Broadband seismic observations at Satsuma-Iwojima volcano, Japan

Details Broadband seismic observations at Satsuma-Iwojima volcano, Japan Broadband seismic observations at Satsuma-Iwojima volcano, Japan

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2845o&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 22, p. 2845-2848

Physics

17

Volcanology: Magma Migration

Scientific paper

This paper reports the results of preliminary analysis of broadband seismic observations conducted at Satsuma-Iwojima volcano, Japan. The recorded broadband data show a wide variety of seismic features. Small (M~0), short-period volcanic earthquakes characterized by a long (~5s) emergent phase and by nearly identical waveforms are located at the very shallow part of the summit crater. Long-period seismic pulses synchronized with a regular amplitude modulation of volcanic tremor have an interval of approximately 46 to 50 min. Each of the long-period pulses has almost identical waveform. Polarization of the long-period events suggests a very shallow source which can be interpreted as a result of a volume expansion mechanism. The correlation between the long-period seismic pulses and volcanic tremor seems to be associated with magma convection and the degassing process inside the conduit of the volcano.

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