Microfluctuations in Impending Strong Earthquakes:Information from the Hypocentral Area?
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.
Strong earthquakesMicrofluctuations of imminentDominant frequency 11～16 HzReproducibilityOriginating from earthquake source hypocentral areaEarthquake rupture zone
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