兰州市红古区非天然地震记录特征分析

Characteristics of Non-natural Earthquake Records in Honggu District, Lanzhou

摘要:

选取2010年1月至2020年8月期间甘肃区域测震台网记录的兰州市周边地区三分向宽频带数字波形资料，采用震中位置空间分布、波形特征及傅里叶频谱特征对比等多种方法相结合，分析兰州市红古区非天然地震活动的特性。结果显示：该区临近测震台记录的大量地震事件波形特征和傅里叶频谱特征与其他区域地震存在显著差异，符合非天然地震的典型震相特征，且空间分布密集、震级较大，初步分析与该区矿产资源开发活动密切相关。对红古区非天然地震特征的研究有助于台网工作人员快速、准确的判别兰州周边地震类型，同时对兰州市地震灾害风险评估与防治也具有积极的参考价值。

Abstract:

In this paper, based on the three-component broadband digital waveform data recorded by Gansu seismic network from January 2010 to August 2020, the characteristics of non-natural seismicity in Honggu District of Lanzhou City were analyzed by adopting the spatial distribution of epicenter location, waveform characteristics, and Fourier spectrum characteristics. The results showed the waveform characteristics and Fourier spectrum characteristics of a large number of seismic events in Honggu District are significantly different from those in other areas. Through preliminary analysis, it was found that the typical seismic phase characteristics of non-natural earthquakes in Honggu District are closely related to the exploitation of mineral resources in the area. The study on the characteristics of non-natural earthquakes in Honggu District can be helpful to quickly and accurately identify the earthquake types around Lanzhou, and also has positive scientific significance for the risk assessment and prevention of earthquake disasters in Lanzhou area.