Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 3.4 on date 22-09-2021 and time 02:24:28 (UTC) in region Malta [Sea]

A magnitude ML 3.4 earthquake occured in region: Malta [Sea], on

  • 22-09-2021 02:24:28 (UTC)
  • 22-09-2021 04:24:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 34.8040, 13.9480 at 17 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 3.4 2021-09-22
02:24:28		 34.8038 13.948 17 2022-03-30
13:04:11		 Bollettino Sismico Italiano INGV 96481341
Reviewed
Rev100 		ML 3.5 2021-09-22
02:24:28		 34.8118 13.9633 17 2021-09-22
02:35:38		 Sala Sismica INGV-Roma 95720321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 02:24:28 ± 0.22
Latitude 34.8038 ± 0.0099
Longitude 13.9480 ± 0.0066
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96481341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 877
Semi-minor axis of confidence ellipse (meter) 812
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 327
Circular confidence region, given by single value of horizontal uncertainty (meter) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 279
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 1.13494
Epicentral distance of station farthest from the epicenter (degree) 3.52624
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:3.4

Field Value
Value 3.4
Uncertainty 0.2
Num. used stations 36
Type of magnitude ML
Reference to an origin 96481341
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-21 15:19:16

ML:3.5

Field Value
Value 3.5
Uncertainty 0.2
Num. used stations 37
Type of magnitude ML
Reference to an origin 95720321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 02:35:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-09-22T02:25:42.57 0.6 undecidable manual S 21 2.6647 54 -0.3 16
IV.HLNI.HHZ. 2021-09-22T02:25:42.65 0.6 undecidable manual S 16 2.6503 54 0.12 17
IV.SSY.HHZ. 2021-09-22T02:25:39.55 0.6 undecidable manual S 21 2.5226 54 0.08 20
IV.HVZN.HHZ. 2021-09-22T02:25:38.22 0.6 undecidable manual S 14 2.4525 54 0.41 21
IV.HSRS.HHZ. 2021-09-22T02:25:38.95 0.6 undecidable manual S 24 2.5091 54 -0.2 20
IV.RAFF.HHZ. 2021-09-22T02:25:37.37 1.0 undecidable manual S 8 2.4399 54 -0.14 11
IV.HAVL.HHZ. 2021-09-22T02:25:35.11 0.6 undecidable manual S 23 2.3544 54 -0.35 23
IV.HMDC.HNN. 2021-09-22T02:25:33.11 0.6 undecidable manual S 17 2.2573 54 -0.02 27
IV.HVIT.HHZ. 2021-09-22T02:25:32.17 0.6 undecidable manual S 12 2.2357 54 -0.45 25
IV.HPAC.HHZ. 2021-09-22T02:25:29.47 0.3 undecidable manual S 25 2.0981 54 0.14 45
IV.ISPIC.EHZ. 2021-09-22T02:25:29.92 0.6 undecidable manual S 21 2.1215 54 0.04 30
IV.MPNC.HHZ. 2021-09-22T02:25:24.22 1.0 undecidable manual P 18 3.5262 54 0.82 6
IV.MUCR.HHZ. 2021-09-22T02:25:20.11 0.6 undecidable manual P 13 3.3212 54 -0.47 14
IV.EPZF.HHZ. 2021-09-22T02:25:18.68 0.6 undecidable manual P 13 3.1054 54 1.09 11
IV.SCIAC.HHZ. 2021-09-22T02:25:12.96 1.0 undecidable manual P 346 2.7960 54 -0.35 8
IV.LINA.HHE. 2021-09-22T02:25:12.62 0.6 undecidable manual S 321 1.3859 93 0.42 44
IV.CPTP.HHZ. 2021-09-22T02:25:11.40 1.0 undecidable manual P 4 2.6080 54 0.68 8
IV.HLNI.HHZ. 2021-09-22T02:25:10.96 0.6 undecidable manual P 16 2.6503 54 -0.34 16
IV.HAGA.HHZ. 2021-09-22T02:25:10.99 0.6 undecidable manual P 21 2.6647 54 -0.51 15
IV.SSY.HHZ. 2021-09-22T02:25:09.36 0.3 undecidable manual P 21 2.5226 54 -0.18 30
IV.HVZN.HHZ. 2021-09-22T02:25:09.15 1.0 undecidable manual P 14 2.4525 54 0.57 10
IV.LPDG.HHE. 2021-09-22T02:25:09.03 0.6 undecidable manual S 304 1.2923 93 -0.39 46
IV.HSRS.HHZ. 2021-09-22T02:25:09.70 0.6 undecidable manual P 24 2.5091 54 0.35 20
IV.RAFF.HHZ. 2021-09-22T02:25:08.25 1.0 undecidable manual P 8 2.4399 54 -0.15 11
