Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 3.0 on date 27-09-2021 and time 04:27:42 (Italy) in region Malta [Sea]

A magnitude ML 3.0 earthquake occured in region: Malta [Sea], on

  • 27-09-2021 02:27:42 (UTC)
  • 27-09-2021 04:27:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 34.8020, 13.9220 at 18 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 3.0 2021-09-27
02:27:42		 34.8025 13.9215 18 2022-03-30
13:04:38		 Bollettino Sismico Italiano INGV 101108751
Reviewed
Rev100 		ML 3.0 2021-09-27
02:27:42		 34.737 13.8663 27 2021-09-27
02:44:19		 Sala Sismica INGV-Roma 95925171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 02:27:42 ± 0.5
Latitude 34.8025 ± 0.0396
Longitude 13.9215 ± 0.0635
Depth (km) 18 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101108751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 6684
Semi-minor axis of confidence ellipse (meter) 2857
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 123
Circular confidence region, given by single value of horizontal uncertainty (meter) 6680.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 317
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 4.16566
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:3.0

Field Value
Value 3.0
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 95925171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 02:44:19

ML:3.0

Field Value
Value 3.0
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 101108751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-18 11:49:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MMUR.HNZ. 2021-09-27T02:30:11.86 0.6 undecidable manual P 20.82 0
CR.STON.BHZ. 2021-09-27T02:30:10.48 1.0 undecidable manual P 22.99 0
TV.SF04.EHZ. 2021-09-27T02:30:04.73 0.3 positive manual P 17.780001 0
IV.CMPR.HNZ. 2021-09-27T02:30:03.89 3.0 undecidable manual Sg 14.72 0
IV.MTL1.HNZ. 2021-09-27T02:30:02.78 0.6 undecidable manual P 14.25 0
IV.MCRV.HHZ. 2021-09-27T02:29:24.97 0.6 undecidable manual P 11.82 0
IV.CDRU.HNZ. 2021-09-27T02:29:05.36 1.0 undecidable manual P -3.97 0
IV.HAGA.HHZ. 2021-09-27T02:28:56.81 0.6 undecidable manual S 22 2.6737 54 -0.19 33
IV.HLNI.HHZ. 2021-09-27T02:28:56.28 0.6 undecidable manual S 17 2.6575 54 -0.34 33
IV.SSY.HHZ. 2021-09-27T02:28:55.22 0.6 undecidable manual S 21 2.5316 54 1.62 22
IV.RAFF.HHZ. 2021-09-27T02:28:50.95 0.6 undecidable manual S 8 2.4444 54 -0.57 40
IV.HMDC.HHZ. 2021-09-27T02:28:46.79 1.0 undecidable manual S 18 2.2654 54 -0.44 25
IV.HVIT.HHZ. 2021-09-27T02:28:46.61 0.6 undecidable manual S 12 2.2420 54 -0.06 55
IV.PLAC.HHZ. 2021-09-27T02:28:46.39 0.6 undecidable manual P 28 4.1657 54 0.23 40
IV.ISPIC.EHZ. 2021-09-27T02:28:44.95 0.6 undecidable manual S 22 2.1305 54 0.94 46
IV.IVPL.HHZ. 2021-09-27T02:28:39.50 0.6 undecidable manual P 13 3.6710 54 0.17 29
IV.PLLN.EHZ. 2021-09-27T02:28:33.62 0.6 undecidable manual P 3 3.1935 54 0.9 24
