2008年以来滇西地区地震序列的 谱振幅相关系数变化特征

黄浩; 付虹

doi:10.3969/j.issn.0253-3782.2014.04.009

2008年以来滇西地区地震序列的谱振幅相关系数变化特征

黄浩¹,
付虹^2, ,

1.
中国西宁 810001 青海省地震局
2.
中国昆明 650224 云南省地震局

基金项目: 云南省人民政府“十项重大措施”地震监测预报项目(JCYB-20080601-05)资助.

详细信息

通讯作者:
付虹,e-mail: ynfuhong@tom.com

中图分类号: P315.3⁺1
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出版历程
- 收稿日期: 2013-06-24
- 修回日期: 2013-12-14
- 发布日期: 2014-06-30

Characteristics of the correlation coefficient of spectral amplitude of earthquake sequences in western Yunnan region since 2008

Huang Hao¹,
Fu Hong^2, ,

1.
Earthquake Administration of Qinghai Province, Xining 810001, China
2.
Earthquake Administration of Yunnan Province, Kunming 650224, China

摘要

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M_S≥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M_S≥5.0地震的再次发生.
- 地震序列 /
- 滇西地区 /
- 谱振幅相关系数 /
- 震源机制一致性
Abstract: Using digital seismic waves recorded by Yunnan Digital Seismic Network, we calculated the correlation coefficient of spectral amplitude of six M_S≥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 M_S≥5.0 earthquake in the source region.
- earthquake sequence /
- western Yunnan region /
- correlation coefficient of spectral amplitude /
- consistency of focal mechanism

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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

下载: 全尺寸图片幻灯片

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M_S5.2地震序列； ② 2008-08-20和08-21盈江M_S4.9，M_S5.8地震序列； ③ 2010-04-02和04-03腾冲M_S4.3，M_S4.0地震序列； ④ 2010-06-01施甸M_S4.8地震序列； ⑤ 2011-03-10盈江M_S5.8地震序列； ⑥ 2011-06-20和08-09腾冲M_S5.3，M_S5.2地震

Figure 2. Distributions of earthquake sequences and stations (denoted by solid triangles) in western Yunnan region

① M_S5.2 Yingjiang earthquake sequence of March 21，2008; ② M_S4.9 and M_S5.8 Yingjiang earthquake sequence of August 20，2008 and August 21，2008，respectively; ③ M_S4.3 and M_S4.0 Tengchong earthquake sequence of April 2，2010 and April 3，2010，respectively; ④ M_S4.8 Shidian earthquake sequence of June 1，2010; ⑤ M_S5.8 Yingjiang earthquake sequence of March 10，2011; ⑥ M_S5.3 and M_S5.2 Tengchong earthquake sequence of June 20，2011 and August 9，2011，respectively

下载: 全尺寸图片幻灯片

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M_S5.2地震序列；(b)2008-08-20和08-21盈江M_S4.9，M_S5.8地震序列； (c)2010-04-02和04-03腾冲M_S4.3，M_S4.0地震序列;(d)2010-06-01施甸M_S4.8地震序列； (e)2011-03-10盈江M_S5.8地震序列；(f)2011-06-20和08-09腾冲M_S5.3，M_S5.2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)M_S5.2 Yingjiang earthquake sequence of March 21，2008;(b)M_S4.9 and M_S5.8 Yingjiang earthquake sequence of August 20，2008 and August 21，2008，respectively;(c)M_S4.3 and M_S4.0 Tengchong earthquake sequence of April 2，2010 and April 3，2010，respectively;(d)M_S4.8 Shidian earthquake sequence of June 1，2010; (e)M_S5.8 Yingjiang earthquake sequence of March 10，2011;(f)M_S5.3 and M_S5.2 Tengchong earthquake sequence of June 20，2011 and August 9，2011，respectively

下载: 全尺寸图片幻灯片

表 1 2008年以来滇西地区部分M_S≥4.0地震的基本参数

Table 1 Basic parameters of partial M_S≥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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