2021年玛多MS7.4地震与2010年玉树MS7.1地震前频谱特征分析

doi:10.12196/j.issn.1000-3274.2023.03.011

地震 ›› 2023, Vol. 43 ›› Issue (3): 150-158.doi: 10.12196/j.issn.1000-3274.2023.03.011

2021年玛多M_S7.4地震与2010年玉树M_S7.1地震前频谱特征分析

余娜^1,2, 孙玺皓², 张晓清²

1.青海格尔木青藏高原内部地球动力学野外科学观测研究站, 青海西宁 810000;
2.青海省地震局青海西宁 810000

收稿日期:2022-06-27 修回日期:2023-03-20 出版日期:2023-07-31 发布日期:2023-08-28
作者简介:余娜(1984-), 女, 青海民和县人, 工程师, 主要从事数字地震资料的应用研究。
基金资助:
青海格尔木青藏高原内部地球动力学野外科学观测研究站专项; 青海省应用基础研究项目(2023-ZJ-770); 青海省科技成果转化专项(2021-SF-151)

Spectral Characteristics before 2021 Maduo M_S7.4 Earthquake and 2010 Yushu M_S7.1 Earthquake

YU Na^1,2, SUN Xi-hao², ZHANG Xiao-qing²

1. Geodynamics Field Observation and Research Station of the Qinghai-Tibet Plateau, Xining 810000, China;
2. Earthquake Administration of Qinghai Province, Xining 810000, China

Received:2022-06-27 Revised:2023-03-20 Online:2023-07-31 Published:2023-08-28

摘要/Abstract

摘要： 为进一步验证和完善使用频带变窄且向低频段偏移特征识别前震的判定依据, 本文基于青海、甘肃等区域数字化测震台网记录的波形数据, 对比分析2021年玛多7.4级地震前148 d发生的2020年12月24日青海玛多4.2级地震与2010年4月14日玉树7.1级地震前的4.7 级地震快速傅里叶变换的频谱特征。结果显示, 玛多4.2级地震频谱的频段较宽, 优势频段为0~5.0 Hz, 玉树4.7级地震频谱的频带变窄且向低频端偏移的特征较为显著, 优势频段为0~1.5 Hz。对比分析认为, “频带变窄且向低频偏移”现象对识别直接前震有较好的效果, 需重点关注中小地震出现频谱偏移后短期内(1~3个月)震源区附近强震发生的可能性。

关键词: 直接前震, FFT均方谱, 2010年玉树4.7级地震, 2020年玛多4.2级地震

Abstract: In order to further test and improve the judgment basis for identifying foreshocks through the characteristics of “narrow frequency band and low-frequency migration”, this paper compares and analyzes the FFT spectra of the Maduo M_S4.2 earthquake in Qinghai on December 24, 2020, and the Yushu M_S4.7 earthquake in Yushu on April 14, 2010. based on the waveform data recorded by digital seismic networks in Qinghai, Gansu, and other regions. The results show that the frequency band of Maduo M_S4.2 earthquake spectrum is wide, the dominant frequency band is 0~5.0 Hz. The frequency band of the Yushu M_S4.7 earthquake narrowed and shifted to the low-frequency end, the dominant frequency band of 0~1.5 Hz. The comparative analysis shows that the “frequency band narrows and shifts to low frequency” phenomenon is effective for direct foreshock identification. In the future, it is necessary to focus on the possibility of strong earthquakes occurring near the source area in the short term (1~3 months) after the frequency spectrum shift of small and medium earthquakes occurring.

Key words: Direct foreshock, FFT mean square spectrum, 2010 Yushu M_S4.7 earthquake, 2020 Maduo M_S4.2 earthquake

中图分类号:

P315.7

余娜, 孙玺皓, 张晓清. 2021年玛多M_S7.4地震与2010年玉树M_S7.1地震前频谱特征分析[J]. 地震, 2023, 43(3): 150-158.

YU Na, SUN Xi-hao, ZHANG Xiao-qing. Spectral Characteristics before 2021 Maduo M_S7.4 Earthquake and 2010 Yushu M_S7.1 Earthquake[J]. EARTHQUAKE, 2023, 43(3): 150-158.

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2021年玛多M_S7.4地震与2010年玉树M_S7.1地震前频谱特征分析

Spectral Characteristics before 2021 Maduo M_S7.4 Earthquake and 2010 Yushu M_S7.1 Earthquake

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2021年玛多MS7.4地震与2010年玉树MS7.1地震前频谱特征分析

Spectral Characteristics before 2021 Maduo MS7.4 Earthquake and 2010 Yushu MS7.1 Earthquake

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2021年玛多M_S7.4地震与2010年玉树M_S7.1地震前频谱特征分析

Spectral Characteristics before 2021 Maduo M_S7.4 Earthquake and 2010 Yushu M_S7.1 Earthquake