1. All seismically induced water-level fluctuations other than tsunamis.
2. Applies to seismically induced fluctuations in wells, streams, lakes, ponds, and reservoirs.
3. Groundwater level changes in response to earthquake activity.
4. The role of water in the generation of intraplate seismicity.

When a massive undersea earthquake in the Indian Ocean generated deadly tsunamis December, 2005, some groundwater monitoring wells recorded the catastrophic event in the United States.