Geophysics
Active and Passive Imaging (Tomo Erebus Project)

Active and Passive Source Imaging

During late 2007 through early of 2009, the MEVO group performed a large active (recording explosions) and passive (recording eruptions, seismic background noise, and other signals) experment, Tomo Erebus.

During the 2007-2008 field season, 23 intermediate-period seismometers were installed to collect date through the austral fall and winter, for the passive-source aspect of the experiment. One year later, 100 three-component short period stations were deployed to record 16 chemical blasts.

Instrumentation for this experiment and field support was provide by the IRIS PASSCAL Instrument Center at NM Tech. These data are expected to provide dramatic new insight into the internal structure of the volcano.

 

Rendering of Ross Island (left) and the summit region of Mount Erebus (right) showing sparse intermetiate period stations and shot locations of the Tomo Erebus project.

Summit rendering of Erebus Volcano showing dense summit short-period station deployment and shot locations (red). After Zandomeneghi et al., 2009.

References

Zandomeneghi, D., Kyle, P., Miller, P., Snelson, C., Aster, R., Seismic tomography of Erebus Volcano, Antarctica, EOS trans AGU, in press, 2009.

Maraj, S., Snelson, C., Kyle, Pl, Zandomeneghi, S., Knox, H., Aster, R., Miller, P., Kaip, G., Controlled- source seismic investigations of the crustal structure beneath Erebus volcano and Ross Island, Antarctica, Eos Trans. AGU, Fall Meet. Suppl., 2009.

Chaput, J., Knox, H., Aster, R., Kyle, P., Green’s function estimates from body-wave autocorrelations of Strombolian eruption coda at Erebus volcano: Evidence for temporally varying shallow magmatic structure, Eos Trans. AGU, Fall Meet. Suppl., 2009.

 
Upward Gliding
Upward Gliding Tremor

Seismogram and spectrogram of an Upward Gliding Tremor recorded on February 9, 2001 on the component of the E1S broadband station. This tremor episode shows a transitional spectral pattern from a chaotic portion to a more self-organized harmonic part. A slight down-ward gliding followed by a sharp-exponential upward gliding appears on the seismogram.This audio record is sped up by a factor of 100 relative to the actual seismic signal.

 
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