| 滇西至滇西南地区近期中强地震前单台波速比变化特征研究 |
| |
| 引用本文： | 何应文,杨晓琳,王建芳,杨建文,杞应平.滇西至滇西南地区近期中强地震前单台波速比变化特征研究[J].大地测量与地球动力学,2019,39(8):798-803. |
| |
| 作者姓名： | 何应文 杨晓琳 王建芳 杨建文 杞应平 |
| |
| 作者单位： | 云南省地震局云县地震台,云南省临沧市云县草皮路98号,675803;云南省临沧市地震局,云南省临沧市世纪路350号,677000;临沧市临翔区地震局,云南省临沧市白塔路101号,677000;云南省地震局形变测量中心,昆明市知春路249号,650041;云南省双江县水利局,云南省临沧市双江县北回归大道30号,677300 |
| |
| 基金项目： | 云南省地震局青年地震科学基金;云南省地震局青年地震科学基金;中国地震局三结合课题 |
| |
| 摘 要： | 利用云南区域数字台网波形资料，采用单台多震和达法计算2011年以来滇西至滇西南地区MS≥5.5地震前后的波速比，对震中距160 km范围内各台站波速比时间进程曲线变化特征进行动态跟踪分析。结果显示，5次地震前存在占比分别为56%、33%、16%、15%的低值异常、高值异常、低值-高值-低值、高值-正常的中期异常特征，还存在占比分别为41%、31%、28%的低值-高值回返、高值持续、低值持续3种短临异常特征。震区不同方位的波速比异常对比分析表明，2次盈江地震前，异常明显区域位于震源东南部，洱源地震前异常突出区域位于震源东北部，景谷地震前异常显著区域位于澜沧江断裂西北部的临沧地区。
|
| 关 键 词： | 滇西至滇西南地区 MS≥5.5地震 单台多震和达法 波速比异常 |
Temporary Variation of vP/vS at Single Seismic Station before Recent Moderate and Strong Earthquakes in West to Southwest Yunnan |
| |
| HE Yingwen,YANG Xiaolin,WANG Jianfang,YANG Jianwen,QI Yingping.Temporary Variation of vP/vS at Single Seismic Station before Recent Moderate and Strong Earthquakes in West to Southwest Yunnan[J].Journal of Geodesy and Geodynamics,2019,39(8):798-803. |
| |
| Authors: | HE Yingwen YANG Xiaolin WANG Jianfang YANG Jianwen QI Yingping |
| |
| Abstract: | Using waveform data from Yunnan regional digital station network, we analyze the spatio-temporary variations of wave velocity ratio before and after MS≥ 5.5 earthquakes in western Yunnan and southwest Yunnan since 2011. Using the Wadati method of single station and multi-earthquake, we undertake dynamic tracking analysis on the variation characteristics of wave velocity versus time course curves of various stations within 160 km before the earthquakes, The results show that before the five earthquakes, there were low value anomalies, high value anomalies, low value-high value-low value anomalies, high value-normal medium-term anomalies, accounting for 56%, 33%, 16% and 15% respectively, and low value-high value returns, high value persistence, and low value persistence three short-term and imminent anomalies, accounting for 41%, 31% and 28% respectively. Comparative analysis of wave velocity ratio anomalies in different directions in the earthquake area show that before the two Yingjiang earthquakes, the obvious anomaly area is located in the southeast of the earthquake source, the prominent anomaly area before the Eryuan earthquake is located in the northeast of the earthquake source, and the obvious anomaly area before the Jinggu earthquake is located in Lincang area in the northwest of the Lancang river fault. |
| |
| Keywords: | Yunnan and southwest Yunnan MS≥5 5 earthquake Wadati method of single station and multi-earthquake abnormal wave velocity ratio |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《大地测量与地球动力学》浏览原始摘要信息 |
| 点击此处可从《大地测量与地球动力学》下载免费的PDF全文 |
|
