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Lamar County Multi- Jurisdictional Hazard Mitigation Plan <br />Chapter Three <br />4. Previous Occurrences <br />Earthquakes centered within lamar County are Rare but have occurred. The few events that <br />have been recorded are largely unfelt and are seismically rated at or below a level 2. <br />Occasionally earthquakes in this area are felt and documented. These quakes can be from <br />natural origins but many times the tremor is caused from excavation and oil exploration. Some <br />of these events include: <br />Table 4: Earthquake Possibly Felt in Lamar County, Texas <br />M <br />02/07/1812 <br />1 <br />8 <br />Tectonic <br />New Madrid, Mo <br />Speculation to <br />the formation of <br />Caddo Lake <br />10/22/1882 <br />5.6 <br />Tectonic <br />Ft. Gibson,Ok <br />Bricks Chimneys <br />were shaken <br />Loose <br />04/09/1932 <br />4 <br />Oil Exploration <br />Mexia, Texas <br />Bricks, Chimneys <br />near epicenter <br />were shaken <br />loose <br />04/12/1934 <br />4.2 <br />Tectonic <br />N. of Paris, Tx <br />04/09/1952 <br />5.5 <br />Tectonic <br />El Reno, Ok <br />03/19/1957 <br />3 <br />Oil Exploration <br />Gladewater, Tx <br />05/31/1997 <br />3.4 <br />Tectonic <br />Commerce, Tx <br />04/22/2005 <br />3.0 <br />Tectonic <br />Oklahoma <br />Source: institute for Geophysics. <br />133 <br />