5:15 PM - 6:45 PM
[SVC29-P07] Monitoring of sulfur dioxide and hydrogen sulfide in volcanic plume of remote volcnaic island of Satsuma-Iwojima, Japan.
Keywords:volcanic gas, remote volcanic island , Satsuma Iwojima, SO2/H2S ratio
The composition of sulfur dioxide and hydrogen sulfide in volcanic plumes is a useful indicator for evaluating volcanic activity, especially in elucidating the influence of hydrothermal activity in volcanic systems. This composition, along with the sulfur dioxide flux, can also provide the total sulfur emissions from the volcano. The sulfur dioxide flux of Satsuma-Iwojima volcano, a remote island located in the southwestern part of Japan, has been monitored using the ferry traverse method with an automated UV spectrometer system (Mori et al., 2017). The observed data has been highly beneficial for evaluating the activity of Satsuma-Iwojima volcano. Although information on the sulfur dioxide flux of the volcano has been accumulated over the past four years, there is limited data available on the composition of volcanic gases due to the remote location of the island.
In this study, an SO2 and H2S chemical sensor system was developed to monitor the SO2/H2S ratio of the volcanic plume and installed on the ferry traveling to Satsuma-Iwojima Island from Kagoshima. The system utilizes sulfur dioxide and hydrogen sulfide electrochemical sensors (KTS-512P & KHS-5TA, Komyo Rikagaku Kogyo) along with a PCB for the sensors (SM2-1, Komyo Rikagaku Kogyo). Voltage outputs of the sensors are AD converted with 16-bit resolution and recorded with a microprocessor (M5capsule, M5stack Technology). The system monitors outside air during the voyage to detect volcanic plume wafting near to the sea surface.
The system has been operational since the beginning of February 2024, and preliminary results show an SO2/H2S ratio of 5-10. This range falls within the ratio range (5-14) of high-temperature volcanic gases (> 500°C) near the summit area of the volcano reported by the GSJ group (Shinohara et al., 1993). The development of the sensor system, validation of the monitoring, and temporal variation of the SO2/H2S ratio of the volcano will be discussed in the presentation.
In this study, an SO2 and H2S chemical sensor system was developed to monitor the SO2/H2S ratio of the volcanic plume and installed on the ferry traveling to Satsuma-Iwojima Island from Kagoshima. The system utilizes sulfur dioxide and hydrogen sulfide electrochemical sensors (KTS-512P & KHS-5TA, Komyo Rikagaku Kogyo) along with a PCB for the sensors (SM2-1, Komyo Rikagaku Kogyo). Voltage outputs of the sensors are AD converted with 16-bit resolution and recorded with a microprocessor (M5capsule, M5stack Technology). The system monitors outside air during the voyage to detect volcanic plume wafting near to the sea surface.
The system has been operational since the beginning of February 2024, and preliminary results show an SO2/H2S ratio of 5-10. This range falls within the ratio range (5-14) of high-temperature volcanic gases (> 500°C) near the summit area of the volcano reported by the GSJ group (Shinohara et al., 1993). The development of the sensor system, validation of the monitoring, and temporal variation of the SO2/H2S ratio of the volcano will be discussed in the presentation.