Earthquake with magnitude of ML 3.5 on date 22-09-2021 and time 04:24:28 (Italy) in region Malta [Sea]

A magnitude ML 3.5 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) 34.812, 13.963 at 17 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.

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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.39
Latitude 34.8118 ± 0.0315
Longitude 13.9633 ± 0.0613
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95720321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 6461
Semi-minor axis of confidence ellipse (meter) 1459
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 120
Circular confidence region, given by single value of horizontal uncertainty (meter) 6460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 336
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 2.6521
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 10
Magnitude information

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.PAOL.HHZ. 2021-09-22T02:26:12.37 3.0 undecidable manual Pg 10.12 0
IV.LAV9.HHZ. 2021-09-22T02:26:12.87 3.0 undecidable manual Pn 0.84 0
OT.CGL1.HHZ. 2021-09-22T02:26:10.69 3.0 negative manual Pn 4.66 0
IV.HLNI.HHZ. 2021-09-22T02:25:42.74 3.0 undecidable manual Sn 0.51 0
IV.HAGA.HHZ. 2021-09-22T02:25:42.04 0.6 undecidable manual S 21 2.6521 54 -0.76 27
IV.SSY.HHZ. 2021-09-22T02:25:40.23 0.6 undecidable manual S 21 2.51 54 0.83 32
IV.HSRS.HHZ. 2021-09-22T02:25:38.95 0.6 undecidable manual S 24 2.4965 54 -0.12 40
IV.RAFF.HHZ. 2021-09-22T02:25:36.75 1.0 undecidable manual S 8 2.4309 54 -0.74 18
IV.HAVL.HHZ. 2021-09-22T02:25:35.11 0.6 undecidable manual S 23 2.3427 54 -0.27 46
IV.ACATE.EHZ. 2021-09-22T02:25:33.34 3.0 undecidable manual Sn 0.72 0
IV.HPAC.HHZ. 2021-09-22T02:25:29.47 0.3 undecidable manual S 24 2.0855 54 0.22 86
IV.ISPIC.EHZ. 2021-09-22T02:25:29.92 0.6 undecidable manual S 21 2.1098 54 0.11 58
IV.MPNC.HHZ. 2021-09-22T02:25:24.77 3.0 negative manual Pn -0.4 0
IV.MUCR.HHZ. 2021-09-22T02:25:21.94 3.0 undecidable manual Pn -0.3 0
IV.EPZF.HHZ. 2021-09-22T02:25:19.40 3.0 positive manual Pn 0.11 0
IV.SCIAC.HHZ. 2021-09-22T02:25:12.38 3.0 negative manual P -3.1 0
IV.CPTP.HHZ. 2021-09-22T02:25:12.66 3.0 negative manual Pn 0.26 0
IV.HLNI.HHZ. 2021-09-22T02:25:10.93 3.0 undecidable manual Pn -2.17 0
IV.HAGA.HHZ. 2021-09-22T02:25:10.99 0.6 undecidable manual P 21 2.6521 54 -0.51 30
IV.SSY.HHZ. 2021-09-22T02:25:09.38 0.3 positive manual P 21 2.51 54 -0.16 59
IV.HVZN.HHZ. 2021-09-22T02:25:09.50 0.6 positive manual P 14 2.4417 54 0.91 33
IV.HSRS.HHZ. 2021-09-22T02:25:09.70 0.6 undecidable manual P 24 2.4965 54 0.36 38
IV.RAFF.HHZ. 2021-09-22T02:25:08.25 1.0 negative manual P 8 2.4309 54 -0.18 21
IV.CLTA.HHZ. 2021-09-22T02:25:07.33 0.3 undecidable manual P 360 2.3445 54 0.08 71