IV.GALF.HHZ. 2021-09-27T02:28:30.50 0.3 undecidable manual P 10 2.9525 54 1.1 34
IV.MMGO.HHN. 2021-09-27T02:28:28.95 0.3 undecidable manual P 345 2.9579 54 -0.52 43
IV.CMDO.HHZ. 2021-09-27T02:28:27.68 0.3 undecidable manual P 358 2.6611 54 2.31 15
IV.HAGA.HHZ. 2021-09-27T02:28:24.91 0.3 undecidable manual P 22 2.6737 54 -0.64 44
IV.HLNI.HHZ. 2021-09-27T02:28:24.62 0.3 undecidable manual P 17 2.6575 54 -0.71 44
IV.SSY.HHZ. 2021-09-27T02:28:23.41 0.3 undecidable manual P 21 2.5316 54 -0.17 60
IV.HSRS.HNN. 2021-09-27T02:28:23.17 0.6 undecidable manual P 24 2.5190 54 -0.24 40
IV.HVZN.HNZ. 2021-09-27T02:28:23.66 0.6 undecidable manual P 15 2.4596 54 1.07 32
IV.RAFF.HHZ. 2021-09-27T02:28:22.33 0.3 undecidable manual P 8 2.4444 54 -0.05 68
IV.CLTA.HHN. 2021-09-27T02:28:21.20 0.6 undecidable manual P 1 2.3544 54 0.06 50
IV.HAVL.HHZ. 2021-09-27T02:28:20.64 0.3 undecidable manual P 24 2.3643 54 -0.64 63
IV.HMDC.HHZ. 2021-09-27T02:28:20.17 1.0 undecidable manual P 18 2.2654 54 0.26 26
IV.ACATE.HNE. 2021-09-27T02:28:20.54 1.0 undecidable manual P 12 2.2690 54 0.58 24
IV.HVIT.HHZ. 2021-09-27T02:28:18.83 0.3 undecidable manual P 12 2.2420 54 -0.76 68
MN.WDD.HHE. 2021-09-27T02:28:18.75 0.6 undecidable manual S 25 1.1448 93 -0.26 100
IV.HPAC.HHZ. 2021-09-27T02:28:17.75 0.3 undecidable manual P 25 2.1089 54 0 93
IV.ISPIC.EHZ. 2021-09-27T02:28:17.96 0.3 undecidable manual P 22 2.1305 54 -0.09 90
MN.WDD.HHE. 2021-09-27T02:28:05.02 1.0 undecidable manual P 25 1.1448 93 1.41 31
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HPAC.HHN. ML:3.1 0.00024249999999999999 1.06 AML other m 2021-09-27T02:28:26.41
IV.HMDC.HHN. ML:2.7 0.00008605 0.84 AML other m 2021-09-27T02:28:28.66
IV.HMDC.HHE. ML:2.5 0.0000623 0.38 AML other m 2021-09-27T02:28:28.52
IV.HPAC.HHE. ML:3.0 0.0002205 1.7 AML other m 2021-09-27T02:28:29.00
IV.HAVL.HHE. ML:2.9 0.0001395 0.2 AML other m 2021-09-27T02:28:31.77
IV.HAVL.HHN. ML:3.1 0.0002065 0.26 AML other m 2021-09-27T02:28:31.79
IV.RAFF.HHE. ML:2.6 0.00007005 0.76 AML other m 2021-09-27T02:28:36.22
IV.SSY.HHN. ML:3.5 0.0004485 0.92 AML other m 2021-09-27T02:28:37.23
IV.RAFF.HHN. ML:2.7 0.00008285000000000001 0.42 AML other m 2021-09-27T02:28:37.54
IV.SSY.HHE. ML:3.2 0.000212 1.58 AML other m 2021-09-27T02:28:42.19
IV.HLNI.HHE. ML:2.9 0.00010266666999999999 0.2208 AML other m 2021-09-27T02:28:57.73
IV.HAGA.HHE. ML:3.0 0.00012337866 0.3008 AML other m 2021-09-27T02:28:58.32
IV.HAGA.HHN. ML:2.9 0.000101058595 0.5808 AML other m 2021-09-27T02:29:01.51
IV.HLNI.HHN. ML:2.8 0.00008017721999999999 0.3008 AML other m 2021-09-27T02:29:02.02
IV.GALF.HHN. ML:3.2 0.000157 0.54 AML other m 2021-09-27T02:29:03.22
IV.GALF.HHE. ML:3.0 0.00010085 0.48 AML other m 2021-09-27T02:29:03.39
IV.PLLN.EHE. ML:3.3 0.00017050000000000002 0.92 AML other m 2021-09-27T02:29:18.05
IV.PLLN.EHN. ML:3.2 0.0001235 0.62 AML other m 2021-09-27T02:29:20.57
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