Recognition Of Earthquake Precursor And Relationship Between Magnetism And Earthquakes

Earthquake prediction is a world-wide famous puzzle and it is a necessity of scientists to do research on this significant thesis. China suffers natural disasters, especially earthquake calamity, all the time from ancient times. If accurate prediction is possible, Chinese people may avoid that great loss of lives or fortune and they would not fear destructive earthquakes. To give an accurate earthquake prediction is very difficult since that there is too much information relating to earthquake and scientists could hardly distinguish precursor from artificial interference or background noise. As a result, author choose magnetic methods as a breakthrough point after reading lots of inferences.It’s possible to record geomagnetic data per second benefiting from the use of new instruments. In this paper, many methods are used to eliminate interference and then first difference method is used to analyze geomagnetic data. The frequency of anomalies gives more information than the amplitude of first difference of geomagnetic data and such operation could avoid unknown artificial inference that may existed and give a comparison with natural background.In this paper, data of some earthquakes, such as Wenchuan (2008.05.12&Mw7.9), Panzhihua (2008.08.30&Mw6), Chuxiong (2009.07.09&Mw5.7), Dangxiong (2008.10.06&Mw6.3), Nantou (2013.03.27&Mw5.9;2013.06.02&Mw6.2) and Hualian (2013.10.31&Mw6.3), are manipulated and remarkable anomalies are observed throughout decades of kilometers from the epicenter before more than ten days to more than three months. The frequency of anomalies probably hold the key to recognition of earthquake precursor. It opens the door to short-term earthquake prediction.