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Moderate magnitude 4.1 earthquake at 33 km depth
18 Aug 00:12 UTC: First to report: GEONET (NZ) after 6 minutes.
18 Aug 00:13: Magnitude recalculated from 1.6 to 2.0.
18 Aug 00:18: Magnitude recalculated from 2.0 to 4.1. Hypocenter depth recalculated from 5.20 to 33.00 km (from 3.2 to 21 mi). Epicenter location corrected by 1279 km (795 mi) towards NNE.
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Earthquake details Date & timeAug 18, 2025 00:05:51 UTC – Local time at epicenterMonday, Aug 18, 2025, at 12:05 pm (GMT +12) Statuspreliminary (automatic detection) Magnitude4.1 Depth33 km Epicenter latitude / longitude30.2684°S / 177.2439°W Manawatu-Wanganui, New Zealand Seismic antipode30.2684°N / 2.7561°E Spain Shaking intensityIII Weak shaking near epicenter Felt0 reports Primary data sourceGEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand) Nearest volcanoMacauley (118 km / 73 mi) Weather at epicenter at time of quakeScattered Clouds 14.2°C (57 F), humidity: 65%, wind: 6 m/s (12 kts) from WNW Estimated seismic energy released8.9 x 1010 joules (24.8 megawatt hours, equivalent to 21.3 tons of TNT) | equivalent to ONE quake of magnitude 4.1 | about seismic energy
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