Ionospheric precursors observed at low latitudes around the time of koyna earthquake

Details Ionospheric precursors observed at low latitudes around the time of koyna earthquake Ionospheric precursors observed at low latitudes around the time of koyna earthquake

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42.1238s&link_type=abstract

Advances in Space Research, Volume 42, Issue 7, p. 1238-1245.

Other

9

Scientific paper

On December 11, 1967 at 05:21 LT, an immense earthquake of magnitude 6.7 struck Koyna, the Indian province of Maharashtra. Its epicenter was located at geographic latitude 17.37°N and longitude 73.75°E with depth of about 3 km. Ground based measurements show variation in the critical frequency of ionospheric F2 layer (foF2) before and after the shock. In the present study the behavior of F2-region of ionosphere has been examined over the equatorial and low latitudinal region ionosphere during the month of December 1967 around the time of Koyna earthquake. For this purpose, the ionospheric data collected with the help of ground-based ionosondes installed at Hyderabad (located close to the earthquake epicenter) Ahmedabad, Trichirapulli, Kodaikanal and Trivendrum have been utilized. The upper and lower bound of Interquartile range (IRQ) are constructed to monitor the variations in foF2 other than day-to-day and diurnal pattern for finding the seismo-ionospheric precursors. Some anomalous electron density variations are observed between post midnight hours to local pre-noon hours at each station. These anomalies are strongly time dependent and appeared a couple of days before the main shock. The period considered in this study comes under the quiet geomagnetic conditions. Hence, the observed anomalies (which are more than the usual day-to-day variability) over all stations are likely to be associated with this imminent earthquake. The possible mechanism to explain these anomalies is the effect of seismogenic electric field generated just above the surface of earth within the earthquake preparation zone well before the earthquake due to emission of radioactive particles and then propagated upward, which perturbs the F-region ionosphere.

Affiliated with

Also associated with

No associations

Rating

Ionospheric precursors observed at low latitudes around the time of koyna earthquake does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Ionospheric precursors observed at low latitudes around the time of koyna earthquake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionospheric precursors observed at low latitudes around the time of koyna earthquake will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1662413