Two Earthquakes Strike New Zealand’s North Island Within Hours

Key facts

• Magnitude 4.0 earthquake struck 10 km northwest of Porirua at 3:15 a.m. on Sunday, depth 22 km.
• Over 2,000 'felt it' reports were submitted to GeoNet for the Porirua quake.
• A magnitude 5.2 earthquake hit 25 km west of Te Araroa, East Cape, at 9:19 a.m., depth 32 km.
• for the East Cape quake; 484 rated as 'weak', 250 as 'light', 56 as 'moderate'.
• One person rated the East Cape shaking as 'extreme', three as 'strong'.
• Both epicentres were offshore: near Mana Island for the first, and off the East Cape for the second.

Early Morning Jolt in Wellington

Residents across the Wellington region were jolted awake at 3:15 a.m. on Sunday by a magnitude 4.0 earthquake centered 10 kilometers northwest of Porirua. The quake, which struck at a depth of 22 kilometers, had its epicenter in the sea near Mana Island. More than 2,000 people submitted 'felt it' reports to GeoNet, the government seismology website, with the vast majority coming from the also came from the top of the South Island, indicating the tremor's reach.

Second, Stronger Quake Hits East Cape

Just over six hours later, at 9:19 a.m., a magnitude 5.2 earthquake struck 25 kilometers west of Te Araroa on the East Cape, at a depth of 32 kilometers. GeoNet described the shaking as 'moderate'. feeling the quake, with the majority—484—rating it as 'weak'. However, 250 described it as 'light', 56 as 'moderate', three as 'strong', and one person reported 'extreme' shaking. The epicenter was offshore, reducing the potential for damage on land.

Public Response and Seismic Monitoring

GeoNet, New Zealand’s official seismic monitoring network, collected thousands of public reports across both events, underscoring the country’s high level of earthquake awareness. to supplement instrumental data and assess shaking intensity. The two quakes occurred on the same day, but there is no immediate indication that they are directly related, as they originated in different tectonic settings. The first was near the subduction zone off the southwest of the North Island, while the second was along the Hikurangi subduction margin off the East Coast.

Regional Impact and Preparedness

While no significant damage or injuries have been reported from either earthquake, the events serve as a reminder of New Zealand’s seismic vulnerability. The country sits on the Pacific Ring of Fire and experiences thousands of earthquakes each year, most of them minor. Local authorities in Wellington and Gisborne have not issued any special advisories, but residents are encouraged to review their emergency plans. The quakes come amid ongoing research into earthquake dynamics, including recent studies on 'stopping phases' that examine how ground motion ceases suddenly.

Broader Seismic Context

New Zealand has experienced several notable earthquakes in recent months, including a magnitude 7.4 event in Indonesia on April 2 that triggered a tsunami alert, and a separate magnitude 5.0 quake in the Kermadec region. While these events are unrelated, they highlight the persistent tectonic activity across the Pacific. The two Sunday quakes are likely to be followed by aftershocks, though none have been reported as of Sunday afternoon. GeoNet continues to monitor the situation closely.

The bottom line

• Two earthquakes struck New Zealand’s North Island on Sunday: a magnitude 4.0 near Porirua and a magnitude 5.2 off the East Cape.
• Over 2,000 people reported feeling the first quake; nearly 800 reported the second.
• from either event.
• Both epicenters were offshore, reducing potential impact on populated areas.
• New Zealand’s GeoNet system logged thousands of public reports, demonstrating widespread public engagement with seismic monitoring.
• The quakes are a reminder of the country’s high seismic risk and the importance of preparedness.