TABLE 6.1 Criteria to Determine if Injection May Cause Seismicity
|Question||NO APPARENT RISK||CLEAR RISK||Texas City, Texas||Tracy, Quebec||Denver RMA, Colorado|
|1a||Are large earthquakes (M ≥ 5.5) known
in the region (within several hundred km)?
|1b||Are earthquakes known near the injection
site (within 20 km)
|1c||Is rate of activity near the injection site
(within 20 km) high?
|2a||Are faults mapped within 20 km
of the site?
|2b||If so, are these faults known to
|2c||Is the site near (within several hundred
km of) tectonically active features?
|State of Stress|
|3||Do stress measurements in the region
suggest rock is close to failure?
|4a||Are (proposed) injection practices
sufficient for failure?
|4b||If injection has been ongoing at the
site, is injection correlated with
the occurrence of earthquakes?
|4c||Are nearby injection wells associated
|TOTAL “YES” ANSWERS||0||10||1||5||4|
aAssumes stress measurements completed prior to survey.
NOTE: RMA, Rocky Mountain Arsenal.
SOURCE: Davis and Frohlich (1993).