Shallow seismicity beneath Ruapehu Crater Lake: results of a 1994 seismometer deployment |
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| Authors: | A W Hurst |
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| Institution: | Institute of Geological and Nuclear Sciences, P.O. Box 30-368, Lower Hutt 6315, New Zealand?,e-mail: T.Hurst@gns.cri.nz, NZ
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| Abstract: | Virtually all the seismicity within Ruapehu Volcano recorded during a 2-month deployment in early 1994, with 14 broadband
seismographs around the Tongariro National Park volcanoes in the North Island of New Zealand, was associated with the active
vent and occurred within approximately 1 km of Ruapehu Crater Lake. High-frequency volcano-tectonic earthquakes and low-frequency
events (similar to bursts of 2 Hz volcanic tremor) were both found to have sources in this region. The high-frequency events,
which often consisted of a smaller precursor event followed approximately 2 s later by the main event, had sharp onsets and
were locatable using standard techniques. The depth of these events ranged from the surface down to approximately 1500 m below
Crater Lake. The low-frequency events did not have sharp onsets and were located by phase-correlation methods. Nearly all
occurred under a small region on the east side of Crater Lake, at depths from 200 to 1000 m below the surface. This low-frequency
earthquake source region, in which no high-frequency events occurred, may be the steam zone within the actual vent of Ruapehu
Volcano.
Received: 30 June 1996 / Accepted: 16 February 1998 |
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| Keywords: | Ruapehu Volcanic seismology Volcanic tremor |
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