强震临震微波动: 来自于震源的信息？

doi:10.12196/j.issn.1000-3274.2024.04.011

摘要/Abstract

摘要： 简要回顾了强震临震微波动研究的科学问题、分析思路、主要特征和多年实时震情跟踪实践结果, 总结了临震微波动主要特征, 表现为: ① 优势频率为11～16 Hz, 频谱形态较为整齐; ② 可能出现在震前2～24 d, 可以被震中距70 km半径范围内的台站记录到; ③ 具有重现性, 在多次强震前出现; ④ 可能与震级有关, 震级越大, 震前出现临震微波动的可能性越大。介绍了2021年云南漾濞6.4级地震和2021年青海玛多7.4级地震余震活动阶段观测到临震微波动的新结果, 做出了强震临震微波动可能来自于震源区或地震破裂带的推测。

关键词: 强震, 临震微波动, 优势频率11～16 Hz, 重现性, 来源于震源区, 或地震破裂带

Abstract: This paper briefly reviews the scientific issues, analytical methods, main features, and results of years of real-time earthquake tracking practice on impending strong earthquake microfluctuations. The main characteristics of impending earthquake microfluctuations are summarized as follows: ① The dominant frequency is 11~16 Hz, and the spectrum shape is relatively neat; ② It may appear 2~24 days before the earthquake, and can be recorded by stations within a radius of 70 km of the epicenter; ③ It is reproducible and appears before multiple strong earthquakes; ④ It may be related to the magnitude of the earthquake. The greater the magnitude, the greater the possibility of impending earthquake microfluctuations before the earthquake. This paper introduces the new results of microfluctuations observed during the aftershock activity of the 2021 Yangbi M6.4 earthquake and the 2021 Maduo M7.4 earthquakes. It is inferred that the microfluctuations of imminent strong earthquakes may originate from the hypocentral area or the earthquake rupture zones.

Key words: Strong earthquakes, Microfluctuations of imminent, Dominant frequency 11~16 Hz, Reproducibility, Originating from earthquake source hypocentral area, or earthquake rupture zone

中图分类号:

P315.7

杨立明, 王建军, 郝臻. 强震临震微波动: 来自于震源的信息？[J]. 地震, 2024, 44(4): 173-182.

YANG Li-ming, WANG Jian-jun, HAO Zhen. Microfluctuations in Impending Strong Earthquakes: Information from the Hypocentral Area?[J]. EARTHQUAKE, 2024, 44(4): 173-182.

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