Characteristics of the correlation coefficient of spectral amplitude of earthquake sequences in western Yunnan region since 2008
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摘要: 使用云南数字地震台网记录的波形数据， 计算了滇西地区2008—2011年发生的6个MS≥4.0地震序列的谱振幅相关系数. 结果表明， 这些地震序列无论是前震型、 主震-余震型， 还是震群型地震， 其谱振幅相关系数均较高， 分析认为可能是该区域处于高应力水平状态所造成的. 谱振幅相关系数较小的地震序列， 其震源机制一致性不高， 区域应力场强度较低， 可以作为判别后续没有更大地震的指标. 前震序列的谱振幅相关系数较高， 但谱振幅相关系数较高的不一定是前震序列. 地震序列的谱振幅相关系数较高， 仅仅表明其区域应力水平较高， 这种状态有利于该区域MS≥5.0地震的再次发生.Abstract: Using digital seismic waves recorded by Yunnan Digital Seismic Network, we calculated the correlation coefficient of spectral amplitude of six MS≥4.0 earthquake sequences occurred from 2008 to 2011 in western Yunnan region. The results suggest that the correlation coefficient of spectral amplitude of earthquake sequences are generally high value, no matter the sequence is foreshock, main shock-aftershock or earthquake swarm, which may be caused by high stress filed in the source region. A smaller correlation coefficient of spectral amplitude, which means less consistency of focal mechanisms and low level of stress filed, can be used as an index to predict that larger earthquakes will not follow behind. The correlation coefficient of spectral amplitude of foreshock sequence is larger; however, a larger correlation coefficient does not indicate the earthquake sequence is foreshock. A larger correlation coefficient of spectral amplitude only implies high level of the stress field, but it is beneficial to occurring MS≥5.0 earthquake in the source region.
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图 1 畹町台(WaD)记录到的一次地震的波形(a)及计算得到的相应观测位移谱(b)
Z， T和R分别表示垂向、 切向和径向分量； PZ和PR分别表示P波位移谱的垂向和 径向分量； SZ， SR和ST分别表示S波位移谱的垂向、 径向和切向分量
Figure 1. Waveform of one earthquake recorded by the station WaD (a), and corresponding displacement spectra from observed data (b)
Z， T and R represent vertical, tangential and radial components, respectively. PZ and PR represent vertical and radial components of the P-wave displacement spectrum, respectively. SZ, SR and ST represent vertical， radial and tangential components of the S-wave displacement spectrum, respectively
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图 2 滇西地区地震序列和台站(三角形表示)分布
① 2008-03-21盈江MS5.2地震序列； ② 2008-08-20和08-21盈江MS4.9，MS5.8地震序列； ③ 2010-04-02和04-03腾冲MS4.3，MS4.0地震序列； ④ 2010-06-01施甸MS4.8地震序列； ⑤ 2011-03-10盈江MS5.8地震序列； ⑥ 2011-06-20和08-09腾冲MS5.3，MS5.2地震
Figure 2. Distributions of earthquake sequences and stations (denoted by solid triangles) in western Yunnan region
① MS5.2 Yingjiang earthquake sequence of March 21，2008; ② MS4.9 and MS5.8 Yingjiang earthquake sequence of August 20，2008 and August 21，2008，respectively; ③ MS4.3 and MS4.0 Tengchong earthquake sequence of April 2，2010 and April 3，2010，respectively; ④ MS4.8 Shidian earthquake sequence of June 1，2010; ⑤ MS5.8 Yingjiang earthquake sequence of March 10，2011; ⑥ MS5.3 and MS5.2 Tengchong earthquake sequence of June 20，2011 and August 9，2011，respectively
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图 3 滇西地区6个地震序列的震级-时间及相关系数图
(a)2008-03-21盈江MS5.2地震序列；(b)2008-08-20和08-21盈江MS4.9，MS5.8地震序列； (c)2010-04-02和04-03腾冲MS4.3，MS4.0地震序列;(d)2010-06-01施甸MS4.8地震序列； (e)2011-03-10盈江MS5.8地震序列；(f)2011-06-20和08-09腾冲MS5.3，MS5.2地震序列
Figure 3. M -t plots and the correlation coefficient of spectral amplitude of six earthquake sequences in western Yunnan region
(a)MS5.2 Yingjiang earthquake sequence of March 21，2008;(b)MS4.9 and MS5.8 Yingjiang earthquake sequence of August 20，2008 and August 21，2008，respectively;(c)MS4.3 and MS4.0 Tengchong earthquake sequence of April 2，2010 and April 3，2010，respectively;(d)MS4.8 Shidian earthquake sequence of June 1，2010; (e)MS5.8 Yingjiang earthquake sequence of March 10，2011;(f)MS5.3 and MS5.2 Tengchong earthquake sequence of June 20，2011 and August 9，2011，respectively
表 1 2008年以来滇西地区部分MS≥4.0地震的基本参数
Table 1 Basic parameters of partial MS≥4.0 earthquakes in western Yunnan region since 2008
下载: 导出CSV
表 2 地震序列的谱振幅相关系数及类型统计
Table 2 Statistics on the correlation coefficient of spectral amplitude and types of earthquake sequences
下载: 导出CSV
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