Seismic Source Migration During Strombolian Eruptions Inferred by Very-Near-Field Broadband Seismic Network

Shunsuke Sugimura, Takeshi Nishimura, Giorgio Lacanna, Denis Legrand, Sébastien Valade, Maurizio Ripepe

Research output: Contribution to journalArticlepeer-review


We analyze seismic waves excited by small Strombolian explosions to understand the source process of volcanic explosions. We deployed five broadband seismometers at only 100–300 m away from the active craters of Stromboli volcano, Italy. Moment tensor inversion of the entire seismic signals in the 0.05–0.2 Hz band locates the source at a depth of 170 and 150–200 m west/southwest of the crater where acoustic waves are excited. Contrary, the sources of seismic waves in the 0.2–0.5 and 0.5–1.0 Hz bands are excited almost at the explosion onset and are located close to the crater. We show for the first time that explosions are preceded of about 10–20 s by a small amplitude seismic phase. Semblance analysis shows that this phase is radiated from a depth of 170 m beneath the western part of the crater area. Our analysis indicates that the source moves about 50 m toward the active crater 10–20 s before the explosion occurs at the surface. At the explosion onset, the source moves back to the same location of the small preceding phase. These lateral migrations of the seismic source are estimated by moment tensor inversion and semblance analysis. We suggest that migration reflects the bending of the shallow feeding system toward northeast. Seismic waves are thus reflecting the history pressure generated by the rising of a gas-rich pocket in the very shallow portion of a magma mush and by the following restoring force occurring after the explosion.

Original languageEnglish
Article numbere2021JB022623
JournalJournal of Geophysical Research: Solid Earth
Issue number12
Publication statusPublished - 2021 Dec


  • Strombolian eruptions
  • moment tensor inversion
  • seismic source migration
  • semblance analysis
  • very-near-field observation

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


Dive into the research topics of 'Seismic Source Migration During Strombolian Eruptions Inferred by Very-Near-Field Broadband Seismic Network'. Together they form a unique fingerprint.

Cite this