Giggenbach Volcano - John Seach


Kermadec Islands, SW Pacific

30.036 S, 178.712 E
summit elevation -65 m
submarine volcano

Giggenbach Volcano is located in the Kermadec Islands, 800 km NNE of the North Island of New Zealand.

It is a shallow water silicic volcano. Giggenbach is bimodal in composition - basalt and dacite. A shallow water crest less than 200 m depth contains numerous explosion pits and craters. These pit crater structures are located around the inner caldera rim, and are typically 30-50 m in diameter, and are at least 15-20 m deep.

A submersible dive in 2005 found diffuse low temperature venting along a NE/SW line bisecting the main cone. The most vigorous field vented at 205°C. Large numbers of chimney structures were found, and were primarily composed of siliceous material containing sulphide, or possibly pyrite.

Giggenbach Volcano Eruptions

No recent eruptions.