• Monu Raghuwanshi
• Dr. Shailesh Raghuwanshi
• Dr. Rahul Shrivastava
• Dr. S.K. Jain
• Prof. A.K. Gwal

Anomalous variations in ionospheric parameters associated with large (M ≥ 6) earthquakes can be considered as short term earthquake precursors. The main concern of this study is to analyze the foF2 datasets by using the cross correlation method to find a reliable precursor for the seismic activities in Japan region. Further we also filtered our data by using wavelet transform based matching pursuit MATLAB technique to denoise data and find out approximation value. These seismic activities took place on 14-03-2012 and 07-12-2012 and we analyzed the datasets of foF2 for a certain time lapse. The results show that the pre-earthquake ionospheric anomalies appear during 5 to 8 days prior to main shock and they are showing strong agreement with seismic activity in the absence of any geomagnetic activity. The changes in the F layer density may be interpreted as a result of associated seismic electric field generated by internal gravity waves and also the radon gas plays the major role.

Earthquakes, Seismic Activities, Ionosphere, Critical Frequency, Cross Correlation Analysis.

"Cross Correlation Analysis of Ionospheric foF2 Parameter during the Seismic Activities in Japan Region ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.311-316, June 2019, Available :http://www.jetir.org/papers/JETIR1908987.pdf

"Cross Correlation Analysis of Ionospheric foF2 Parameter during the Seismic Activities in Japan Region ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp311-316, June 2019, Available at : http://www.jetir.org/papers/JETIR1908987.pdf