AKA: none
Other ID: Ofu USGS-NPS Study
Status: Pending
Organization(s): USGS, Pacific Coastal and Marine Science Center
Funding Program(s): Past, Present and Future Coral Reefs (ZP00FRV)
Principal Investigator(s): Ferdinand Oberle
Affiliate Investigator(s): Eric Brown (NPS)
Information Specialist(s): Joshua Logan
Data Type(s): Sampling: Chemistry, Electro-Magnetic: Resistivity, Environmental Data: Radon, Environmental Data: Temperature, Environmental Data: Tide, Environmental Data: Wave, Imagery: Other Imagery
Scientific Purpose/Goals: Investigate geophysical controls on algal outbreaks over NPS coral reefs
Vehicle(s): None
Start Port/Location: Ofu, American Samoa
End Port/Location: Ofu, American Samoa
Start Date: 2020-01-30
End Date: 2022-08-10
Equipment Used: sampling equipment, Supersting R8, CT sensor, radonmonitor, FLIR thermal camera
Information to be Derived: Investigate geophysical controls on algal outbreaks over NPS coral reefs
Summary of Activity and Data Gathered: USGS Thermal Tower Reef Camera Timestack, Papaloloa, Ofu, American Samoa
Staff: Cordell Johnson, Rachel Marcuson
Affiliate Staff:
Notes: Entries for this field activity are based on entries from Field Activity 2020-601-FA
Data available at doi:10.5066/P19NRBZS
Location:
Ofu, American Samoa
| Boundaries | |||
|---|---|---|---|
| North: -14.06465236 | South: -14.40275938 | West: -170.89782715 | East: -169.33776855 |
Platform(s):
 Kayak |  on foot |
Oberle, F.K., Johnson, C., Logan, J.B., Storlazzi, C.D., 2025, USGS Nearshore Electrical Resistivity Tomography (ERT) profile data: U.S. Geological Survey data release, https://www.sciencebase.gov/catalog/item/67cb2b30d34ed37377098966.
Oberle, F.K., Prouty, N.G., and Storlazzi, C.D., 2025, Nearshore seawater-column measurements of coastal groundwater discharge, Ofu, American Samoa, February 2020: U.S. Geological Survey data release, https://www.sciencebase.gov/catalog/item/67e2f32cd34ee7f142216d0c.
Oberle, F.K., Nowacki, D.J., Marcuson, R.K., Johnson, C., Storlazzi, C.D., Logan, J.B., Cheriton, O.M., 2024, USGS Thermal Tower Reef Camera Timestack, Papaloloa, Ofu, American Samoa: U.S. Geological Survey data release, https://doi.org/10.5066/P19NRBZS.
Prouty, N.G., 2025, Water and algal chemistry measurements collected from the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit: U.S. Geological Survey data release, https://doi.org/10.5066/P1DVZPUV.
| Survey Equipment | Survey Info | Data Type(s) | Data Collected |
|---|---|---|---|
| sampling equipment | --- | Biology Chemistry Geology Experiments (biological) Sediment Properties | |
| Supersting R8 | --- | Resistivity | Nearshore Electrical Resistivity Tomography (ERT) profile data, Ofu, American Samoa, February 2020 (Along-shore surface-based 2D electrical resistivity tomography (ERT) surveys were collected in the nearshore region of Ofu, American Samoa.) |
| CT sensor | --- | Conductivity Temperature | |
| radonmonitor | --- | Radon | Nearshore seawater-column measurements of coastal groundwater discharge, Ofu, American Samoa, February 2020 (In-situ nearshore seawater measurements of dissolved radon and water level were used to determine the advection rate of groundwater onto the fringing reef off Ofu, American Samoa.) |
| FLIR thermal camera | --- | Other Imagery |
