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Tongariro volcano (New Zealand): small earthquakes

Tue, 6 Aug 2013, 07:27
07:27 AM | BY: T
Current seismic recording from Tongariro (GeoNet)
Current seismic recording from Tongariro (GeoNet)
During the past two weeks, GeoNet has been recording very small earthquakes beneath the volcano. The quakes were too small to be located but show up on local seismic stations.
GNS Science said the earthquakes could simply be part of the background unrest typical of most active volcanoes. However, in this case they are of interest at this time because there have been so few at Tongariro since November 2012 and potentially could signal changes occurring inside the volcano.
The amounts of carbon dioxide and sulfur gases emitted from Tongariro have remained at low levels since the start of this year and are about half the amount produced after the November 2012 explosion. These conditions, and the small number and small size of recent earthquakes are not sufficient to alter the unrest status of the volcano and GNS Science has not changed the Volcanic Alert Level from 1, or the Aviation Colour Code from Green.
Te Māri has had no eruptive activity since an explosion on 21 November 2012 although an eruption could still occur with little or no warning.

Previous news

Wed, 27 Mar 2013, 06:00

Tongariro volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 March-2 April 2013 (Continuing Activity)

On 25 March GeoNet reported that Tongariro remained quiet with no eruptive activity being detected since the explosion on 21 November 2012. Steam-and-gas plumes rose from the Te Maari Craters. The Aviation Colour Code was lowered to Green (second lowest on a 4 four-color scale) and the Volcanic Alert Level remained at 1 (on a scale of 0-5). ... Read all
Tue, 19 Feb 2013, 17:05

Tongariro volcano (North Island, New Zealand) activity update

Current seismic signal at Tongariro (WT station, GeoNet)
An increased number of earthquakes and possibly a weak tremor pulses appear on today's seismic recording. ... Read all
Show more
Tongariro volcano
complex volcano 1978 m / 6,490 ft
North Island, New Zealand, -39.12°S / 175.65°E
Current status: normal or dormant (1 out of 5) Tongariro volcano eruptions:
Eruptions outside Ngauruhoe, mainly on SSE flank (Red Crater): 6 Aug 2012, 1927 (?), 1926, 1896, 1890 (?), 1886, 1885±1, 1869, 1859, 1855, 1500 ± 50, 550 BC ± 200 years, 9350 BC (?), 9450 BC (?), 9650 BC (?), 9850 BC (?)
Eruptions from Ngauruhoe vent: 1975-77, 1972, 1968-69, 1962, 1958-59, 1956, 1948-54, 1939-40, 1937, 1934, 1931, 1924-28, 1917, 1913-14, 1909-10, 1904-07, 1897-98, 1892, 1883, 1881, 1878, 1875, 1869-70, 1862-64, 1857, 1844, 1841, 1839, 550 BC ± 200
Typical eruption style
explosive
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