Note: This VAL system was in use from October 1983–2004. The current VAL system can be found here.
Agency: United States Geological Survey (USGS)
Name: Hazard statements
Elements of VAL system
| Domain | Terrestrial |
| Volcano | All |
| Scheme range | 1-level scale |
| Lowest level | 1 |
| Highest level | 1 |
| Level name type | Word |
| Level for lack/loss of monitoring | No |
| Volcanic activity | No |
| Hazards possible | No |
| Locations affected | No |
| Potential impacts | No |
| Forecast language | Yes |
| Timing language | Yes |
| Actions to take | No |
| Agency actions | Yes |
| Link to evacuations | No |
| Reporting frequency per level | No |
| Link to monitoring thresholds | No |
| Step-up and step-down language | No |
Related References
Federal Register. (1983). v. 48, no. 197, 1983. https://dn710104.ca.archive.org/0/items/sim_federal-register-find_1983-10-11_48_197/sim_federal-register-find_1983-10-11_48_197.pdf#page=108
Hill, D. P., Mangan, M. T., & McNutt, S. R. (2017). Volcanic unrest and hazard communication in Long Valley volcanic region, California.In: Fearnley, C.J., Bird, D.K., Haynes, K., McGuire, W.J., Jolly, G. (eds) Observing the Volcano World. Advances in Volcanology. Springer, Cham. (pp. 171-187). https://doi.org/10.1007/11157_2016_32