TY - JOUR
T1 - Changes in total electron content associated with earthquakes (M > 5) observed from GPS station, Varanasi, India
AU - Priyadarshi, Shishir
AU - Kumar, S.
AU - Singh, A. K.
PY - 2011/5/4
Y1 - 2011/5/4
N2 - The total electron content (TEC) derived from the global positioning system (GPS) at Varanasi (latitude 25.3° N, longitude 82.99° E), India has been measured during 2007 and 2010. We have chosen nine earthquakes (M > 5) that occurred within 2000 km of Varanasi during 2007 and 2010 to study the changes in TEC associated with these earthquakes. A monthly median (MM) of the TEC and associated inter quartile range (IQR), upper bound (UB) and lower bound (LB) are utilized as a reference for identifying abnormal signals during all nine earthquakes. The results show anomalous reductions and enhancements in the TEC. These pre-earthquake ionospheric anomalies appear within 5 days prior to earthquakes. A possible mechanism responsible for ionospheric anomalies associated with earthquakes is discussed.
AB - The total electron content (TEC) derived from the global positioning system (GPS) at Varanasi (latitude 25.3° N, longitude 82.99° E), India has been measured during 2007 and 2010. We have chosen nine earthquakes (M > 5) that occurred within 2000 km of Varanasi during 2007 and 2010 to study the changes in TEC associated with these earthquakes. A monthly median (MM) of the TEC and associated inter quartile range (IQR), upper bound (UB) and lower bound (LB) are utilized as a reference for identifying abnormal signals during all nine earthquakes. The results show anomalous reductions and enhancements in the TEC. These pre-earthquake ionospheric anomalies appear within 5 days prior to earthquakes. A possible mechanism responsible for ionospheric anomalies associated with earthquakes is discussed.
U2 - 10.1080/19475705.2011.563390
DO - 10.1080/19475705.2011.563390
M3 - Article
SN - 2411-2430
VL - 2
SP - 123
EP - 139
JO - Geomatics, Natural Hazards and Risk
JF - Geomatics, Natural Hazards and Risk
IS - 2
ER -