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Naruko

Caldera · Japan · 470m

Katanuma lake in the 5.5 x 7 km Narugo caldera is seen from its NW shore with Ogadake lava dome on the right-center horizon. It is the highest of a cluster of lava domes surrounding the lake at 470 m above sea level. Katanuma is one of the most acidic crater lakes in Japan, with a pH of 1.6, and sulfur is mined from sediments on the lake floor.
Katanuma lake in the 5.5 x 7 km Narugo caldera is seen from its NW shore with Ogadake lava dome on the right-center horizon. It is the highest of a cluster of lava domes surrounding the lake at 470 m above sea level. Katanuma is one of the most acidic crater lakes in Japan, with a pH of 1.6, and sulfur is mined from sediments on the lake floor. · Photo: Copyrighted photo by Jun'ichi Itoh (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/). · Wikimedia Commons
Type
Caldera
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
470m
Coordinates
38.729, 140.734
Last eruption
837
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Cluster
Major rock type
Rhyolite
Geological summary

Naruko is a poorly defined, 5.5 x 7 km caldera NW of the city of Sendai. Formed during eruptions about 73,000 and 45,000 years ago, it contains a cluster of four dacitic lava domes of Holocene age surrounding the 400-m-wide lake-filled Katanuma crater. The highest of the low, but steep-sided lava domes, Ogadake, lies SE of the lake and reaches only 470 m above sea level. Ogadake and Kurumigadake domes are capped by conglomerates and mudstones uplifted during dome growth. The only recorded eruption in occurred in 837 CE. Water vapor and sulfur-dioxide gas emission occurs from Shurado crater on Toyagamori lava dome west of the lake and from the bottom of the crater lake, which is one of the most acidic in Japan, with a pH of 1.6. Solfataras are found on the western shore of Katanuma, and sulfur is mined from sediments on the lake floor.

From Wikipedia

Naruko is a stratovolcano located in Ōsaki, Miyagi Prefecture, Japan. The volcano consists of a 7 km wide caldera with several lava domes. The summit of the 470 m high Mt. Kurumigatake is one of the four lava domes located in the center of the caldera. The volcano is well known because of its relationship to the Naruko Hot Springs Villages. However, its lack of well-defined features makes it difficult to recognize for a casual observer. The Japan Metrological Agency considers Naruko to be an active volcano.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
4400 BCE~4206 BCE · 1 eruptions · max VEI ?1491 BCE~1297 BCE · 2 eruptions · max VEI ?909 BCE~715 BCE · 1 eruptions · max VEI ?643~837 · 1 eruptions · max VEI 14400 BCE3042 BCE1878 BCE521 BCE643

Detailed timeline

  1. 837VEI 1Observed
    837-05-27 – Ongoing
  2. 800 BCEVEI ?Geological estimate
    BCE 800 – Ongoing
  3. 1350 BCE (±50 yrs)VEI ?Geological estimate
    BCE 1350 – Ongoing
  4. 1400 BCEVEI ?Geological estimate
    BCE 1400 – Ongoing
  5. 4400 BCEVEI ?Geological estimate
    BCE 4400 – Ongoing

External links

⚠ For reference only. Not for emergency response.