WELLINGTON, New Zealand -- A minor earthquake has scientists continuing to closely monitor a New Zealand volcano that erupted for the first time in more than a century this week.

The steam-triggered eruption Monday of Mount Tongariro on New Zealand's North Island sent boulders flying, covered surrounding areas in ash and disrupted domestic flights.

Scientists flew over the area for the first time Wednesday. Volcanologist Steve Sherburn says it appears the eruption blew three new holes in the north side of the mountain, including one about the size of a house. He says it's not yet clear what to expect next from the volcano, which continues to vent steam.

He says the overnight quake, which had a magnitude of less than 3, continues a recent series of temblors in the area.

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  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A rugby ball is covered in ash after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. Mt Tongariro erupted intermittently from 1855 to 1897. Although not an immediate threat to the community, the latest eruption may be the beginning of weeks, months or even years of volcanic activity. (Photo by Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A sheep is covered in ash after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A pair of glasses are covered in ash after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Road signs are coated in ash on state highway one after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Dr Jon Procter from Massey University holds an ash sample after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A motorist is surrounded by a cloud of ash on state highway one after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A sign marks the start of the Desert Road which was closed for several hours after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A car kicks up a cloud of ash on state highway one after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A general view of Mt Ruapehu from Waiouru after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A sign is displayed at a road block on the Tongariro Alpine Crossing entry road after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Dr Jon Procter from Massey University collects an ash sample after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A warning sign is displayed at a road block on the Tongariro Alpine Crossing entry road after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Road signs and the surrounding area are coated in ash on state highway one after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: A car kicks up a cloud of ash on state highway one after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Plants and rocks are covered in ash after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Josh Martin, 14, and mother Karen Martin pose while cleaning up a friends' property after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Horses enjoy some fresh hay while the rest of thier paddock is blanketed in ash after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Karen Martin shows off the ash stuch to her gumboots after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Karen Martin helps clean up ash at a friends' property after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)

  • Mt Tongariro Erupts

    TONGARIRO NATIONAL PARK, NEW ZEALAND - AUGUST 07: Local resident Dale Martin helps clean up ash at a friends' property after Mt Tongariro erupted for the first time in over 100 years on August 7, 2012 in Tongariro National Park, New Zealand. (Hagen Hopkins/Getty Images)