Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 3.3 on date 21-06-2023 and time 06:36:03 (Italy) in region Malta [Sea]

A magnitude ML 3.3 earthquake occured in region: Malta [Sea], on

  • 21-06-2023 04:36:03 (UTC)
  • 21-06-2023 06:36:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 34.9400, 14.1020 at 16 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Bulletin
Rev1000 		ML 3.3 2023-06-21
04:36:03		 34.9398 14.1022 16 2024-09-10
16:44:26		 Bollettino Sismico Italiano INGV 127477211
Reviewed
Rev100 		ML 3.2 2023-06-21
04:36:05		 34.9728 14.1553 25 2023-06-21
04:50:02		 Sala Sismica INGV-Roma 118599701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-06-21 04:36:03 ± 0.42
Latitude 34.9398 ± 0.0261
Longitude 14.1022 ± 0.0384
Depth (km) 16 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 127477211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 4133
Semi-minor axis of confidence ellipse (meter) 1480
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 309
Circular confidence region, given by single value of horizontal uncertainty (meter) 4130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 286
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.96048
Epicentral distance of station farthest from the epicenter (degree) 3.97500
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:3.3

Field Value
Value 3.3
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 127477211
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-05-07 13:52:26

ML:3.2

Field Value
Value 3.2
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 118599701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-06-21 04:50:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2023-06-21T04:37:13.35 0.6 undecidable manual S 14 275.9127 54 -0.52 18
IV.PLAC.HHZ. 2023-06-21T04:37:04.99 0.3 undecidable manual P 27 441.225 54 0.2 19
IV.CORL.HHZ. 2023-06-21T04:36:51.51 0.3 undecidable manual P 348 335.4087 54 -0.11 22
IV.ALJA.HHZ. 2023-06-21T04:36:49.61 0.3 undecidable manual P 354 313.1532 54 0.76 19
IV.HLNI.HHZ. 2023-06-21T04:36:43.49 0.1 undecidable manual P 14 275.9127 54 -0.73 34
IV.SSY.HHZ. 2023-06-21T04:36:41.88 0.3 undecidable manual P 19 260.9388 54 -0.47 32
IV.HAVL.HHZ. 2023-06-21T04:36:39.55 0.3 undecidable manual P 22 242.0799 54 -0.45 38
IV.HMDC.HHZ. 2023-06-21T04:36:39.02 0.3 undecidable manual P 15 232.1898 54 0.25 42
ML.XLND.BHE. 2023-06-21T04:36:38.72 0.6 undecidable manual S 5 121.6893 93 0.06 49
IV.HPAC.HHZ. 2023-06-21T04:36:37.56 0.3 undecidable manual P 23 213.4308 54 1.12 35
ML.MSDA.BHE. 2023-06-21T04:36:36.20 0.6 undecidable manual S 18 112.0989 93 0.09 50
MN.WDD.HHE. 2023-06-21T04:36:34.94 0.6 undecidable manual S 21 106.6155 93 0.29 48
IV.LINA.HHE. 2023-06-21T04:36:28.74 0.6 undecidable manual P 313 152.4363 92 0.12 46
ML.XLND.BHE. 2023-06-21T04:36:23.67 0.1 undecidable manual P 5 121.6893 93 -0.22 95
ML.MSDA.BHE. 2023-06-21T04:36:22.22 0.3 undecidable manual P 18 112.0989 93 -0.19 73
MN.WDD.HHE. 2023-06-21T04:36:21.70 0.1 undecidable manual P 21 106.6155 93 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HPAC.HHN. ML:2.8 0.00018527805000000003 0.0384 AML other m 2023-06-21T04:36:59.41
IV.HPAC.HHE. ML:3.6 0.000948 0.44 AML other m 2023-06-21T04:37:12.69
IV.HMDC.HHE. ML:3.4 0.0005155 0.42 AML other m 2023-06-21T04:37:14.40
IV.HMDC.HNE. ML:3.4 0.0005204999999999999 0.42 AML other m 2023-06-21T04:37:14.20
IV.HAVL.HHE. ML:3.3 0.00040649999999999996 0.72 AML other m 2023-06-21T04:37:15.72
IV.HAVL.HHN. ML:3.5 0.0005985000000000001 0.62 AML other m 2023-06-21T04:37:22.64
IV.SSY.HHE. ML:3.4 0.000477 1.02 AML other m 2023-06-21T04:37:25.05
IV.HLNI.HNE. ML:3.2 0.000263 1.08 AML other m 2023-06-21T04:37:26.96
IV.SSY.HNE. ML:3.6 0.000757 1.5 AML other m 2023-06-21T04:37:27.14
IV.HMDC.HHN. ML:3.4 0.0005529999999999999 1.1 AML other m 2023-06-21T04:37:27.21
IV.HMDC.HNN. ML:3.3 0.0004555 1.1 AML other m 2023-06-21T04:37:27.22
IV.HLNI.HHE. ML:3.2 0.00021050000000000002 0.78 AML other m 2023-06-21T04:37:27.39
IV.HLNI.HNN. ML:3.4 0.0003605 0.66 AML other m 2023-06-21T04:37:29.57
IV.HLNI.HHN. ML:3.4 0.00035 0.68 AML other m 2023-06-21T04:37:29.56
IV.SSY.HHN. ML:3.6 0.0006965 0.42 AML other m 2023-06-21T04:37:32.38
IV.SSY.HNN. ML:3.6 0.0006405000000000001 0.56 AML other m 2023-06-21T04:37:39.31
IV.CORL.HHN. ML:2.9 0.0000701 1.34 AML other m 2023-06-21T04:37:42.27
IV.CORL.HNN. ML:2.9 0.00006994999999999999 0.46 AML other m 2023-06-21T04:37:44.26
IV.ALJA.HHN. ML:2.7 0.00006195 1.14 AML other m 2023-06-21T04:37:45.09
IV.ALJA.HHE. ML:2.9 0.00007785000000000001 0.68 AML other m 2023-06-21T04:37:47.58
IV.CORL.HHE. ML:3.0 0.00009335 0.44 AML other m 2023-06-21T04:37:49.70
IV.CORL.HNE. ML:3.0 0.0000911 1.28 AML other m 2023-06-21T04:37:49.70
IV.PLAC.HNN. ML:4.3 0.000988 0.78 AML other m 2023-06-21T04:38:06.73
IV.PLAC.HHN. ML:3.0 0.00004285 1.38 AML other m 2023-06-21T04:38:08.96
IV.PLAC.HHE. ML:3.0 0.00003965 0.86 AML other m 2023-06-21T04:38:14.47
IV.PLAC.HNE. ML:3.6 0.0001635 1.2 AML other m 2023-06-21T04:38:28.87
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download