منابع مشابه
Are any public-reported earthquake precursors valid?
This article examines retrospective publicsupplied precursor reports statistically, and confirms published hypotheses that some alleged precursors within 100 km and within a day prior to the large 1995 Kobe and 1999 Izmit earthquakes, may be valid. The confirmations are mostly at the p<0.001 level of significance. Most significant were alleged meteorological and geophysical precursors, and less...
متن کاملFrog Swarms: Earthquake Precursors or False Alarms?
In short-term earthquake risk forecasting, the avoidance of false alarms is of utmost importance to preclude the possibility of unnecessary panic among populations in seismic hazard areas. Unusual animal behaviour prior to earthquakes has been reported for millennia but has rarely been scientifically documented. Recently large migrations or unusual behaviour of amphibians have been linked to la...
متن کاملDevelopment of Radon Gas Sensor To Monitor The Precursors of Earthquake
Radon gas is colorless, odorless and tasteless and can only be detected by testing. It naturally occurs from traces of uranium in soils and rocks. It results from the decay of trace amounts of uranium, found in most rock and soil. It is measured using special monitors and expressed in units of bequerels per cubic metre (Bq/m3) or picocuries per litre (pCi/L). The air pressure inside the laborat...
متن کاملA neuro-fuzzy approach to the reliable recognition of electric earthquake precursors
Electric Earthquake Precursor (EEP) recognition is essentially a problem of weak signal detection. An EEP signal, according to the theory of propagating cracks, is usually a very weak electric potential anomaly appearing on the Earth’s electric field prior to an earthquake, often unobservable within the electric background, which is significantly stronger and embedded in noise. Furthermore, EEP...
متن کاملPossible earthquake precursors revealed by LF radio signals
Among radio signals, low frequency (LF) radio signals lie in the band between 30–300 kHz. Monitoring equipment with the ability to measure the electric strength of such signals at field sites, were designed and assembled in Italy. From 1993 onwards, the electric field strength of the MCO (216 kHz, France) broadcasting station has been collecting measurements at two sites in central Italy that w...
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ژورنال
عنوان ژورنال: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
سال: 1989
ISSN: 0037-1114,1883-9029,2186-599X
DOI: 10.4294/zisin1948.42.4_451