Extraction of two tsunamis signals generated by earthquakes around the Pacific rim

As one of the ocean sudden natural disasters,the tsunami is not easily to differentiate from the ocean variation in the open ocean due to the tsunami wave amplitude is less than one meter with hundreds of kilometers wavelength. But the wave height will increases up to tens of meters with enormous energy when the tsunami arrives at the coast. It would not only devastate entire cities near coast,but also kill millions of people. It is necessary to forecast and make warning before the tsunami arriving for many countries and regions around the Pacific rim. Two kinds of data were used in this study to extract the signals of 2011 Tohoku tsunami and 2014Iquique tsunami. Wave undulations from DART（ Deep-ocean Assessment and Reporting of Tsunamis） buoys and SLA from altimetry could extract the tsunami signals generated by this two earthquake. The signals of Tohoku tsunami were stronger than that of Iquique tsunami probably due to the 2011 Tohoku tsunami was generated by a magnitude 9. 0 earthquake and the 2014 Iquique tsunami was triggered by a magnitude 8. 2 earthquake.