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Weak mag. 2.1 earthquake - 15 km northwest of Angra do Heroismo, Azores, Portugal, on Saturday, Mar 18, 2023 at 8:18 am (GMT -1) -

Weak magnitude 2.1 earthquake at 1 km depth

18 Mar 09:36 UTC: First to report: IPMA after 17 minutes.
18 Mar 14:09: Magnitude recalculated from 2.4 to 2.1. Hypocenter depth recalculated from 0.0 to 1.0 km (from 0 to 0.6 mi). Epicenter location corrected by 4.5 km (2.8 mi) towards E.

Earthquake details

Date & time	Mar 18, 2023 09:18:49 UTC -
Local time at epicenter	Saturday, Mar 18, 2023 at 8:18 am (GMT -1)
Status	Confirmed
Magnitude	2.1
Depth	1.0 km
Epicenter latitude / longitude	38.735°N / 27.357°W (Angra do Heroismo Municipality, Azores, Portugal)
Antipode	38.735°S / 152.643°E
Shaking intensity	Weak shaking near epicenter
Felt	0 reports
Primary data source	IPMA (Portuguese Institute for Sea and Atmosphere (Instituto Português do Mar e da Atmosfera, IPMA))
Nearest volcano	Terceira (3 km / 2 mi)
Nearby towns and cities	5 km (3 mi) NNW of Santa Barbara (pop: 1,270) \| Show on map \| Quakes nearby 11 km (7 mi) WSW of Biscoitos (pop: 1,430) \| Show on map \| Quakes nearby 15 km (9 mi) NW of Angra do Heroismo (Angra do Heroísmo Municipality) (pop: 12,000) \| Show on map \| Quakes nearby 25 km (16 mi) W of Praia da Vitoria (Praia da Vitória) (pop: 6,060) \| Show on map \| Quakes nearby 59 km (37 mi) ENE of Calheta (pop: 3,770) \| Show on map \| Quakes nearby 68 km (42 mi) SE of Santa Cruz da Graciosa (pop: 1,780) \| Show on map \| Quakes nearby 86 km (54 mi) ENE of San Roque (pop: 3,710) \| Show on map \| Quakes nearby 87 km (54 mi) ENE of Lajes (pop: 4,710) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Overcast Clouds 16.7°C (62 F), humidity: 94%, wind: 9 m/s (17 kts) from S
Estimated seismic energy released	8.9 x 10⁷ joules (24.8 kilowatt hours) \| 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
2.1	1 km	Portugal: Serreta (Terceira)	IPMA
2.0	0 km	Portugal: SW Serreta (Terceira)	IVAR (AZO)

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Seismograms

Seismic station: (ROSA/PM network) | Distance from quake: 77 km / 48 mi | Show on map | Station Info

Seismic station : 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: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake

At magnitude 2.1, such a quake wouldn't normally be felt by people except under very favorable conditions.

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

There are no user reports for this quake.

Earlier earthquakes in the same area

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