Anomalous perturbations of the ionosphere have been observed either as
uctuations in the critical
frequency of the F-region ionosphere, foF2, or as
uctuations in the nighttime VLF signals that propagate
through the Earth Ionosphere Waveguide. All anomalies appear from an earliest of three weeks to one
day prior to an earthquake occurrence, hence leading to be used as possible presursors and aid in short
term earthquake prediction. Earthquakes of magnitude 5.5 and greater have a signi cant chance of
having associated ionospheric anomalies, and anomalies are only detected within a radius of 500km from
the epicentre. Solar events, however, greatly a ect the ionosphere and make seismogenic ionospheric
signals di cult to isolate. This study concentrates on anomalous VLF signal perturbations observed
along the propagation path between the NWC transmitter in Australia and narrowband receivers in
Budapest and Tihany, Hungary for July 2007 to February 2008. Comparisons of anomaly appearances
and seismic activity occurring within the Dobrovolsky area to the propagation path were carried out,
with anomalies being observed predominantly prior to major seismic events. / Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2013.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ukzn/oai:http://researchspace.ukzn.ac.za:10413/10639 |
| Date | January 2011 |
| Creators | Brijraj, Sahil. |
| Contributors | Collier, Andrew B. |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
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