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James Healy Seamount

Healy

成層火山 · New Zealand · 980m (海底)

A bathymetric map of Healy submarine volcano is overlain by dive tracks of the submersible vehicle Pisces V. Dive depths range from 1,120 to 1,490 m. The resolution of the bathymetry data is 25 m, and the contour interval is 20 m. Roughly 600-year-old pumice deposits found on the shores of North Island, New Zealand, originated from Healy. The bathymetry data were obtained during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec Arc.
A bathymetric map of Healy submarine volcano is overlain by dive tracks of the submersible vehicle Pisces V. Dive depths range from 1,120 to 1,490 m. The resolution of the bathymetry data is 25 m, and the contour interval is 20 m. Roughly 600-year-old pumice deposits found on the shores of North Island, New Zealand, originated from Healy. The bathymetry data were obtained during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec Arc. · 写真: Image courtesy of New Zealand-American Submarine Ring of Fire 2005 Exploration, NOAA Vents Program. · Wikimedia Commons
タイプ
成層火山
国
New Zealand
地域
Tonga-Kermadec Volcanic Regions / Southern Kermadec Volcanic Arc
標高
980m (海底)
座標
-35.004, 178.973
最終噴火
1360年
テクトニクス環境
Subduction zone / Oceanic crust (< 15 km)
火山地形
Composite
主要岩石
Dacite
地質学的概要

Healy submarine volcano lies along the South Kermadec Ridge and consists of an elongated edifice with a 3 x 4 km wide caldera at the NE end whose rim reaches to 1,150 m below sea level. A smaller caldera lies to the SW, and a cone, Cotton volcano, rises to 980 below sea level at the SW end of the 15-km-long complex. The flat-lying floor of the larger NE caldera lies 250-400 m below the caldera rim. Rhyodacitic pumice deposits mantle the caldera floor and walls, as well as the flanks. Active hydrothermal venting has been observed on the lower part of the southern caldera wall. The roughly 590-year-old sea-rafted Loisels Pumice deposit found in many Holocene beach sequences of North Island, New Zealand, and as far away as the Chatham Islands, 650 km east of New Zealand, is chemically and texturally similar to pumices from Healy caldera.

Wikipedia の要約

英語版の要約

James Healy Seamount is a submarine volcano located among the South Kermadec Ridge Seamounts south of New Zealand's Kermadec Islands. It consists of a volcanic cone that reaches a depth of 1,150 metres (3,770 ft) below sea level, two 2–2.5-kilometre-wide (1.2–1.6 mi) and 1.3-kilometre-wide (0.81 mi) calderas, and a parasitic cone that reaches a depth of 950 metres (3,120 ft) below sea level. The flanks of the volcano are covered with pumice and volcanic rocks, and hydrothermal venting occurs inside the caldera.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
1360~1360 · 1件 · 最大 VEI ?13601360136113611361

詳細タイムライン

  1. 1360年 (±75年)VEI ?地質学的推定
    1360 ~ 進行中
    Healy caldera

外部リンク

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