Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 26-09-2020 and time 19:44:17 (UTC) in region 2 km E Salemi (TP)

A magnitude ML 2.1 earthquake occured in region: 2 km E Salemi (TP), on

  • 26-09-2020 19:44:17 (UTC)
  • 26-09-2020 21:44:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8260, 12.8260 at 10 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Salemi TP 2 10794 10794
Gibellina TP 4 4115 14909
Vita TP 5 2056 16965
Santa Ninfa TP 8 5043 22008
Calatafimi-Segesta TP 11 6712 28720
Partanna TP 13 10607 39327
Castelvetrano TP 17 31806 71133
Salaparuta TP 18 1696 72829
Poggioreale TP 20 1494 74323
Montevago AG 20 3006 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km NE of Mazara del Vallo (51718 inhabitants)
34 Km E of Marsala (83194 inhabitants)
35 Km SE of Trapani (68759 inhabitants)
57 Km SW of Palermo (674435 inhabitants)
66 Km W of Bagheria (55387 inhabitants)
88 Km NW of Agrigento (59770 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 2.1 2020-09-26
19:44:17		 37.826 12.8258 10 2021-02-26
14:55:57		 Bollettino Sismico Italiano INGV 83516351
Reviewed
Rev100 		ML 2.4 2020-09-26
19:44:17		 37.8478 12.8273 13 2020-09-26
19:53:26		 Sala Sismica INGV-Roma 83280741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-26 19:44:17 ± 0.13
Latitude 37.8260 ± 0.0063
Longitude 12.8258 ± 0.0080
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83516351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 734
Semi-minor axis of confidence ellipse (meter) 244
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 3
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.01619
Epicentral distance of station farthest from the epicenter (degree) 0.38311
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 83280741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-26 19:53:26

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 15
Type of magnitude ML
Reference to an origin 83516351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-13 11:34:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SCIAC.HHZ. 2020-09-26T19:44:31.16 0.6 undecidable manual S 145 42.0246 50 -0.6 41
IV.ERC.EHN. 2020-09-26T19:44:29.58 0.6 undecidable manual S 318 31.4463 50 0.66 41
IV.MARS.EHZ. 2020-09-26T19:44:27.07 0.3 undecidable manual S 251 24.2535 112 0.16 71
IV.CORL.HHZ. 2020-09-26T19:44:26.30 0.6 undecidable manual P 80 42.5241 50 0.36 44
IV.ERC.EHN. 2020-09-26T19:44:25.36 0.3 undecidable manual P 318 31.4463 50 1.14 50
IV.SCIAC.HHZ. 2020-09-26T19:44:25.33 0.6 undecidable manual P 145 42.0246 50 -0.53 42
IV.CAVT.HHZ. 2020-09-26T19:44:24.89 0.3 undecidable manual S 201 17.4714 120 0.12 73
IV.MBFT.HHZ. 2020-09-26T19:44:24.30 0.6 undecidable manual S 40 17.3715 120 -0.46 45
IV.CRJA.HHZ. 2020-09-26T19:44:24.95 0.6 undecidable manual S 100 15.873 122 0.65 42
X3.T1582.EHZ. 2020-09-26T19:44:23.31 0.6 undecidable manual S 205 9.7791 135 0.67 42
X3.T1581.EHZ. 2020-09-26T19:44:23.14 0.6 undecidable manual S 284 12.4764 128 -0.19 48
IV.MARS.EHZ. 2020-09-26T19:44:22.78 0.3 undecidable manual P 251 24.2535 112 -0.28 70
IV.MFNL.HHZ. 2020-09-26T19:44:22.99 0.6 undecidable manual S 115 9.2796 137 0.46 46
IV.MMGO.HHN. 2020-09-26T19:44:22.14 0.1 undecidable manual P 144 22.4553 114 -0.6 85
IV.MTGR.HHZ. 2020-09-26T19:44:21.83 0.6 undecidable manual S 322 9.4794 136 -0.74 41
IV.CAVT.HHZ. 2020-09-26T19:44:21.62 0.3 undecidable manual P 201 17.4714 120 -0.21 71
IV.MBFT.HHZ. 2020-09-26T19:44:21.52 0.3 undecidable manual P 40 17.3715 120 -0.3 70
IV.CRJA.HHZ. 2020-09-26T19:44:21.70 0.3 undecidable manual P 100 15.873 122 0.14 73
X3.T1574.HNZ. 2020-09-26T19:44:21.97 0.6 undecidable manual S 350 1.7982 170 0.67 43
X3.T1581.EHZ. 2020-09-26T19:44:20.79 0.1 positive manual P 284 12.4764 128 -0.21 96
IV.MTGR.HHZ. 2020-09-26T19:44:20.13 0.1 negative manual P 322 9.4794 136 -0.42 92
X3.T1582.EHZ. 2020-09-26T19:44:20.64 0.1 positive manual P 205 9.7791 135 0.04 100
IV.MFNL.HHZ. 2020-09-26T19:44:20.75 0.3 undecidable manual P 115 9.2796 137 0.21 72
X3.T1574.HNZ. 2020-09-26T19:44:19.98 0.1 positive manual P 350 1.7982 170 0.15 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTGR.HHE. ML:1.6 0.00050062295 0.128 AML other m 2020-09-26T19:44:22.06
IV.MTGR.HHN. ML:1.8 0.00081978025 0.0768 AML other m 2020-09-26T19:44:22.58
X3.T1574.HNN. ML:2.6 0.008696553 0.1664 AML other m 2020-09-26T19:44:22.80
X3.T1574.HHN. ML:2.6 0.008867274500000001 0.1792 AML other m 2020-09-26T19:44:22.82
X3.T1574.HNE. ML:2.4 0.005412147 0.128 AML other m 2020-09-26T19:44:23.10
X3.T1574.HHE. ML:2.4 0.005350339 0.1408 AML other m 2020-09-26T19:44:23.13
IV.MFNL.HHE. ML:2.0 0.0012402088 0.0896 AML other m 2020-09-26T19:44:23.65
IV.MFNL.HHN. ML:2.0 0.001328293 0.0768 AML other m 2020-09-26T19:44:23.88
X3.T1582.EHN. ML:2.3 0.002510344 0.3584 AML other m 2020-09-26T19:44:24.28
X3.T1582.EHE. ML:2.4 0.0030405009999999997 0.32 AML other m 2020-09-26T19:44:24.45
IV.CAVT.HHN. ML:1.8 0.00047058420000000003 0.2432 AML other m 2020-09-26T19:44:25.47
IV.MARS.EHN. ML:2.3 0.0011047245 0.2304 AML other m 2020-09-26T19:44:27.31
IV.MARS.EHE. ML:1.9 0.00048231079 0.1792 AML other m 2020-09-26T19:44:27.60
IV.SCIAC.HHN. ML:1.5 0.00010943398 0.192 AML other m 2020-09-26T19:44:32.24
IV.SCIAC.HHE. ML:1.4 0.000079260775 0.3968 AML other m 2020-09-26T19:44:37.08
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
Waveforms Seismic signals in miniseed + resp format Download