Earthquakes And Rocks as Magnetic fossils to Find Evidence Possibly More Useful in Predicting Earthquakes

Siesmologists were suprised by the Tokyo earthquake since they thought the fault line near Japan wasn't so powerful to cause the magnitude 9.0 Tokohu quake. Megaquakes of 8.5 or higher seem to cluster according to records of the last 100 years. E.g. six of them were in the last decade, yet none in the thirty years before that. By current methods we can't know based on current data if this is just a fluke or relates to deeper events.

I believe we might find rocks that have been unchanged in stratigraphy since the time we want to research. The quakes we want to find may shake them so violently in the earth's magnetic field or in the field of other rocks nearby, they would help us find when the quakes occurred even over long eras of time by a sort of magnetic fossil record. If the quakes are near the spreading centers of the ocean floors they are known to register magnetic fields as the iron in the lava oozes out and solidifies. (This was one reason continental drift was eventually accepted by geologists). By the magnetic fields with reliable changes of larger quakes seen we would know if large quakes are in clusters, and so we might improve our earthquake science.