Marlborough Earthquakes Continue

The series of moderate earthquakes occurring near Hanmer Springs and St Arnaud continued with two more events late last night.

Tuesday, 15th March 2016

Two earthquakes struck near Hanmer Springs late last night. At 11:28 p.m. a magnitude 5.0 earthquake struck 30 km north-east of Hanmer Springs at a depth of 10 km. The quake was felt from Wanganui to Queenstown.

A magnitude 4.6 aftershock struck the same area eight minutes later, being slightly deeper at 27 km. This quake was felt from Wellington to Canterbury.

GeoNet's national seismograph network March 14 2016

GeoNet’s national seismograph network March 14 2016

[click for larger image] This snapshot of GeoNet’s national seismograph network shows the traces left by the mainshock and first aftershock. The earthquake shown on the left of the plot is the magnitude 3.8 quake that struck 3 km west of Elsdon, 15 km north of Wellington, at 8:42 p.m.

A typical aftershock sequence has followed with a magnitude 3.3 event at 1:21 this morning, a magnitude 3.4 event at 2:12 a.m., a magnitude 3.2 event at 3:28 and a magnitude 3.4 quake at 6:38 this morning.

A magnitude 5.7 earthquake struck the area on February 9th. Details of earthquakes which have struck the area in the past year can be found here.

Other earthquake activity in Marlborough in recent weeks includes the magnitude 5.0 quake which struck 30 km south-east of Seddon (near Cape Campbell) at 4:10 p.m. on February 22nd. This quake was 8 km deep.

[Compiled from data provided by GeoNet]

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