EARTHQUAKE FAQ

Isoseismal Map:

Isoseismal map for the largest known events from each of the three known centers of seismic activity in the Atascosa-Karnes-Wilson County regions: the m_bLg=4.3 Fashing earthquake of 9 April 1993 (bold lines); the m_bLg=3.9 Pleasanton earthquake of 3 March 1984 (dashed lines); and the m_bLg=3.6 Falls City earthquake of 20 July 1991 (dashed lines). Bold Roman numerals indicate modified Mercalli intensity zones for the 1993 earthquake; lighter Roman numerals indicate modified Mercalli intensity zones for the 1984 and 1991 earthquakes. Small Arabic numerals indicate location of individual felt reports for the 1993 event; circled Arabic numerals indicate more than one felt report. Light long- and short-dashed lines designate county boundaries; light lines indicate highways.

from the publication:
Davis, S. D., P. A. Nyffenegger, C. Frohlich (1995) The 9 April 1993 earthquake in south-central Texas: was it induced by fluid withdrawal? Bull. Seis. Soc. Am. 85, 1888-1895.