Aeromagnetic study of the Island of Hawaii
- Author:
-
Hildenbrand, Thomas G., Rosenbaum, Joseph G., Kauahikaua, James P.
- Title:
- Aeromagnetic study of the Island of Hawaii
- Periodical:
- Journal of Geophysical Research
- Year:
- 1993
- Volume:
- 98
- Pages:
- 4099-4119
- Subject:
-
Geomagnetism secular variations
- Summary:
- Spectral-depth analysis delineates two shallow magnetic zones, each roughly 1.5 km thick, lying at a depth of 1 km. One zone lies in the center of the island and correlates with a regional magnetic high. The other zone coincides with pronounced magnetic lows paralleling Kilauea's active east rift zone. These magnetic lows probably depict rocks chemically altered by hydrothermal fluids. Analysis of magnetic terrain effects indicates that magnetization also decreases with depth within Mauna Kea and Mauna Loa. We estimate that magnetization is reduced by about half at a depth of 1 km. The magnetic method is particularly useful in delineating the lateral extent of local shield structures, such as rifts, summit calderas, pit craters, and vent fissures.
- Label:
- Geology
- Date:
- 1993
- Collection:
- Periodicals