Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 23-09-2020 and time 23:49:23 (Italy) in region 2 km W Gibellina (TP)

A magnitude ML 1.4 earthquake occured in region: 2 km W Gibellina (TP), on

  • 23-09-2020 21:49:23 (UTC)
  • 23-09-2020 23:49:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8170, 12.8500 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Gibellina TP 2 4115 4115
Salemi TP 4 10794 14909
Santa Ninfa TP 5 5043 19952
Vita TP 7 2056 22008
Calatafimi-Segesta TP 11 6712 28720
Partanna TP 11 10607 39327
Salaparuta TP 15 1696 41023
Castelvetrano TP 16 31806 72829
Poggioreale TP 17 1494 74323
Montevago AG 18 3006 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NE of Mazara del Vallo (51718 inhabitants)
37 Km E of Marsala (83194 inhabitants)
37 Km SE of Trapani (68759 inhabitants)
56 Km SW of Palermo (674435 inhabitants)
65 Km W of Bagheria (55387 inhabitants)
86 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 1.4 2020-09-23
21:49:23		 37.8173 12.8502 18 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86701681
Reviewed
Rev100 		ML 1.3 2020-09-23
21:49:23		 37.8293 12.8408 13 2020-09-23
21:56:57		 Sala Sismica INGV-Roma 83170611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-23 21:49:23 ± 0.26
Latitude 37.8173 ± 0.0090
Longitude 12.8502 ± 0.0102
Depth (km) 18 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86701681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1107
Semi-minor axis of confidence ellipse (meter) 168
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 147
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.06295
Epicentral distance of station farthest from the epicenter (degree) 0.36602
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 86701681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-30 01:30:28

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 83170611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-23 21:56:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CORL.HHZ. 2020-09-23T21:49:38.84 0.6 undecidable manual S 78 40.626 104 1.55 0
IV.ERC.EHN. 2020-09-23T21:49:36.41 0.6 undecidable manual S 317 33.5442 107 0.93 9
IV.MARS.EHZ. 2020-09-23T21:49:33.61 0.6 undecidable manual S 254 26.0517 114 0.02 40
IV.MMGO.HHE. 2020-09-23T21:49:32.00 0.6 undecidable manual S 147 20.4684 122 -0.29 47
IV.SCIAC.HHN. 2020-09-23T21:49:32.09 0.3 undecidable manual P 146 40.0266 104 0.6 0
IV.CORL.HHZ. 2020-09-23T21:49:32.85 0.3 undecidable manual P 78 40.626 104 1.27 0
IV.CAVT.HHZ. 2020-09-23T21:49:31.44 0.6 undecidable manual S 208 17.4714 127 -0.18 49
IV.CRJA.HHZ. 2020-09-23T21:49:31.78 0.6 undecidable manual S 97 13.5753 136 0.93 39
IV.ERC.EHN. 2020-09-23T21:49:31.78 0.6 undecidable manual P 317 33.5442 107 1.25 8
IV.MBFT.HHZ. 2020-09-23T21:49:30.64 0.6 undecidable manual S 32 16.872 128 -0.86 38
IV.MFNL.HHZ. 2020-09-23T21:49:29.77 0.3 undecidable manual S 115 6.993 155 -0.06 74
IV.MARS.EHZ. 2020-09-23T21:49:29.36 0.1 undecidable manual P 254 26.0517 114 -0.08 80
IV.CRJA.HHZ. 2020-09-23T21:49:28.32 0.1 undecidable manual P 97 13.5753 136 0.46 92
IV.MMGO.HHE. 2020-09-23T21:49:28.68 0.1 undecidable manual P 147 20.4684 122 -0.01 100
IV.CAVT.HHZ. 2020-09-23T21:49:28.19 0.1 undecidable manual P 208 17.4714 127 -0.12 98
IV.MFNL.HHZ. 2020-09-23T21:49:27.38 0.1 negative manual P 115 6.993 155 0.11 99
IV.MBFT.HHZ. 2020-09-23T21:49:27.96 0.1 undecidable manual P 32 16.872 128 -0.28 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MFNL.HHE. ML:1.6 0.000322 0.08 AML other m 2020-09-23T21:49:30.02
IV.MFNL.HHN. ML:1.5 0.0002585 0.52 AML other m 2020-09-23T21:49:30.02
IV.CRJA.HHN. ML:1.2 0.00011355 1.6 AML other m 2020-09-23T21:49:32.00
IV.CRJA.HHE. ML:1.1 0.00009675000000000001 0.48 AML other m 2020-09-23T21:49:32.07
IV.MARS.EHN. ML:1.7 0.00023099999999999998 0.22 AML other m 2020-09-23T21:49:33.88
IV.MARS.EHE. ML:1.5 0.00015949999999999997 0.62 AML other m 2020-09-23T21:49:38.98
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