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Country: | New Zealand | |
| Subregion Name: | Kermadec Islands | ||
| Volcano Number: | 0402-022 | ||
| Volcano Type: | Submarine volcano | ||
| Volcano Status: | Fumarolic | ||
| Last Known Eruption: | Unknown | ||
| Summit Elevation: | -65 m | - 213 feet | |
| Latitude: | 30.036°S | 30°2'9"S | |
| Longitude: | 178.712°W | 178°42'45"W | |
| Giggenbach submarine volcano, named after volcano gas geochemist Werner Giggenbach, lies NW of Macauley volcano. The flat summit of the basaltic-to-dacitic volcano is cut by a 700-m-wide crater containing a central cone. The volcano reaches to within 65 m of the sea surface, and the summit is cut by numerous small explosion pits and craters. Much of the edifice is blanketed by dacitic pumice, and several edifice-collapse scarps cut its flanks. Large satellite cones are found on the ENE and SSW flanks, and a chain of eight small satellitic cones that fed recent andesitic-dacitic lava flows lies on the west flank. A large hydrothermal vent field was found within the summit crater. | |||
