http://http://www.agu.org/pubs/crossref/1981/JB086iB06p05053.shtml
Oaxaca, Mexico, earthquake November 29, 1978
These events show an interesting spatial and temporal pattern. which culminates in the last 1.8 days of the sequence with an apparent migration of activity toward the epicenter of the impending earthquake. I think that the people there was not pay attention when the earthquake happened. And then the earthquake came and knock it down and this type of body wave simplicity for a large subduction zone earthquake is an important characteristic of the mode of strain release along some subducting plate boundaries. When the plates boundaries hit Oaxaca, Mexico and made the earthquake shake and knock it down.
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