Quake Swarm Near Gisborne

A swarm of earthquakes, off-shore from Gisborne, has been making itself felt today.

Monday 6th April 2009

A swarm of undersea earthquakes off the coast near Gisborne has been making itself felt since 8:51 this morning. The swarm of nine quakes of magnitude 3 or 4 have been shallow events located about 40 km east of Gisborne (40 km south of Tolaga Bay).

The quakes follow a magnitude 4.1 quake in the area yesterday at 1:12 a.m. and a magnitude 3.0 event on Friday at 8:13 a.m.

Today’s nine quakes have ranged between magnitude 3.1 and 4.4, all at a depth of 25 to 30 km. Seven of the quakes were magnitude 3, including two events of magnitude 3.9 and one of magnitude 3.8, while two were magnitude 4.

The two biggest events of the series were a magnitude 4.2 quake at 8:51 this morning and a magnitude 4.4 event at 12:41. Shaking from these earthquakes was felt in Gisborne, the first event was also felt on the East Coast, with the later event felt in Hawke’s Bay.

Hawke’s Bay residents also felt a shallow magnitude 4.1 earthquake located 20 km north-east of Napier at 5:47 this morning.

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

Leave a Reply