Magnitude 7.1 quake near North Island, New Zealand

Last updated: 2018-03-26 17:50:59 UTC

The Anza group at the University of California San Diego operates a broadband seismograph network consisting of 13 (+ 2) three component broadband seismograph stations centered near Anza Californa (see map).

On Monday, August 20, 2001 at 23:52:06 PDT we recorded a quake (preliminary Ms 7.1) located off the east coast of North Island, New Zealand. The Associated Press reports that the quake was felt over much of New Zealand's North Island and as far south as Marlborough on South Island. There have been no reports of injuries or major damage. View Washington Post article.

View the most recent map of local events near San Diego or a map of events recoded by ANZA from around the globe. We also have a bulletin of recent events recorded by the Anza network.

Initial source parameters for the recent event and aftershocks are shown below. The epicentral distance (distance separating the epicenter and the recording network) for Anza is ~91.94 degrees (10223 km).

This map shows the mainshock (red circle) and two aftershocks. Anza network stations are blue triangles, KNET network stations are pink triangles. Background seismicity is also plotted.



Origin time




-36.8720 -179.8620 8/21/2001 (233) 6:52:06.570 33.0 7.1* QED

*note that the location and magnitude determined for this event is preliminary and is subject to change upon further review of seismic data.

You may also view a plot showing

Of local interest:
We operate a broadband station on Mt. Soledad. At 00:05:08 PDT (Tuesday morning, the 21st) station SOL recorded the P wave from this event.

Here is a view of that event as picked by our analyst. The pink "P" indicates a P wave arrival, the "S" indicates an S wave arrival. The white phase labels indicate predicted arrival times based on a travel time model. One hour of data is displayed.

View a larger image showing the waveforms recorded at Mt. Soledad.

Learn more about the Anza group (including who works here, other networks, nuclear tests in India and Pakistan).

Learn more about the ANZA network (includes more station information, research, etc).

URL: [Last updated: 2018-03-26 17:50:59 UTC]