Tawa Earthquakes

A pair of earthquakes struck near Wellington’s northern suburb of Tawa overnight.

Saturday 2nd May 2009

What appears to be a mainshock and aftershock pair of earthquakes struck just south of Tawa overnight.

The larger event of the pair struck at 5:16 p.m. on Friday May 1st, at a location 10 km south of Porirua, 10 km west of Lower Hutt, at a depth of 30 km. The epicentre for the magnitude 4.1 quake is about half-way between the southern part of Tawa, known as Redwood, and Glenside, where the Main Trunk railway line enters the first of two tunnels en route to Wellington.

What appears to be an aftershock struck the same location at 1:12 this morning, also at a depth of 30 km. The second event, at magnitude 3.1, was less widely felt, attracting 7 reports from the public, including one fanciful report from Dunedin.

The main event attracted 758 felt reports from the public, being felt from Waikanae to Lyall Bay, to the east at Martinborough, and at Picton in the South Island. Twenty reports of strong shaking were filed from Pauatahanui to Newtown and Eastbourne to Stokes Valley.

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

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