erebus putative seismic tremor infrasound observed at i55us on day 260 2002 sep 17
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Erebus Putative Seismic-Tremor Infrasound observed at I55US on day 260, 2002, Sep.17. Charles R. Wilson, John V. Olson and Daniel L. Osborne, Geophysical Institute, University of Alaska at Fairbanks, Alaska October 17, 2003. Eight sensor array at I55US with Erebus volcano.

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erebus putative seismic tremor infrasound observed at i55us on day 260 2002 sep 17

Erebus Putative Seismic-Tremor Infrasound observed at I55US on day 260, 2002, Sep.17

Charles R. Wilson, John V. Olson and Daniel L. Osborne, Geophysical Institute, University of Alaska at Fairbanks, Alaska

October 17, 2003

erebus seismic tremor infrasound 9 17 02
Erebus seismic tremor infrasound 9/17/02

Trace Velocity

0.339 Km/sec

Azimuth

339 deg.

Maximum peak-

To-peak Amp

0.02 Pascal

erebus tremor infrasound 9 17 02 05 05 30 05 06 00 ut
Erebus Tremor Infrasound 9/17/02,05:05:30-05:06:00 UT

Velocity

0.308 km/sec

Azimuth

341 deg.

mccm detector plot erebus infrasound sept 17 2002 12 00 to 13 00 ut
MCCM detector plot Erebus infrasound Sept 17,2002 12:00 to 13:00 UT

MCCM

Trace Velocity

340 deg.

Azimuth

mccm detector plot for random noise on all eight sensors at i55us
MCCM detector plot for random noise on all eight sensors at I55US

Random Noise

Sensor Number 1

MCCM value; 0 to 1

Trace Velocity

Azimuth of arrival

One hour of time

phase aligned overlay inner three sensors of tremor infrasound day 260 04 01 to 04 10 ut
Phase-aligned overlay inner three sensors of tremor infrasound day 260, 04:01 to 04:10 UT
uncertainty in velocity and azimuth for tremor infrasound day 260 04 01 to 04 10
Uncertainty in velocity and azimuth fortremor infrasound day 260, 04:01 to 04:10

Velocity = 307 m/sec +/- 1.35 m/sec

Azimuth = 340 +/- 0.25 deg

mccm detector plot i55us 9 17 02 filtered data 0 7 to 10 hz inner sensors only
MCCM Detector plot, I55US, 9/17/02 filtered data (0.7 to 10 Hz) inner sensors only

MCCM

Velocity

340 deg.

Azimuth

co ntinuous type erebus tremor signals
Continuous-Type Erebus “tremor” signals
  • During the year 2002 four episodes have been found in the I55US data set of very low amplitude, continuous-type infrasound from an average azimuth of 340 +/- 0.78 deg, with an average trace velocity of 329.50 +/- 3.0 m/sec
  • The average amplitude of these signals is 0.01 Pa, with a duration up to 5 hours
impulsive signals from strombolian type eruptions from the lava lake in the erebus crater
Impulsive Signals from Strombolian-type eruptions from the lava lake in the Erebus Crater

Phase-aligned overlay of 8 sensor traces

statistics of impulsive signals
Statistics of impulsive signals
  • 182 Erebus signals received at I55US
  • Period April 2002 to March 2003
  • Average trace vel = 320.5 +/- 6.32 m/sec
  • Average Azimuth = 336.5 +/- 0.39 deg
  • The impulsive signals were filtered in the passband 0.70 to 10 Hz to eliminate the microbarom background
  • Impulsive signals are coherent over the entire 8 sensor array of aperture 1.9 km.
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