Charles R. Wilson, John V. Olson and Daniel L

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Presentation transcript:

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

Erebus seismic tremor infrasound 9/17/02 Trace Velocity 0.339 Km/sec Azimuth 339 deg. Maximum peak- To-peak Amp 0.02 Pascal

Abs(fft) tremor infrasound 05:05 to 05:05:30, 260 0.86 sec

Erebus Tremor Infrasound 9/17/02, 05:05:30-05:06:00 UT Velocity 0.308 km/sec Azimuth 341 deg.

Abs(fft) tremor infrasound 12:25 to 12:26 UT day 260 0.89 sec

abs(fft) Erebus infrasound 13:05 to 13:06, day 260 1.08 sec

MCCM detector plot Erebus infrasound Sept 17,2002 12:00 to 13:00 UT Trace Velocity 340 deg. Azimuth

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

Uncertainty in velocity and azimuth for tremor infrasound day 260, 04:01 to 04:10 Velocity = 307 m/sec +/- 1.35 m/sec Azimuth = 340 +/- 0.25 deg

Scatter diagrams for velocity, slowness and wavenumber space for tremor inf. Day 260

MCCM Detector plot, I55US, 9/17/02 filtered data (0 MCCM Detector plot, I55US, 9/17/02 filtered data (0.7 to 10 Hz) inner sensors only MCCM Velocity 340 deg. Azimuth

Azimuth of Arrival for 24 hours 9/17/02 I53US 340 deg.

Trace Velocity I53US 09/17/02 0.350 km/s 0.30 km/s

MCCM detector plot, I55US 8/24/02, filtered (0.7 to 10 Hz) 340 deg.

MCCM plot I55US 6/03/03 filtered (0.70 to 10 Hz) 340 deg.

Tremor signal detector plot day 260 04:00 to 05:00 UT

Tremor signal detector plot day 260 05:00 to 06:00 UT

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 Phase-aligned overlay of 8 sensor traces

Erebus Crater with lava lake eruption

Strombolian type Erebus signal 8/13/2002 Seconds

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.