Abstract
The changes in atmospheric ozone concentration for earthquakes (with a magnitude greater than 5.0 on the Richter scale and a depth of focus less than 35 km), which have occurred worldwide during the period from September to March for the years 1991–2006, have been studied with the help of satellite data obtained from Nimbus‐7 Total Ozone Mapping Spectrometer (TOMS), Earth probe TOMS and the Ozone Monitoring Instrument. The trend of variation in total ozone concentration after all these earthquakes was found to be similar. The ozone concentration was low on the day of the earthquake, increased gradually after the earthquake and reached a maximum value and thereafter decreased to its normal value. The increase in ozone concentration was found to be dependent on the magnitude of the quake, depth of focus, wind direction and geographical location of the epicentre.
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