New evidence of earthquake and volcano triggering by strong tides
强潮汐激发地震火山活动的新证据

At the end of June in 2000, volcanic and seismic events started at the Izu islands south to Tokyo. Following the events, extraordinary crustal deformation was observed around the Izue islands. Until the end of August, both the volcanic and seismic activities were high. It is suggested that the crustal deformation was caused by a dyke intrusion event at the Izu islands and associated with strong tides. A tidal model triggering earthquakes and volcanoes is proposed based on the observational data and calculation results. Before and after the El Nino event and La Nina event, the oceanic water in East Pacific Ocean and West Pacific Ocean may rise or fall 60cm oppositely, which make the oceanic crust fall or rise 20cm. It is the reason that the El Nino events and La Nina events are interrelated with the earthquakes and volcanoes. This phenomenon is just like "see-saw" motion. Strong tide and El Nino are the excitation condition of earthquakes and volcanoes activities.