Skip to main content
← Back to map
⇄ Compare

Yonemaru-Sumiyoshiike

Maar · Japan · 40m

The 500-m-wide Sumiyoshiike maar formed about 7,000 years ago. Sumiyoshiike and Yonemaru are two maars that formed in coastal lowland deposits N of the Aira caldera during a period of rising sea level at the beginning of the Holocene. The larger 1.2-km-wide Yonemaru maar erupted about 2 km W of Sumiyoshiike about 6,500 years ago.
The 500-m-wide Sumiyoshiike maar formed about 7,000 years ago. Sumiyoshiike and Yonemaru are two maars that formed in coastal lowland deposits N of the Aira caldera during a period of rising sea level at the beginning of the Holocene. The larger 1.2-km-wide Yonemaru maar erupted about 2 km W of Sumiyoshiike about 6,500 years ago. · Photo: Copyrighted photo by Yoshihisa Kawanabe (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
Maar
Country
Japan
Region
Western Pacific Volcanic Regions / Ryukyu Volcanic Arc
Elevation
40m
Coordinates
31.771, 130.592
Last eruption
-6200
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Minor (Basaltic)
Major rock type
Basalt / Picro-Basalt
Geological summary

Yonemaru and Sumiyoshiike are basaltic maars formed in coastal lowland deposits north of the Aira caldera, on the SW and SE flanks of the small Pleistocene Aojiki cone. The three features are also known as the Kamo Volcanic Field. The maar eruptions occurred during a period of rising sea level at the beginning of the Holocene. The 500-m-wide Sumiyoshiike was created about 7,000 years ago. The larger, 1.2-km-wide Yonemaru erupted about 2 km W of Sumiyoshiike about 6,500 years ago and produced pyroclastic surges that traveled 4 km from the vent.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
6250 BCE~6245 BCE · 1 eruptions · max VEI 26205 BCE~6200 BCE · 1 eruptions · max VEI 36250 BCE6240 BCE6225 BCE6215 BCE6205 BCE

Detailed timeline

  1. 6200 BCEVEI 3Geological estimate
    BCE 6200 – Ongoing
    Yonemaru
  2. 6250 BCEVEI 2Geological estimate
    BCE 6250 – Ongoing
    Sumiyoshi-ike

External links

⚠ For reference only. Not for emergency response.