Soil Volatile Hg, As, B and NH3 Distribution Prior the 2001 Eruption at Usu Volcano, Japan

Details Soil Volatile Hg, As, B and NH3 Distribution Prior the 2001 Eruption at Usu Volcano, Japan Soil Volatile Hg, As, B and NH3 Distribution Prior the 2001 Eruption at Usu Volcano, Japan

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.v21b1200q&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #V21B-1200

Other

8400 Volcanology, 8409 Atmospheric Effects (0370), 8419 Eruption Monitoring (7280), 8424 Hydrothermal Systems (8135), 8494 Instruments And Techniques

Scientific paper

Usu volcano is one of the most active volcanoes in Japan, and eight major eruptions have been recorded at this volcano since 1963. It is located in the southwestern part of Hokkaido. The volcano is a post-caldera cone of Toya caldera, and composed of a somma volcano with a parasitic scoria cone and a number of lava domes and cryptodomes. A regular repetition of the eruptions of Usu at an interval of 30-50 years in later historic times is an important aspect for the surveillance and monitoring of this volcano. The most recent one occurred in March 31, 2000. A soil volatile Hg, As, B and NH3 survey of 150 sampling sites was carried out at Usu in September 1998, 18 months prior the 2000 eruption. Soil samples were collected at 40 cm depth to avoid the soil organic rich layer. Soil samples were air dried and sieved (< 2mm). Hg, As and B measurements were performed by means of ICP in soil extractions whereas NH3 was measured by means of ISE. Soil As, B, Hg and NH3 contents ranged from 91.5 to 12,442 ppb, 75.4 to 1667 ppb 6.4 to 3,090 ppb and from 0.1 to 46.4 ppm, respectively. Median values for As, B, Hg and NH3 were 2,151 ppb, 433 ppb, 123 ppb and 4.9 ppm, respectively. Highest values of As, B and NH3 were spatially well correlated and mainly identified at the summit and northern slope of Usu volcano as well as near by the site of the March, 2000 eruption. Soil mercury distribution did not show any spatial correlation with the main geological and hydrothermal features at the studied area. Distribution of soil As, B and NH3 anomalies at Usu were also spatially well correlated with high values of soil CO2 efflux (Hernández et al., 1998), suggesting a common origin for these discharges. These results indicate that deep perturbation of the Usu volcanic-hydrothermal system on the surface environment has been responsible for the observed spatial distribution pattern of soil volatiles.

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