| In the recent years, global disasters caused enormous economic losses and casualties. For example, Sumatra earthquake tsunami death reached 270,000 people in 2004, Myanmar tropical storm death reached 130,000 people and Chinese Wenchuan earthquake death reached 70,000 people in 2008. The severity is warning people that we must know disasters of occurrence and development scientifically and we should research and prevent disasters and reduce harm which disasters create as far as possible. Ma Zongjin points out that natural disasters prediction faces lots of problems, including multi-factors,multiplicity and uncertainty, but extensive collection of information is very important.Tidal regularity and effect are complex geophysical problems, tide and others comprehensive effect influent natural disasters. On base of the previous work, the paper describes time and space regularity of disaster chain during Pacific Decade Oscillation (PDO) cold phase and makes the following main aspects.1. Sum up relevant theories and hypothesis, including"The hypothesis of tide adjusting climate","The hypothesis of the oceanic earthquakes adjusting climate","The hypothesis of tide adjusting rainfall","The theory of solar eclipse-El Nino coefficient","The theory of earth rotation imbalance","Time and space sequence of large earthquakes disaster chain and its prediction". And introduce latest development of tidal theory and El Nino theory.2. Calculation shows that tidal latest period and its application in the global changes. The superposable calculation of lunar track parameters shows that tides have basic cycles of 1.03a, 1.1004 a, 2.0533 a, 2.2014 a, 2.2087 a, 2.2274 a, 4.9 a, 9.98 a, 18.6 a, 60.8 a. Thus they derivative periods have 3.1 a, 4.1 a, 4.9 a, 5.5 a, 5.57 a, 9 a, 9.2 a, 9.8 a, 9.98 a, 10.3 a, 11 a, 22 a, 27 a, 41 a, 52 a, 54 a, 55 a, 55.8 a, 77 a, 81 a, 108 a, 216 a, which relative to the record of climatic cycle. And the 51-56a periodic changes are multi-period composite products, which form intensive resonant period. We found that the 75 records of climate cycle include 66 records which same with tidal period, the rate is 88%, it is show that tide is the primary factor which influence on climate cycles.7Ms earthquakes on the northern Tibetan plateau have obviously sequent, the main accumulation of earthquake time interval about at: 53-54 a,26-27 a,10-11 a,3-4 a. 27 a period occur frequently, which derivatives sequent chain: 27-54-81-107-214 a; Yunnan earthquakes have 11 a,18.6 a and 22 a period; El Nino have 2.2 a, 5.5 a, 11a and 22 a period, which same as tidal period; Earth core vibration period 29.8a is three times as tidal period 9.98 a; sea temperature and Antarctic sea ice have quasi-two-year cycle. These periods prove that tidal period have control effect on earthquake, El Nino, La Nina and earth core vibration. The most remarkable change period of PDO is 50 a, the next is 5.6 a. The most remarkable change period of ENSO is 3.6 a. They have good corresponding relationships with tidal periods of 3.1 a, 4.1 a, 5.5 a, 10 a, 18.6 a, 22 a, 51 a, 52 a, 54 a, 55a and 55.8 a, it is prove that the cyclical superimposition and the model computation of this paper are accurate. The average value of tidal 3.1a and 4.1 a periods are 3.6 a, the earth rotation also has 3-4 a periods, which are relative to the ENSO 3.6 a period. The 5.57 a and 55.7 a periods indicate that the perigee tide and syzygial tide are very important in PDO.In the process of open-ocean convection in the subpolar North Atlantic Ocean, surface water sinks to depth as a distinct water mass, the characteristics of which affect the meridional overturning circulation and oceanic heat flux. In addition, carbon is sequestered from the atmosphere in the process. In recent years, this convection has been shallow or non-existent, which could be construed as a consequence of a warmer climate. Kjetil V?ge, Robert S. Pickart, Virginie Thierry, et al document the return of deep convection to the subpolar gyre in both the Labrador and Irminger seas in the winter of 2007–2008. Inclination between the Moon's path and the Equator is the largest in 2005-2007 and tide vibrates from north to south the most violently. It is a new evidence of tide adjusting climate by the tidal period of 18.6 a.The 5.57 a and 55.7 a periods are the superposition of the perigee tidal period and syzygia tidal period, the superposition makes the tidal intensity increase 