M 3.3 - OFF W. COAST OF N. ISLAND, New Zealand
A magnitude 3.3 earthquake struck near OFF W. COAST OF N. ISLAND, New Zealand on Saturday, September 5, 2026. This minor seismic event occurred at a focal depth of 7.4 km (shallow crustal event), verified by GNS real-time seismic telemetry.
Seismic Telemetry Specifications
3.3ML
Minor Seismic Class
7.4km
Crustal Layer
39.291° S, 173.895° E
GPS Coordinates
1 tons
TNT Equivalent Power
GNS
USGS Real-time Feed
Epicenter Location & Tectonic Fault Map
Is This Earthquake Dangerous?
A magnitude 3.3 event is classified as a minor earthquake. Often felt by people indoors, especially on upper floors. Hanging objects may swing slightly; structural damage is extremely rare.
Estimated Shaking Radius
~25–50 km
Potential Damage Zone
None
Focal Depth Effect
High Surface Energy
What Does Magnitude 3.3 Mean?
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Logarithmic Energy Multiplier
Because seismic scales are logarithmic, each whole integer increase represents:
10× Ground Motion Amplitude
The seismograph wave amplitude jumps by tenfold for every 1.0 magnitude step.
~31.6× Radiated Kinetic Energy
Total energy release increases exponentially (101.5 ≈ 31.62 times per magnitude unit).
Why Did This Earthquake Happen?
New Zealand straddles the boundary between the Australian and Pacific tectonic plates. In the South Island, the Alpine Fault accommodates oblique strike-slip motion, while the Hikurangi Subduction Zone off the North Island generates subduction earthquakes along the southwestern edge of the Ring of Fire.
Originating at a depth of 7.4 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.
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Earthquake Safety Action Plan
- •Drop, Cover, and Hold On: Take cover beneath a sturdy table or desk.
- •Stay indoors away from exterior glass windows and heavy unanchored fixtures.
- •If outdoors, move into an open area away from power lines and building facades.
- •Inspect utilities for damaged gas lines, water leaks, or electrical hazards.
- •Expect Aftershocks: Secondary tremors frequently strike after moderate and strong events.
- •Avoid damaged structures and listen to official emergency broadcasts.
- •Maintain a 72-hour emergency go-bag with water, non-perishable food, and first aid.
- •Anchor heavy furniture, water heaters, and appliances to structural wall studs.
- •Establish a family emergency communication protocol and meeting point.
Did You Feel This Earthquake?
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