Note: This VAL system was in use from 1977–October 1983. 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 | 3-level scale |
| Lowest level | 1 |
| Highest level | 3 |
| 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 | No |
| 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. (1977). v. 42, no. 70, 1977. https://www.govinfo.gov/content/pkg/FR-1977-04-12/pdf/FR-1977-04-12.pdf#page=152
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