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Moderate mag. 4.7 earthquake - 14 km northeast of Masinloc, Province of Zambales, Central Luzon, Philippines, on Friday, Mar 17, 2023 at 12:21 am (GMT +8) -

Moderate magnitude 4.7 earthquake at 27 km depth

16 Mar 16:40 UTC: First to report: PHIVOLCS after 20 minutes.
16 Mar 21:00: Hypocenter depth recalculated from 24.0 to 23.0 km (from 14.9 to 14.3 mi). Epicenter location corrected by 4.4 km (2.8 mi) towards ESE.
17 Mar 11:40: Hypocenter depth recalculated from 23.0 to 27.0 km (from 14.3 to 16.8 mi). Epicenter location corrected by 4.8 km (3 mi) towards WNW.

Earthquake details

Date & time	Mar 16, 2023 16:21:00 UTC -
Local time at epicenter	Friday, Mar 17, 2023 at 12:21 am (GMT +8)
Status	Confirmed
Magnitude	4.7
Depth	27.0 km
Epicenter latitude / longitude	15.61°N / 120.06°E (Province of Zambales, Central Luzon, Philippines)
Antipode	15.61°S / 59.94°W
Shaking intensity	Weak shaking
Felt	1 report
Primary data source	PHIVOLCS (Philippine Institute of Volcanology and Seismology)
Nearest volcano	Pinatubo (62 km / 39 mi)
Nearby towns and cities	13 km (8 mi) ENE of Taltal (Zambales, Luzón Central) (pop: 5,370) \| Show on map \| Quakes nearby 14 km (9 mi) NE of Masinloc (Zambales) (pop: 28,000) \| Show on map \| Quakes nearby 24 km (15 mi) SE of Santa Cruz (pop: 26,400) \| Show on map \| Quakes nearby 33 km (20 mi) NNE of Iba (Zambales) (pop: 26,900) \| Show on map \| Quakes nearby 39 km (24 mi) WSW of Camiling (pop: 39,700) \| Show on map \| Quakes nearby 76 km (47 mi) NW of Angeles City (pop: 299,400) \| Show on map \| Quakes nearby 93 km (58 mi) NW of San Fernando City (pop: 251,200) \| Show on map \| Quakes nearby 149 km (93 mi) NW of Manila (National Capital Region) (pop: 1,600,000) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Broken Clouds 21.9°C (71 F), humidity: 79%, wind: 2 m/s (3 kts) from ESE
Estimated seismic energy released	7.1 x 10¹¹ joules (197 megawatt hours, equivalent to 169 tons of TNT) \| about seismic energy

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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag.	Depth	Location	Source
4.7	27 km	Philippines: 016 Km N 68° E of Masinloc (Zambales)	PHIVOLCS

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Seismograms

Seismic station: Taitung (TWGB/TW network) | Distance from quake: 809 km / 502 mi | Show on map | Station Info

Seismic station Taitung: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Translate

Batac, Ilocos Norte / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Mild shaking

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