| New Search |
| Fault Name | State |
|---|---|
| Red Rock Hills fault | Montana |
| GEOMETRY | |
| Dip (degrees) | 40/50/60 |
| Dip direction | W |
| Sense of slip | normal |
| Rupture top (km) | 0 |
| Rupture bottom (km) | 15 |
| Rake (degrees) | -90 |
| Length (km) | 11 |
| MODEL VALUES | |
|---|---|
| Probability of activity | 1 |
| Minimum magnitude | n/a |
| Maximum magnitude | 6.27 |
| b-value | n/a |
| Assigned Dip | Fault-Parallel Slip Rate | Width | Annual Rate | a-value | Branch Weight |
|---|---|---|---|---|---|
| 40 | 0.26 | 23.3 | 6.96e-04 | n/a | 0.2 |
| 50 | 0.22 | 19.6 | 4.90e-04 | n/a | 0.6 |
| 60 | 0.20 | 17.3 | 3.83e-04 | n/a | 0.2 |
| Comments |
|---|
| Assigned preferred vertical slip rate based on 3-4 m of offset of late Pleistocene fan thought to be 12-35 ka (Ostenaa and Wood, 1990 #318). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006). |
| Selected References |
|---|
| Ostenaa, D., and Wood, C., 1990, Seismotectonic study for Clark Canyon Dam, Pick-Sloan Missouri Basin Program, Montana: U.S. Bureau of Reclamation Seismotectonic Report 90-4, 78 p., 1 pl. |