80% to apogean tide, thus the superposition have remarkable influence. It is provide reasonable evidence that the days no more than three between the perigee tide and syzygial tidal are defined the strong tide. The derivative 11.14 a and 22.28 a periods of the 5.57 a period also have good corresponding relation with earth rotation speed change of 11.169 a and 22.337 a. The comprehensive analysis causes us to discover more advantageous factor, this is the innovative characteristic of this paper.3. Set up mathematical model, we obtain numerical formula and apply these results in practice. Calculation shows that rotational inertia of circle layers are constantly changing by tidal deformation, thus leading to the differential rotation of circle layers. Tidal deformation of circle layers are different, according to the calculation, velocity increment radio is 400:3:1. When new moon or full moon occurs in the equator, relative to lithosphere, the atmosphere and ocean move eastward, it is possible to La Nina; when new moon or full moon occurs in the Tropic Capricorn or the Tropic Cancer, relative to lithosphere, the atmosphere and ocean move westward, it is possible to El Nino. Model calculation also shows that tidal variation changes earth oblateness, which influence on earth rotation speed,atmosphere circulation and ocean circulation,it is conform to the actual distribution of atmospheric circulation and oceanic circulation. The regularity shows, when tidal deformation causes the earth rotation slowly, it is possible to La Nina; when tidal deformation causes the earth rotate quickly, it is possible to El Nino. Solar eclipse (include lunar eclipse) occur in the equator which conduce to formation of La Nina event. We set up mathematical model that tide and monsoon make the sea level changes and"seesawmovement"in the North Pacific crust and the Indian Ocean crust.We calculate the differential rotation of the atmosphere, ocean and lithosphere which caused by the tidal changes. When the earth flatting becomes larger, high speed air current and ocean current of equatorial plane result in the opposite direction of the earth's rotation, which similar with the equatorial easterlies; when the earth flatting becomes smaller, high speed air current and ocean current of mid-latitudes result in the same direction as the earth's rotation and, which similar with the westerlies of mid-latitudes, the processes of atmospheric and oceanic equator reduce and flow to the two poles. The regularity independents of stellar size and deformation scale. Comprehensive analysis shows that the sun in the equatorial plane, the equatorial easterlies and north-south equatorial warm oceanic current strengthened; the sun in Tropic of Capricorn or Tropic of Cancer, 35 degrees above the westerly and oceanic mid-latitude westerly strengthened. Moon tides enhance or diminish the effect. This indicated that the tide change influence atmospheric circulation and the oceanic circulation, which are one of climatic change reasons.4. Sum up latest regularities of disasters, including the relation between tide and earthquake,chilling damage,outbreaks of influenza and so on, these damages occur in the PDO cold phase, so we define the phenomena for disasters chain in the PDO cold phase. According to the data from 1889, we obtain that the PDO cold phase is the period of the concentrated outbreak of strong earthquake and low-temperature。Large earthquakes (m≥8.5) occur in this stage. During the PDO cold phase, large earthquakes and severe low temperature freezing disasters happen in an orderly way. Since 1889 earthquakes are greater than or equal to 8.5Ms altogether 21 times, from 1889 to 1924 the whole world had six earthquakes, from 1925 to 1945 had one, from 1946 to 1977 had eleven, from 1978 to 2003 had zero, from 2004 to 2007 had three, it is entered the PDO cold phase from 2000, Sumatra earthquake tsunami occurred on December 26, 2004, it is indicated that new round large earthquakes start. Using the largest global earthquake catalog available (the NEIC catalog with 442 412 events), Métivier and his co-operators observe a clear correlation (with 99% confidence) between the phase of the solid Earth tide and the timing of seismic events: earthquakes occur slightly more often at the time of ground uplift by the Earth tide, i.e. when normal stresses are reduced within the lithosphere. It is a new evidence of earthquake triggering by the solid earth tides.Comprehensive 1890-2004 data, we can get influenza pandemic climate of the six characteristics: Madre in the cold period and the phase boundary; the previous year or two years ago for the moderate-intensity above La Nina years; 20th century 50-70 at the same time as China's strong sandstorm; year or the year before and after China's northeast cold summer (50-70 in the 20th century at the same time as serious chilling damage); that moderate intensity for more than El Nino years; for the year sunspot Valley m or Peak M, m-1, m +1, or M +1. 