Responses
Posted by EQF on April 15, 2003 at 18:27:44:

John and Roger,

One of the purposes of making those data available is to try to get some university or research group to duplicate the effort at a Web site where many more data could be displayed. For example, I have a Solid Earth Tide wave in that chart. But those data are for 180W longitude, 0N latitude. The Solid Earth Tide wave has different values at different latitudes and longitudes. So perhaps 5 or more Solid Earth Tide waves should actually be shown. They could be for say, 50S, 25S, 0N, 25N, and 50N. Ocean tide data are even more location dependent.

John, you need to look at wave shapes, crest and trough locations etc. rather focus on strict definitions of terminology. Here is how some of those calculations were made:

MICA data showed were the sun, moon, and Earth were located in space each day. Day 1 location for the Earth for example was subtracted from its day 2 location to get the change in location, or “velocity” for that time. Day 1 velocity was subtracted from day 2 velocity to get acceleration for that time. And day 1 acceleration was subtracted from day 2 acceleration to get the change in acceleration, or “Impulse” for that time. Those waves have erratic shapes in all three dimensions. And that 90 degree derivative related shift in peaks that you mentioned would probably not apply here.

In response to Roger’s question about a combined force function, it presently appears to me that earthquake occurrence times are being affected by two main groups of forces, phenomena, or factors. They are sun and moon gravity related ones and environmental ones.

Most earthquakes are probably affected by the gravity forces such as the distance between the moon and the Earth, between the sun and the Earth, and Solid Earth Tide and ocean tide type forces. However the environmental factors such as the type of fault zone and its orientation, north and south or east and west usually determine how a given fault zone will respond to those gravity related forces.

It can be seen from the 3 powerful earthquakes shown in that chart that they were probably mostly affected by the gravity forces. The environmental factors were not as important.

My full chart presently displays 4 groups of earthquakes. 7 – 7.4, 7.5 – 7.9, 8 – 8+ magnitudes, and all of the earthquakes which claimed 100 or more lives for the years 1990 to the present. And I believe that they show the importance of the environmental factors. Earthquakes in a particular fault zone area such as ones in Turkey might occur not when those chart waves are at a crest but rather at specific locations on one of the waves.

So, how most earthquakes are triggered can be highly dependent on their fault zone environments. And for that reason it would be difficult to produce a force summary equation covering all earthquakes.

There is something that I find chilling about those data. For example, they indicate to me that these two destructive earthquakes were probably triggered by the same type force even though the fault zones were considerable distances apart:

2002/03/03 12:08:06 36.44N 70.45E 194.9 7.2 AFGHANISTAN
2002/02/03 07:11:29 38.56N 31.11E 10.0 6.2 TURKEY
(NEIS data)

Finally, as I have stated previously, another one of the main goals in making those data available is to try to get as many earthquake researchers around the world as possible moving in the same direction. There are people looking at moon gravity strength, ocean tides, and the Solid Earth Tide etc. Each of those and a number of other forces or phenomena can affect certain earthquakes. And you need to examine all of them at the same time to see the overall picture. That 130.html Web page chart appears to represent the first attempt that anyone anywhere has made to demonstrate what that larger picture looks like.

These are personal opinions.