Year: 1972
Type: article
Abstract: Volcano Akita-Komaga-take went into sudden eruptions on September 17, 1970 after 38 years' silent period and the Strombolian type eruptions were continued until January 25, 1971.The geothermal survey was conducted immediately before the outburst and also the seismic observation was carried out throughout the period of the volcanic eruptions.The only one forerunning phenomenon of the eruptions was the appearance of a high ground temperature area with many fumaroles.About 33,000 explosion earthquakes were observed from September 18, 1970 to January 25, 1971.However, volcanic tremor was observed only on the late stage of activity and no B-type earthquake was recorded.The relationship between frequency and maximum amplitude for the explosion earthquakes was consisted of two parts and the m value in the part of smaller amplitude was 2.7-2.9, while that for larger amplitude was 4.4.
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W430666378