Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 3.1 on date 31-01-2023 and time 13:12:30 (Italy) in region Malta [Sea]

A magnitude ML 3.1 earthquake occured in region: Malta [Sea], on

  • 31-01-2023 12:12:30 (UTC)
  • 31-01-2023 13:12:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 34.7910, 14.4620 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 3.1 2023-01-31
12:12:30		 34.7907 14.4622 10 2023-01-31
12:47:27		 Sala Sismica INGV-Roma 113934871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-01-31 12:12:30 ± 1.1
Latitude 34.7907 ± 0.0791
Longitude 14.4622 ± 0.0942
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 113934871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 9510
Semi-minor axis of confidence ellipse (meter) 7720
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 9510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 334
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 3.57121
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 21
Magnitude information

ML:3.1

Field Value
Value 3.1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 113934871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-01-31 12:47:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PAOL.HHZ. 2023-01-31T12:14:53.38 3.0 undecidable manual Sn 5.34 0
IV.CDRU.HHZ. 2023-01-31T12:14:46.16 3.0 undecidable manual Sg 10.04 0
IV.FAGN.HHZ. 2023-01-31T12:14:38.42 3.0 negative manual Pg 17.030001 0
IV.ARVD.HHZ. 2023-01-31T12:14:36.71 3.0 negative manual Pn -2.48 0
IV.CAR1.HHZ. 2023-01-31T12:14:17.35 3.0 undecidable manual Sn 3.13 0
IV.SALB.HHZ. 2023-01-31T12:13:56.41 3.0 undecidable manual Pn 3.66 0
IV.HCRL.HHE. 2023-01-31T12:13:43.10 0.6 undecidable manual S 10 2.5334 38 0.03 47
IV.GRI.EHZ. 2023-01-31T12:13:42.84 3.0 positive manual Pn 1.34 0
IV.MSRU.HHZ. 2023-01-31T12:13:27.59 0.6 positive manual P 13 3.5712 38 0.77 22
IV.MUCR.HHZ. 2023-01-31T12:13:23.02 0.6 negative manual P 6 3.2672 38 0.4 30
IV.MSFR.HHZ. 2023-01-31T12:13:22.85 1.0 undecidable manual P 2 3.2430 38 0.57 15
IV.CSLB.HHZ. 2023-01-31T12:13:21.95 0.6 negative manual P 354 3.1620 38 0.79 28
IV.EPZF.HHZ. 2023-01-31T12:13:20.28 0.1 undecidable manual P 6 3.0478 38 0.69 62
IV.GALF.HHN. 2023-01-31T12:13:18.75 0.1 undecidable manual P 2 2.9192 38 0.93 60
IV.CPTP.HHE. 2023-01-31T12:13:14.52 0.1 undecidable manual P 355 2.6260 38 0.75 74
IV.HLNI.HHZ. 2023-01-31T12:13:12.75 0.1 undecidable manual P 7 2.5775 38 -0.34 87
IV.HAGA.HHN. 2023-01-31T12:13:12.25 0.1 undecidable manual P 12 2.5550 38 -0.53 84
IV.RAFF.HHZ. 2023-01-31T12:13:11.41 0.6 positive manual P 358 2.4318 38 0.33 46
IV.HCRL.HHE. 2023-01-31T12:13:11.75 0.1 undecidable manual P 10 2.5334 38 -0.73 78
IV.HVZN.HHZ. 2023-01-31T12:13:11.37 0.3 positive manual P 5 2.3949 38 0.8 60
1J.FX01.HHE. 2023-01-31T12:13:10.69 0.1 undecidable manual P 16 2.3652 38 0.53 91
IV.HSRS.HNE. 2023-01-31T12:13:10.44 0.1 undecidable manual P 15 2.3814 38 0.06 100
IV.SSY.HNZ. 2023-01-31T12:13:10.79 0.1 undecidable manual P 12 2.4165 38 -0.08 98
IV.CLTA.HHZ. 2023-01-31T12:13:10.19 0.1 undecidable manual P 350 2.4003 38 -0.45 91
IV.HVIT.HHE. 2023-01-31T12:13:07.23 0.1 undecidable manual P 1 2.2006 38 -0.66 91
IV.HAVL.HHN. 2023-01-31T12:13:07.71 0.1 undecidable manual P 14 2.2321 38 -0.62 92
IV.HMDC.HHN. 2023-01-31T12:13:07.08 0.1 undecidable manual P 7 2.1827 38 -0.56 96
IV.CROCE.HHZ. 2023-01-31T12:13:05.10 0.1 undecidable manual P 2 2.0415 38 -0.59 100
IV.HPAC.HHE. 2023-01-31T12:13:05.61 0.1 undecidable manual P 14 1.9722 38 0.87 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HVZN.HHE. ML:3.2 0.0002855 1.58 AML other m 2023-01-31T12:13:22.13
IV.HVZN.HHN. ML:3.3 0.0003185 1.2 AML other m 2023-01-31T12:13:22.14
IV.HLNI.HHE. ML:2.8 0.000087721915 0.2752 AML other m 2023-01-31T12:13:26.95
IV.HLNI.HHN. ML:2.9 0.00010421640000000001 0.3584 AML other m 2023-01-31T12:13:27.80
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download