ACRONYMS AND ABBREVIATIONS
| BP | Before present |
| CFu | Crater Flat unit |
| CHn | Calico Hills nonwelded ash flow tuff |
| DOE | U.S. Department of Energy |
| ESF | Exploratory Studies Facility |
| Ga | billion years ago |
| ka | thousand years ago |
| ky | thousands of years |
| kyr | thousand years |
| Ma | million years ago |
| M&O | Civilian Radioactive Waste Management System Management and Operating Contractor |
| MAP | mean annual precipitation |
| Md | duration magnitude (a measure of earthquake size) |
| MI | intensity derived magnitude (a measure of earthquake size) |
| ML | local magnitude (a measure of earthquake size) |
| MS | surface-wave magnitude (a measure of earthquake size) |
| Mw | moment magnitude (a measure of earthquake size) |
| NRC | U.S. Nuclear Regulatory Commission |
| PGA | peak ground acceleration |
| PGV | peak ground velocity |
| PTn | Paintbrush nonwelded bedded tuffs |
| Tac | Calico Hills Formation |
| Tcb | Bullfrog Tuff |
| Tcp | Prow Pass Tuff |
| Tct | Tram Tuff |
| TCw | Tiva Canyon welded tuff |
| Tma | Ammonia Tanks Tuff |
| Tmr | Rainier Mesa Tuff |
| Tpc | Tiva Canyon Tuff |
| Tpp | Pah Canyon Tuff |
| Tpt | Topopah Spring Tuff |
| Tptpll | Topopah Spring Tuff, lower lithophysal zone |
| Tptpln | Topopah Spring Tuff, lower nonlithophysal zone |
| Tptpmn | Topopah Spring Tuff, middle nonlithophysal zone |
| Tptpul | Topopah Spring Tuff, upper lithophysal zone |
| Tpy | Yucca Mountain Tuff |
| TSw | Topopah Spring welded devitrified ash flow tuff |