) of coda fluctuated obviously,it showed a tendency toward stabilization within the line of ±1.5 times of variance,and the strong aftershocks smaller than M5 will occur.The Yao’an region has the characteristics of active tectonic-movement,frequent seismic-activity,and low Qc-value.