From the Annals of the Temblors –  In 1931, the most powerful earthquake ever recorded in Texas shook up the good folks of Valentine in Jeff Davis County. The quake measured 6.5 on the Richter Scale which is relatively minor in the California falling into the ocean scheme of things..  No casualties were reported, but the quake caused damage to almost every wooden structure in Valentine.   The local school building was damaged beyond repair.  There were also reports of landslides as far away as the Guadalupe Mountains.

Figure showing  felt area and Modified Mercalli Intensities experienced by Texans from the Valentine earthquake from www-udc.ig.utexas.edu.