[S-VC29] Monitoring and assessment of volcanic activities

[SVC29-P06] Waveform characteristics of volcanic earthquakes when volcanic activity increases

*KOJI KATO¹, Akira Sugai², Masamichi Nakamura² (1.Meteorological College, 2.Japan Meteorological Agency)

Keywords:Volcanic earthquake, Monitoring of volcanic actvities

Minakami (1960) showed that waveform classification is the effective for volcanic activity prediction at Mt. Asama. Referring to that, Japan Meteorological Agency (hereafter JMA) has classified the waveforms at each volcano since around 1970s. Although Minakami (1960) classified only four types of volcanic earthquakes: type A, type B, explosive earthquake, and volcanic tremor, JMA later developed its own various classification at each volcanoes. Takeo (1986) reviews volcanic earthquakes from the perspective of a model of their mechanism. This is important for monitoring and evaluation of volcanic activities. It is necessary to understand what types of earthquakes can occur during the process of volcanic activity and monitor volcanic activities (Nishimura and Iguchi, 2006).
However, the relationship between event types and volcanic activity is not well understood, except for some active volcanoes such as Mt. Asama. Additionally, waveform classification is often unique to each volcano, and there are few cases in which comparisons have been made between different volcanoes. When applying knowledge of event types and volcanic activity to volcanoes with little knowledge, it is important to understand the characteristics of the waveforms observed at each volcano. In this presentation, we will report on our investigation into the characteristics of waveforms observed at several volcanoes when volcanic activity increases.