Activity Moves South

After this morning’s earthquake swarm near Wanganui activity has, apparently, moved south.

In all, five earthquakes between magnitude 3.8 and 4.5 occurred 30 km south-west of Wanganui between fifty-five minutes after midnight and ten past eight this morning according to Geonet. At this stage it is too early to determine whether the swarm has run its course. The last event, a magnitude 4.2 earthquake at 8:10 a.m. indicates that activity is not waning.

Activity has moved to an area near the other end of the Alpine Fault, with a magnitude 4.6 earthquake, 90 km deep occurring 40 km west of Te Anau at 10:58 a.m.

Similar patterns of earthquakes were observed during Wanganui’s earthquake swarms last year.

During the swarm which ran from May 20th to July 4th, a magnitude 5.3 earthquake 33 km deep occurred 140 km west of Te Anau on June 30th. A magnitude 4.7 quake 120 km deep occurred 50 km north-west of Te Anau on August 4th, during the Wanganui swarm which ran from July 20th to August 5th. During the Wanganui swarm which ran between November 4th and 10th, a magnitude 5.3 quake 33 km deep occurred 180 km north-west of the Auckland Islands on November 7th.

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