Broadband seismic observations at Satsuma‐Iwojima Volcano, Japan

Publisher Website
Google Scholar
Abstract
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 (∼5 s) 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.