强震临震微波动:来自于震源的信息?
Microfluctuations in Impending Strong Earthquakes:Information from the Hypocentral Area?
杨立明 1王建军 2郝臻2
作者信息
- 1. 中国地震局第二监测中心,陕西西安 710054
- 2. 甘肃省地震局,甘肃兰州 730000
- 折叠
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2～24d,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.
Abstract
This paper briefly reviews the scientific issues,analytical methods,main fea-tures,and results of years of real-time earthquake tracking practice on impending strong earthquake microfluctuations.The main characteristics of impending earthquake mi-crofluctuations 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 repro-ducible and appears before multiple strong earthquakes;④ It may be related to the magni-tude of the earthquake.The greater the magnitude,the greater the possibility of impend-ing earthquake microfluctuations before the earthquake.This paper introduces the new re-sults 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 microfluctua-tions of imminent strong earthquakes may originate from the hypocentral area or the earth-quake rupture zones.
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/地震破裂带Key words
Strong earthquakes/Microfluctuations of imminent/Dominant frequency 11～16 Hz/Reproducibility/Originating from earthquake source hypocentral area/Earthquake rupture zone引用本文复制引用
出版年
2024
NETL
NSTL
万方数据