posted on Mar, 10 2011 @ 08:48 PM
Did anyone ever figure out what was going on? I can only add that vast areas of the US are being surveyed for Oil and Gas using seismic study, this
process places explosive charges at regular intervals over large areas of land, charges are set at regular intervals. These studies take place from
weeks to months with simultaneous detonation of the charges with the goal to shake the ground from the surface to several miles down, these test are
repeated on the same area day after day after day as readings are taken from a few dozen to hundreds of locations in the study depending on the size
of the area. The readings are done independent of each other which is why it can take weeks to months to complete as the reading must be take at
distance from a charge. This process generates 3 dimension images of the earth under the study to better identifying where Oil and Gas is trapped.
These types of studies have only been done in the last decade or so, and due to cost originally were done seldom, but with the increased cost of Oil
and Gas and Drilling it is cost effective today and is the standard method today. Also these are done at night usually, to increase the accuracy of
the readings a semi chugging down the road can alter the readings, so late at night low traffic low noise in general makes it better. I suspect that
this is actually what you were hearing and the USGS would see it but also know it wasn't an earthquake, I would also think local law enforcement
would know about it since they many times block roads during the tests. Of course Osage County is next door and The Shidler Field is in Osage County
the largest Oil find ever in Oklahoma, so if it was being done in Osage you would be able to hear that and even feel it a county over if the geology
is right, and local law might not know anything about it.