1889-1890, 1900, 1918-1919, 1957-1958, 1968-1969, 1977 and the outbreak of avian flu have met six conditions.5. Numerical calculation shows that tidal deformation and tidal oscillations are the reason of ocean current cycles and seasonal El Nino phenomenon. The globe low-temperature damages and heavy snow have occurred frequently after Sumatra earthquake tsunami in December 26, 2004. The"hypothesis of the oceanic earthquakes adjusting climate"which issued by Guo Zengjian is a reasonable explanation. According to the theory, the globe temperature in 2005 would be lower. The scientists of the National Aeronautics and Space Administration (NASA) thought that a weak El Nino event and human-made greenhouse gases could make 2005 become the warmest year on record. It is not true for the objective testing. Now western scientists also acknowledge the objective fact that the natural climate changes from 2005 to 2006 offset globe warming effect. Lunar oscillations explain an intriguing 60-year cycle in the world's temperature. Strong tides and the great earthquakes in ocean and its margin are one of thermostats for adjusting climate. The strong earthquakes in the ocean bottom can bring the cool waters at the deep ocean up to the ocean surface and make the global climate cold. So, earthquake, strong tide and global low temperature are closely related together. In this paper, the relation of low temperature, Pacific Decadal Oscillation, the strongest earthquake, Influenza, hurricane and El Nino are discussed. In the cold period of Pacific Decade Oscillation, the strongest earthquake, hurricane with La Nina, Pandemic Influenza with El Nino will occur stronger and stronger. From 1950 to 1976, the strongest sand-dust storm is connected with Pandemic Influenza one by one. So, sand-dust storm may spread Pandemic Influenza Viruses. The strongest earthquakes will occur from 2000 to 2018 for 18 years. The strongest tides and earthquakes may occur in cycle of Quasi-four years.6.The application of solar eclipse - El Nino coefficient, the sea temperature quasi-two years periods and the tide 11a periods has forecasted the El Nino event in 2006 and the La Nina event in 2007 successfully; the proposition in 2005 that the hypothesis of"The hypothesis of the oceanic earthquakes adjusting climate"should be tested already confirms, the Indonesian Sumatra occurred three times large earthquakes continuously in 2004, 2005 and 2007, it is the fact that the climate became cold in 2008; the prediction of large earthquakes and low temperature freezing injury in the PDO cold phase from 2000 to 2035 also obtain the preliminary confirmation。Synthesize past century data of air temperature,ocean temperature, sea ice, strong earthquakes, dust storm, chilling damage, earth rotation, EL Nino, La Nina and tide, we found that strong tides, 9Ms earthquakes, chilling damage of China, influenza pandemic climate occurred regularity in the PDO cold phase, which formed an orderly disaster chain of 51-56 a period, which has practical significance for forecasting and preventing significant natural disasters.This paper makes a depth of discussion and study and obtains some conclusion of available test on tidal model calculation,tidal data analysis and tidal application, for example, occurrence regularity of great earthquakes and Large earthquakes (Ms≥8.5), orderly regularity of 7Ms earthquakes prediction occurrence regularity of chilling damages of China, influenza pandemic climate of the six characteristics, occurrence regularity of disasters chain on the PDO cold phase and so on, which have important significance on study of natural disasters and prevention of serious damages, during the PDO cold phase, great earthquakes, severe chilling damages, global influenza pandemic climate occur in an orderly way according to regularity.
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