1. Breislak was a pioneer in the collection and analysis of volcanic gas . 2. These characteristics make sulphur dioxide a good target for volcanic gas monitoring. 3. Volcanic gas monitoring is a standard tool of any volcano observatory.4. There are also small amounts in mineral springs, volcanic gas , and meteoric iron. 5. Until then, scientists had not detected significant amounts of volcanic gases . 6. Advances also have come in the third set, volcanic gases . 7. Crews Thursday made flyovers of the crater, trying to detect any volcanic gas releases. 8. As the molten rock crawls upward, they say, volcanic gases continue to be released. 9. Likewise, a recent flyover of the mountain showed higher readings of volcanic gas levels. 10. With Oyama still belching volcanic gas , officials say it is too dangerous to go back.
