|
|||||
|
|
| 辽宁1999年Ms5.9岫岩地震的剪切波分裂特征 | |
| 引用本文： | 太龄雪,高原,曹凤娟,石玉涛,吴晶,焦明若.辽宁1999年Ms5.9岫岩地震的剪切波分裂特征[J].地震学报,2008(4). |
| 作者姓名： | 太龄雪 高原 曹凤娟 石玉涛 吴晶 焦明若 |
| 作者单位： | 1. 中国,北京,100036,中国地震局地震预测研究所 2. 中国,沈阳110031,辽宁省地震局 3. 中国,北京,100036,中国地震局地震预测研究所;中国,南京,210014,江苏省地震局 |
| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项 |
| 摘 要： | 利用辽宁遥测数字地震台网营口台的地震波形资料,采用高原等剪切波分裂SAM分析方法,对1999年11月29日辽宁省岫岩Ms5.9(ML5.3)地震前后的地震序列进行了剪切波分裂分析.通过对营口台的资料分析表明,快剪切波优势偏振方向为ENE-WSW向,与该地区主压应力方向一致,也与华北区域构造应力场方向一致;平均慢剪切波时间延迟在岫岩地震前显示增加,可能反映了震前的应力积累过程.营口台的快剪切波优势偏振方向还与小地震活动空间分布走向一致,与活动断层走向相关.快剪切波偏振的月平均变化直方图也显示,地震前两个月快剪切波偏振方向似乎也有变化,但这个现象还需要更多资料的证实. |
| 关 键 词： | 岫岩地震 剪切波分裂 偏振方向 时间延迟 |
Shear-wave splitting before and after the 1999 Xiuyan earthquake in Liaoning,China |
|
| Tai Lingxue,Gao Yuan,Cao Fengjuan,Shi Yutao,Wu Jing,Jiao Mingruo.Shear-wave splitting before and after the 1999 Xiuyan earthquake in Liaoning,China[J].Acta Seismologica Sinica,2008(4). | |
| Authors: | Tai Lingxue Gao Yuan Cao Fengjuan Shi Yutao Wu Jing Jiao Mingruo |
| Abstract: | Using seismic waveform data recorded at station Yingkou (YK) of Liaoning Telemetry Digital Seismic Network, this paper studied the characteristics of shear-wave splitting before and after the Xiuyan MS5.9 (ML5.3) earthquake on November 29, 1999, with the SAM method (Gao et al). The result shows that predominant polarization of fast shear-waves at YK is in direction of ENE--WSW, consistent with the direction of regional principal compressive stress and also consistent with the direction of regional tectonic stress field in North China. The time-delays increased before the Xiuyan earthquake, indicating stress accumulation before the mainshock. Predominant polarization of fast shear-waves at YK is also related to the spatial distribution of small earthquakes and correlated to the fault strike. The histogram of monthly average polarizations of fast shear-waves shows that the polarization of fast shear-waves seems to have changed from two months before the mainshock, but this needs to be verified with more data. |
| Keywords: | Xiuyan earthquake shear-wave splitting polarization time delay |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
