摘要
本文分析了河北怀来多次爆炸、河北三河采石场多次爆炸和低震级天然地震事件的记录特征和时频差异。结果显示:河北怀来爆炸的P波能量强、衰减快、S波发育弱;河北三河采石场爆炸的P波、S波主频均低于怀来爆炸,S波与面波混淆,不同震中距的台站记录低频发育明显;而天然地震的有效频带更宽,频率成分更为复杂。将Pg/Sg谱比判据应用于小震级地震与爆炸的识别中,探索交叉频带谱比对不同地区爆炸的识别。结果表明:高频(>5 Hz)Pg/Sg谱比判据可将研究数据中的爆炸与小震级地震完全区分;与Sg低频(0—2 Hz)有关的交叉频带谱比可对两个不同地区的爆炸进行识别,交叉频带的谱比判据较传统的单一频带谱比判据能够更好地反映出不同类型事件的特征差异。
The differences of the seismic characteristics and frequency of the Huailai explosions,the Sanhe quarry explosions and the natural earthquakes with low magnitude are discussed.The results show that the two different area explosions have obviously different seismic characteristics and frequency distribution,Huailai explosion has stronger P wave energy than S wave and fast attenuation;The main frequencies of P wave and S wave in Sanhe quarry explosion are lower than that in Huailai explosion,S wave and surface wave are confused,and the low frequency developed obviously at different distances;While for natural earthquakes,the effective frequency band is wider and the frequency components are more complex than explosions.Pg/Sg spectral ratios in small-magnitude earthquakes and explosions were studied and crossband spectral ratios were explored.Results obtained show that the high frequency(>5 Hz)Pg/Sg spectral ratio discriminants can completely distinguish explosions from low magnitude earthquakes;The spectral ratios of the cross-band related to low frequency(0-2 Hz)of Sg can effectively identify explosions in these two areas,Pg/Sg discriminants of the crossed frequency band can better reflect the difference characteristics of different types of events than that of the traditional single frequency band.
作者
王婷婷
边银菊
杨千里
任梦依
Wang Tingting;Bian Yinju;Yang Qianli;Ren Mengyi(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
出处
《地震学报》
CSCD
北大核心
2021年第4期427-440,共14页
Acta Seismologica Sinica
基金
中央级公益性科研院所基本科研专项(DQJB19B17)
核查项目共同资助。
关键词
大当量爆炸
采石场爆炸
多窗口谱分析
Pg/Sg谱比
地震事件分类
large yield explosion
quarry explosion
multi-window spectral analysis
Pg/Sg spectral ratio
event classification
