Investigation on the occurrence of ground ULF and its correlation to space ULF prior to the earthquake events / Mohamad Haris Salleh

This paper 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. In order to reveal possible earthquake precursor through the changes of ULF Signal, 6 sets of real time data from California region is used as a study case. The observation was made on the day of the earthquake event occur. The data was taken from Quakefinder websites which owned magnetometer station along the California fault region. The results obtained, demonstrated the theory that magnetometer may detect anomaly in ULF signal several days or a few hours before main shock. The result will be presented and broken down by the sets of data shown from previous chapter which is Set A, B, C, D, E and F. The data will be shown in the form of PC3/4 waveform and it will be broken down by the scale of the amplitude into 3 sets of graph. This graph then will be discussed on the spark in the ULF signal amplitude. The maximum and minimum amplitude will be taken from the graph which show a large anomaly and compared to the other research that have been made by researcher before to prove the existence of ULF signal anomaly before the earthquake happens.