Earthquake Swarm in Southern Alps

A swarm of seven earthquakes struck in the Southern Alps north-west of Mt Cook yesterday. Six of the quakes were at very shallow depths in an area about 30 km north-west of Mt Cook, with a much deeper event occurring near Fox Glacier.

The first event was a magnitude 2.7 quake at a depth of 5 km at 7:42 on Monday morning. This was followed at 7:34 p.m. by the deep (110 km) magnitude 3.7 quake near Fox Glacier.

At 8:49 p.m. a magnitude 4.3 earthquake occurred, followed by a magnitude 3.1 at 9:16, a magnitude 3.3 at 9:43 p.m., a magnitude 4.6 at 10:02 p.m. and a magnitude 4.4 quake at 11:29 p.m.

All of the shallow quakes were at depths less than 10km and could have been felt locally, while the three 4th magnitude events may have been felt at more distant locations in the central South Island.

[Compiled from data provided by the Geonet project and its sponsors EQC, GNS Science and FRST.]

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