Region
- IndiaMadhya Pradesh6
- IndiaMaharashtra6
- Maryland6
- Mississippi River Valley6
- New York (State)6
- West Virginia6
- AlaskaBrooks Range5
- Arkansas5
- California, Southern5
- China5
- Maine5
- Mexico5
- MissouriNew Madrid Region5
- New Madrid Seismic Zone5
- New Mexico5
- UtahDelta Region5
- AlaskaAlaska Peninsula Region4
- ArizonaNavajo County4
- Bombay (India)4
- CaliforniaSan Mateo County4