Investigation on the occurrence of Ground ULF and its correlation to space ULF prior to the earthquake events

Abstract

This project focuses on the occurrence of Ground ULF signal prior due to the fact that ULF frequency band is considered as most promising frequency range in ground base observation where electromagnetic earthquake precursors may be found hence the study of ULF magnetic wave is very significant. An earthquake (also known as a tremor or temblor) is the result of a sudden release of energy in the Ear th's crust that creates seismic waves. In order to reveal possible earthquake precursor through the changes of ULF signal, 2 set of real time data from California region is used as a study case. The data was taken from Quakefinder websites which owned magnetometer station along the California fault region. The observation was made several days before and on the day of the earthquake event occurred. The results obtained, demonstrated the theory that magnetometer may detect anomaly in ULF signal several days or a few hours before main shock. The data is shown in the form of Pc3/4 waveform and it is broken down by the scale of the amplitude into graph. The maximum and minimum amplitude taken from the graph showed anomaly of ULF and its correlation to space ULF have been discussed.