Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Naruko
Katanuma lake in Narugo caldera is seen from its NW shore with Oga-dake lava dome forming the peak in the distance on the right-center horizon. Oga-dake, the highest of a cluster of lava domes surrounding the lake, is only 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. Narugo (also known as Naruko) is a poorly defined, 5.5 x 7 km caldera NW of the city of Sendai; its only known historical eruption took place in 837 CE. Copyrighted photo by Jun'ichi Itoh (Japanese Quaternary Volcanoes database, RIODB, and Geol Surv Japan, AIST,
Volcano Number:283200
Volcano Name:Naruko
Volcano Type:Caldera
Last Eruption:837
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:54771
Pop. within 10km:54771
Pop. within 30km:210262
Pop. within 100km:4417058

Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
283200 Naruko 17990 Confirmed Eruption Radiocarbon (corrected) -4400
283200 Naruko 17991 Confirmed Eruption Tephrochronology -1400
283200 Naruko 17992 Confirmed Eruption Radiocarbon (corrected) -1350
283200 Naruko 17993 Confirmed Eruption Radiocarbon (corrected) -800
283200 Naruko 17994 Confirmed Eruption 1 Historical Observations 837/5/27
Emissions Data from the Global Volcanism Program of the Smithsonian Institution No emissions data found for this volcano.

Data from the Earthchem Portal

Data from the SESAR Database

Data from the MaGa Database
Location: Katanuma volcanic lake (View Details at MaGa DB)
Description: Katanuma is a crater lake with strong acid water (pH:2.0–2.2) influenced by the volcanic fluids. The lake forms an ellipse of 462 m E-W length and 326 m N-S breadth, with a 1380 m of shore line it has neither inflowing nor outflowing streams. In the bottom of the lake there are some high temperature zones where hot springs flow out. These zones are located at the south and northeast basins of the lake’s deepest area. Degassing through the lake surface occurs by bubbles (convective/advective degassing) or by diffusion through the water/air interface (Mazot and Taran, 2009).
Hazard Description: not reported
Type: lake
Region: Miyagi Prefecture, Japan
Country: Japan
Volcanic Complex: Katanuma
Gas Flux Data:
Measurement Name Detail Specie Flux Std. Dev. Unit of Measure
Katanuma_01082010 Detail CO2 1.4 0 Mg/d
Katanuma_01082010 Detail CO2 17 0.6 Mg/d