Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys
Journal of Geophysical Research B: Solid Earth
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Abstract
Measurements of subtle changes in the Earth’s gravityfield can provideinformation on the addition/loss of mass (e.g., magma or aqueousfluids) beneath a volcano. In this study, wemeasured gravity at Mount St. Helens from 2010 to 2016 to investigate possible mass changes followingthe 2004–2008 dome-forming eruption. The raw gravity measurements were corrected for changes in themass and shape of Crater Glacier and for deformation of the volcanic edifice to obtain residual gravity values.We found positive residual gravity changes that we interpret as evidence for partial recharge of the magmareservoir that fed the 2004–2008 eruption and/or for accumulation of groundwater in one or more shallowaquifers. Most of the gravity signal can be explained by groundwater accumulation; magma recharge is notrequired. However, there is additional evidence for at least partial recharge from seismic, deformation, andgeochemical observations
Suggested Citation
Battaglia, M., Lisowski, M., Dzurisin, D., Poland, M.P., Schilling, S., Diefenbach, A., and Wynn, J., 2018, Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys: Journal of Geophysical Research B: Solid Earth, v. 123, no. 2, p. 1856-1874, https://doi.org/10.1002/2017JB014990.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys |
| Series title | Journal of Geophysical Research B: Solid Earth |
| DOI | 10.1002/2017JB014990 |
| Volume | 123 |
| Issue | 2 |
| Publication Date | February 10, 2018 |
| Year Published | 2018 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Volcano Science Center |
| Description | 19 p. |
| First page | 1856 |
| Last page | 1874 |
| Country | United States |
| State | Washington |
| Other Geospatial | Mount Saint Helens |