IV.CLTA.HHZ. 2021-09-22T02:25:07.33 0.3 undecidable manual P 0 2.3526 54 0.14 36
IV.HMDC.HNN. 2021-09-22T02:25:06.31 0.6 undecidable manual P 17 2.2573 54 0.43 25
IV.HVIT.HHZ. 2021-09-22T02:25:06.46 0.6 undecidable manual P 12 2.2357 54 0.88 21
IV.HAVL.HHZ. 2021-09-22T02:25:06.95 1.0 undecidable manual P 23 2.3544 54 -0.27 12
IV.ISPIC.EHZ. 2021-09-22T02:25:04.13 0.6 undecidable manual P 21 2.1215 54 0.13 30
MN.WDD.HHZ. 2021-09-22T02:25:04.47 0.6 undecidable manual S 24 1.1349 93 -0.29 49
IV.HPAC.HHZ. 2021-09-22T02:25:03.48 0.3 undecidable manual P 25 2.0981 54 -0.2 45
IV.LINA.HHE. 2021-09-22T02:24:53.76 0.1 undecidable manual P 321 1.3859 93 -0.03 96
IV.LPDG.HHE. 2021-09-22T02:24:52.17 0.1 undecidable manual P 304 1.2923 93 -0.02 100
MN.WDD.HHZ. 2021-09-22T02:24:49.38 1.0 undecidable manual P 24 1.1349 93 -0.12 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.WDD.HHE. ML:3.7 0.0035199999999999997 0.58 AML other m 2021-09-22T02:25:05.13
MN.WDD.HHN. ML:3.3 0.0013008685 0.3792 AML other m 2021-09-22T02:25:10.78
IV.HPAC.HHN. ML:3.7 0.00108218545 0.8608 AML other m 2021-09-22T02:25:39.93
IV.CLTA.HHE. ML:3.0 0.0001608443 0.72 AML other m 2021-09-22T02:25:54.26
IV.SCIAC.HHE. ML:2.8 0.000071464335 0.28 AML other m 2021-09-22T02:25:45.91
IV.HSRS.HNE. ML:2.9 0.0001243737 0.6896 AML other m 2021-09-22T02:25:46.36
IV.SCIAC.HHN. ML:2.8 0.00007372991 0.2208 AML other m 2021-09-22T02:25:46.75
IV.ISPIC.HNE. ML:3.6 0.0007850850499999999 0.6 AML other m 2021-09-22T02:25:47.30
IV.ISPIC.EHE. ML:3.4 0.000633 0.6 AML other m 2021-09-22T02:25:47.00
IV.HAVL.HHE. ML:3.4 0.000482 1.56 AML other m 2021-09-22T02:25:50.90
IV.SSY.HHN. ML:4.1 0.0018408165 0.3008 AML other m 2021-09-22T02:25:50.36
IV.HPAC.HHE. ML:3.8 0.0013053694999999998 0.5392 AML other m 2021-09-22T02:25:51.79
IV.HVZN.HHE. ML:3.7 0.00084868175 0.4592 AML other m 2021-09-22T02:25:52.98
IV.HVZN.HNE. ML:3.7 0.0008195 0.46 AML other m 2021-09-22T02:25:52.98
IV.HAVL.HHN. ML:3.5 0.0005727845000000001 0.5008 AML other m 2021-09-22T02:25:56.19
IV.RAFF.HHE. ML:3.5 0.00046046995 0.5392 AML other m 2021-09-22T02:25:54.67
IV.HSRS.HHN. ML:3.4 0.0003825 1.48 AML other m 2021-09-22T02:25:55.01
IV.HSRS.HHE. ML:3.3 0.00027824475000000007 0.4592 AML other m 2021-09-22T02:25:55.75
IV.RAFF.HHN. ML:3.3 0.00029000000000000006 0.52 AML other m 2021-09-22T02:25:55.86
IV.ISPIC.HNN. ML:3.3 0.00046273880000000003 0.6704 AML other m 2021-09-22T02:25:59.30
IV.ISPIC.EHN. ML:3.3 0.0004162987 0.6592 AML other m 2021-09-22T02:25:59.32
IV.SSY.HHE. ML:4.1 0.0018599999999999999 0.82 AML other m 2021-09-22T02:26:00.08
IV.HAGA.HHN. ML:3.4 0.00035241505 0.56 AML other m 2021-09-22T02:26:01.56
IV.HLNI.HHN. ML:3.4 0.00029268125 0.72 AML other m 2021-09-22T02:26:01.68
IV.HVZN.HHN. ML:3.6 0.00057306195 0.5808 AML other m 2021-09-22T02:26:05.40
IV.HVZN.HNN. ML:3.5 0.0005250000000000001 0.58 AML other m 2021-09-22T02:26:05.40
IV.CLTA.HHN. ML:2.9 0.00014438945 1.1408 AML other m 2021-09-22T02:26:06.00
IV.CPTP.HHE. ML:3.5 0.00041285165 0.64 AML other m 2021-09-22T02:26:08.57
IV.HAGA.HHE. ML:3.4 0.0003505165 0.9392 AML other m 2021-09-22T02:26:10.03
IV.CPTP.HHN. ML:3.5 0.00041347374999999996 1.1808 AML other m 2021-09-22T02:26:16.82
IV.MPNC.HHE. ML:3.5 0.00018307574999999998 0.4992 AML other m 2021-09-22T02:26:17.88
IV.MUCR.HHE. ML:3.2 0.00011913768999999999 0.48 AML other m 2021-09-22T02:26:18.92
IV.EPZF.HHE. ML:3.6 0.0003205 1.28 AML other m 2021-09-22T02:26:22.95
IV.MUCR.HHN. ML:3.3 0.000133 1.34 AML other m 2021-09-22T02:26:23.73
IV.EPZF.HHN. ML:3.4 0.00022274745000000002 0.6592 AML other m 2021-09-22T02:26:26.42
IV.MPNC.HHN. ML:3.4 0.00016835195000000001 0.7008 AML other m 2021-09-22T02:26:38.18
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