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Volcanic earthquakes beneath Mt Tongariro decline in size

Fuseworks Media
Fuseworks Media

The volcanic earthquakes continue beneath Mount Tongariro, but have declined in size and number. No other changes have been observed.

The sequence of volcanic earthquakes recorded at Mount Tongariro since July 13 has continued, but now there are fewer than 5 events each day and most are smaller than those in July (see graph below). Activity is currently at a lower level than in previous weeks, but may increase again at any time. The earthquake locations cluster in a zone beneath northern Tongariro (Emerald Lakes - Te M?ri craters) at 2 km-7km depth.

No other changes have been observed. Initial analysis of the July gas samples confirmed that there had been a marked increase in the volcanic gas component of fumarole discharges at Tongariro. Full analysis of these samples continues.

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