M5.2 Earthquake 36 km SW of Blenheim, New Zealand — February 21, 2022
2022-02-21 03:06:45 UTC (2022-02-21) · approx. 3:06 PM UTC+12 local
Felt by 42 people across nearby locations. Maximum shaking intensity MMI 4.7 (moderate).
On February 21, 2022 at 03:06 UTC, a magnitude 5.2 shallow crustal earthquake struck 36 km SW of Blenheim, New Zealand, at a depth of 36.4 km and coordinates -41.7520°, 173.6512°. The earthquake was reported felt by 42 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.7 (moderate). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. The nearest populated place is Blenheim (population 26,550).
Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in New Zealand, a region characterized by the Hikurangi subduction zone in the North Island and the Alpine Fault in the South Island. The nearest mapped fault system is the Alpine Fault. View all earthquakes in New Zealand.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 42 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 727,892 |
| MMI 4 | light | 48,145 |
| MMI 5 | moderate | 557 |
Earthquake Details
173.6512°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.2 earthquake near Blenheim, New Zealand?
The magnitude 5.2 earthquake that struck 36 km SW of Blenheim, New Zealand on February 21, 2022 at 03:06 UTC had a depth of 36.4 km. It was felt by 42 people with maximum shaking intensity of MMI 4.7 (moderate). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -41.7520°, 173.6512°, which is 36 km SW of Blenheim, New Zealand. The nearest populated place is Blenheim (population 26,550). View all earthquakes in New Zealand.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.2 earthquakes can continue for days to weeks and gradually diminish over time.
Has New Zealand had earthquakes this big before?
The largest recorded earthquake in New Zealand was the M8.2 Wairarapa earthquake of January 23, 1855. Today's magnitude 5.2 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000gmji). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, February 21, 2022). M5.2 Earthquake 36 km SW of Blenheim, New Zealand — February 21, 2022. Retrieved May 4, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000gmji/