IV.HAVL.HHZ. 2021-09-22T02:25:06.61 1.0 positive manual P 23 2.3427 54 -0.61 21
IV.ISPIC.EHZ. 2021-09-22T02:25:04.13 0.6 undecidable manual P 21 2.1098 54 0.13 58
MN.WDD.HHZ. 2021-09-22T02:25:04.47 0.6 undecidable manual S 24 1.1224 93 -0.01 100
IV.HPAC.HHZ. 2021-09-22T02:25:03.48 0.3 undecidable manual P 24 2.0855 54 -0.19 87
MN.WDD.HHZ. 2021-09-22T02:24:49.40 1.0 positive manual P 24 1.1224 93 0.03 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.WDD.HHE. ML:3.7 0.00352 0.58 AML other m 2021-09-22T02:25:05.13
MN.WDD.HHN. ML:3.3 0.00141 1.58 AML other m 2021-09-22T02:25:10.08
IV.HPAC.HHN. ML:3.7 0.001083 1.14 AML other m 2021-09-22T02:25:39.93
IV.ACATE.EHN. ML:3.5 0.000558 1.02 AML other m 2021-09-22T02:25:42.66
IV.CLTA.HHE. ML:3.1 0.0002 0.6 AML other m 2021-09-22T02:25:45.24
IV.ACATE.HNN. ML:3.3 0.0003465 0.96 AML other m 2021-09-22T02:25:45.93
IV.ISPIC.EHE. ML:3.4 0.000633 0.6 AML other m 2021-09-22T02:25:47.00
IV.ISPIC.HNE. ML:3.5 0.000785 0.6 AML other m 2021-09-22T02:25:47.30
IV.HAVL.HHE. ML:3.4 0.000482 1.56 AML other m 2021-09-22T02:25:50.90
IV.ACATE.EHE. ML:3.5 0.00063251685 1.1008 AML other m 2021-09-22T02:25:45.44
IV.ACATE.HNE. ML:3.4 0.00047306045 1.9408 AML other m 2021-09-22T02:25:52.95
IV.HPAC.HHE. ML:3.8 0.001305 0.54 AML other m 2021-09-22T02:25:51.79
IV.SCIAC.HHE. ML:2.8 7.895E-5 0.66 AML other m 2021-09-22T02:25:52.28
IV.HVZN.HHE. ML:3.7 0.0008485 0.46 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 0.000632 0.92 AML other m 2021-09-22T02:25:54.22
IV.RAFF.HHE. ML:3.5 0.0004605 0.54 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.SSY.HHN. ML:4.1 0.00201 0.88 AML other m 2021-09-22T02:25:55.42
IV.RAFF.HHN. ML:3.3 0.00029 0.52 AML other m 2021-09-22T02:25:55.86
IV.ISPIC.HNN. ML:3.3 0.0004625 0.66 AML other m 2021-09-22T02:25:59.30
IV.ISPIC.EHN. ML:3.3 0.000429 0.42 AML other m 2021-09-22T02:25:59.31
IV.SSY.HHE. ML:4.1 0.00186 0.82 AML other m 2021-09-22T02:26:00.08
IV.HSRS.HHE. ML:3.3 0.0002805 0.42 AML other m 2021-09-22T02:26:02.75
IV.HAGA.HHN. ML:3.5 0.0004 0.72 AML other m 2021-09-22T02:26:04.14
IV.HVZN.HHN. ML:3.6 0.000573 0.58 AML other m 2021-09-22T02:26:05.40
IV.HVZN.HNN. ML:3.5 0.000525 0.58 AML other m 2021-09-22T02:26:05.40
IV.CLTA.HHN. ML:3 0.000167 1.58 AML other m 2021-09-22T02:26:06.02
IV.CPTP.HHE. ML:3.5 0.0004125 0.64 AML other m 2021-09-22T02:26:08.57
IV.HAGA.HHE. ML:3.4 0.0003505 0.94 AML other m 2021-09-22T02:26:10.03
IV.SCIAC.HHN. ML:3 0.00010995 0.42 AML other m 2021-09-22T02:26:14.89
IV.MPNC.HHE. ML:3.5 0.000183 0.5 AML other m 2021-09-22T02:26:17.88
IV.MUCR.HHE. ML:3.2 0.00011965 0.9 AML other m 2021-09-22T02:26:19.91
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 0.0002365 1.58 AML other m 2021-09-22T02:26:27.84
IV.MPNC.HHN. ML:3.4 0.0001685 1.3 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