We begin with a simple daily count of all quakes 4+ and display these against the backdrop of the Moon's monthly Full-New Cycle.  Since we are going to observe each day, we must expand our vision into another giant scroll chart.

World Daily Quake Frequency 4+ 1973-2007
Correlated With Lunar Perigee & Full Moon
expanded giant by MWM
quakes4+_daily_world_1973-2007_correlate_moonorbit_expanded.gif
model source:  ANSS database; world_quake_summary.xls by MWM

This next chart connects us with both the Full Moon Cycle and the monthly variations in its orbit which brings it closer to the Earth (Lunar Perigee) and farther away from the Earth (Lunar Apogee).

Average line added

Perigee size directly connects with the full moon in the following sequence

four small Perigees - the middle two which share the shortest apogee have preety much the same size of Perigee and are perfectly out of phase 180 with the Full Moon

two equi-size smallest perigees - transitional falling into phase

seven large Perigees  = are all in phase with Full Moon, three within hours, four within plus or minus 2 days.

two equi-size smallest perigees - transitional falling out of phase

ditto  - this pattern is pretty inelastic marches through the years in the same repeating pattern.  partly this rigidity is probably mathematical artifact of the emphermis builders.  the real moon probably is a tad more variable.

so the basic solar cycle is 15 lunations at 29 days each

which is of course, very nearly exactly one wobble cycle of 435 days

so one "earth year" is = 15 moons or 435 days

or in other words, the wobble is driven very rigidly by the Moon.

makes a every interesting, distinctive trend line.

one clear consequence:  the wobble cycle is not a solar cycle

but something must pump the moon...what is pumping the moon?

the four smallest Perigees tend to have less surge activity than the four transistional perigees.

Now...

Now the next latest next chart

World Daily Quake Frequency  4+ 1973-2007
Correlated With Lunar Declination, Perigee & Full Moon; 
expanded giant by MWM
quakes4+_daily_world_1973-2007_correlate_mooncycle_expanded.gif
model source:  ANSS database; world_quake_summary.xls by MWM

Now we complete the Lunar orbit cycles (well, at least the main ones) by adding the distance of the Moon above or below the Equator, which varies significantly over an 18 year cycle called the Saros Cycle.

World Daily Quake Frequency  4+ 1973-2007
Paralleled With Earth's Wobble
landscape webpage chart by MWM
quakes4+_world_correlate_wobble_expanded_1973-2007.gif
model source:  ANSS database; world_quake_summary.xls by MWM

This graph provides five hints of the connection between Earth's wobble, plate motion, and quake activity.  Enough can be seen to deserve a detailed statistical analysis.  One connection can be seen with the seven year rise and fall in the size of the Wobble (so-called Chandler Amplitude).  Quake activity has a similar humping or ~seven year modulation, though a little delayed. 

Another connection can be seen in the phasing of the greatest surges of earthquake activity with some (but not all) of the periods of the smallest size of the Wobble (X MIN).  A third parallel can be seen with the tendency of the greatest peaks of quake activity to occur during the lowest "valleys" in the waveform of the spiral.  These valleys are mathematically defined as -x numbers, which indicates that the North Spin Axis has wobbled its location as far from England as it can get, sometimes by as much as a few tens of meters, over into the "Pacific Hemisphere" side of the Earth.

A fourth parallel can be seen in the clear tendency of the rising trend of global quake activity to "step function" up during  the Wobble MIN phases and add permanently an accelerated level of activity.  This can be detected visually very nearly from the beginning of the graph in 1973.  This obviously occurred in spades during the last Wobble MIN phase of 2005/2006.

From all of this, one has strong evidence to argue that each seven year cycle in the Wobble has created an acceleration of the Global Trend.  After 1981, one can see visually that the Wobble "clumps" have shadow "clumps" of seismic activity.  As the Wobble gets bigger in size on average, the overall daily frequency appears to increase, on average.   There is however, some lag in the shadow effect.  And, this "shadow" cannot be seen 1973-198o

These parallels we can sense without numbers courtesy of the compressive qualities of the spreadsheet graph logic.  The Wobble spiral size is defined by the Polar X Axis Coordinate (nearly identical with Greenwich Meridian) in a daily series and is plotted directly with the daily earthquake frequency of all activity 4+.  The graph logic compresses the data for over 12,000 dates into this one page display and allows us to see the connections.

This is visually apparent enough to justify significant statistical analysis.  Can one define the "correlation co-efficient".  Can one define the "acceleration efficient", the amount of the acceleration of the Global Trend?  From this can one deduce an exponential growth curve?  Apparently so.  But doing so is NOT TRIVIAL and is beyond my mathematical skills.  One needs to compare two moving averages.  A moving average for quakes can be fairl....

World Daily Quake Frequency  4+ 1973-2007
Paralleled With Earth's Wobble
expanded scroll chart by MWM
quakes4+_world_correlate_wobble_expanded_1973-2007.gif
model source:  ANSS database; world_quake_summary.xls by MWM

This may be of use somehow.  It simply expands the chart above to bring perspective down into nearly a monthly view.  In this view, the connection of earthquakes with the rhythm and phasing of the wobble is fairly well lost.  This is the perspective most people have.

this chart is missing xxx edit -does it matter?