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2017年3月27日漾濞5.1级地震前后气枪震源观测走时数据的变化
杨建文1, 何应文2, 张鹏映3, 叶泵1, 邓嘉美1, 赵家本1
1.中国地震局滇西地震预报实验场办公室, 云南大理 671000;2.云南省地震局云县地震台, 云南临沧 675803;3.大理海东开发市政建设有限公司, 云南大理 671006
摘要:
以2017年3月27日漾濞5.1级地震为例,根据区域特性和信噪比要求,选取数据较为完整的6个台站记录的2017年1月1日~6月6日期间的宾川地震信号发射台气枪震源波形资料,采用互相关检测技术提取6个台站各自稳定震相的走时数据,并对漾濞5.1级地震前后走时数据的变化情况进行分析。结果表明,漾濞5.1级地震前后6个台站各自稳定震相存在较为明显的走时变化,且短期内走时变化具有较好的同步性,相关台站异常幅度大小和异常出现时间存在细小差异。地震发生前,6个台站走时低值异常过程明显,以YUL台最为显著。地震发生前后走时变化形态特征为双“V”型,漾濞5.1级地震发生在第1个“V”型末端。地震发生后,不同方位相关台站受地震的影响程度不同,走时波动大小存在差异。
关键词:  漾濞5.1级地震  气枪震源  走时变化
DOI:
分类号:P315
基金项目:云南省青年地震科学基金(2018k08)、云南省陈颙院士工作站(2014IC007)、国家自然科学基金(41574059、41474048)和云南省地震局科技专项基金(ZX2015-01、2018ZX04)共同资助
Travel-time Variations before and after the Yangbi MS5.1 Earthquake on March 27,2017 from the Airgun Source Seismic Data
Yang Jianwen1, He Yingwen2, Zhang Pengying3, Ye Beng1, Deng Jiamei1, Zhao Jiaben1
1.Office of the Western Yunnan Earthquake Prediction Study Area, China Earthquake Administration, Dali 671000, Yunnan, China;2.Yunxian Seismic Station of Yunnan Earthquake Agency, Lincang 675803, Yunnan, China;3.Dali Haidong Development Municipal Construction Co., Ltd., Dali 671006, Yunnan, China
Abstract:
Taking the Yangbi MS5.1 earthquake on March 27,2017 as an example,according to the regional characteristics and signal-to-noise ratio requirements,the data from 1 January to 6 June, 2017 recorded by 6 stations with relatively complete recording were selected. The source waveform data of the airguns of the Binchuan earthquake signal launching platform were used to extract the travel time data of the stable seismic phases of the six stations,and to analyze the changes of the travel-time data before and after the Yangbi MS5.1 earthquake. The results show that there are obvious time-varying changes in the stable seismic facies of the 6 stations before and after the Yangbi MS5.1 earthquake,and the short-term transit time has good synchronization. There are small differences between the abnormal amplitude of the relevant stations and the abnormal time. The low-value anomaly process of the 6 stations before the earthquake was obvious,and the YUL station was the most significant. The morphological characteristics of the travel time before and after the earthquake are "double V",and the Yangbi MS5.1 earthquake occurs at the end of the first "V" shape. After the earthquake,different stations with different orientations are affected by the earthquake,and there are differences in the fluctuations of travel time.
Key words:  The Yangbi MS5.1 earthquake  Airgun source  Travel-time change