Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 17-04-2023 and time 17:28:16 (Italy) in region 4 km SE Geraci Siculo (PA)

A magnitude ML 1.7 earthquake occured in region: 4 km SE Geraci Siculo (PA), on

  • 17-04-2023 15:28:16 (UTC)
  • 17-04-2023 17:28:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8360, 14.1880 at 8 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
Geraci Siculo PA 4 1945 1945
Gangi PA 4 6811 8756
Petralia Soprana PA 8 3360 12116
San Mauro Castelverde PA 9 1701 13817
Petralia Sottana PA 9 2821 16638
Castel di Lucio ME 12 1294 17932
Bompietro PA 13 1401 19333
Blufi PA 13 1029 20362
Castellana Sicula PA 14 3411 23773
Castelbuono PA 14 8943 32716
Sperlinga EN 17 805 33521
Polizzi Generosa PA 17 3407 36928
Alimena PA 17 2032 38960
Tusa ME 17 2925 41885
Pettineo ME 17 1350 43235
Pollina PA 18 2974 46209
Mistretta ME 19 4791 51000
Motta d'Affermo ME 19 739 51739

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km N of Caltanissetta (63360 inhabitants)
65 Km E of Bagheria (55387 inhabitants)
79 Km E of Palermo (674435 inhabitants)
79 Km NE of Agrigento (59770 inhabitants)
86 Km N of Gela (75827 inhabitants)
87 Km W of Catania (314555 inhabitants)
90 Km W of Acireale (52622 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 1.7 2023-04-17
15:28:16		 37.8363 14.1885 8 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 116961161
Reviewed
Rev100 		ML 1.7 2023-04-17
15:28:16		 37.8312 14.1668 10 2023-04-17
15:40:45		 Sala Sismica INGV-Roma 116463811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-17 15:28:16 ± 0.16
Latitude 37.8363 ± 0.0090
Longitude 14.1885 ± 0.0137
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116961161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1096
Semi-minor axis of confidence ellipse (meter) 861
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 1100.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.46
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57826
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 116961161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-02 14:38:50

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 116463811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-17 15:40:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MUCR.HHZ. 2023-04-17T15:28:36.43 1.0 undecidable manual S 69 64.1913 50 -0.05 23
IV.ALJA.HHZ. 2023-04-17T15:28:30.03 0.3 undecidable manual S 256 39.3273 50 0.18 70
IV.OEM7.HHZ. 2023-04-17T15:28:30.32 3.0 undecidable manual P 0
IV.MSFR.HHE. 2023-04-17T15:28:30.33 0.1 undecidable manual S 58 41.5251 50 -0.1 95
IV.GALF.HHZ. 2023-04-17T15:28:28.38 1.0 undecidable manual S 113 35.9418 50 -0.57 21
IV.MUCR.HHZ. 2023-04-17T15:28:28.35 0.1 undecidable manual P 69 64.1913 50 0.42 85
IV.CPTP.HHZ. 2023-04-17T15:28:26.27 0.1 undecidable manual P 183 47.619 50 0.89 73
IV.RESU.HHZ. 2023-04-17T15:28:25.52 0.3 undecidable manual S 209 23.9538 109 0.49 67
IV.MSFR.HHE. 2023-04-17T15:28:24.10 0.1 undecidable manual P 58 41.5251 50 -0.33 90
IV.GALF.HHZ. 2023-04-17T15:28:23.50 0.1 undecidable manual P 113 35.9418 50 -0.08 96
IV.PLLN.EHZ. 2023-04-17T15:28:23.98 0.3 undecidable manual S 347 17.7711 115 0.95 56
IV.ALJA.HHZ. 2023-04-17T15:28:23.64 0.3 undecidable manual P 256 39.3273 50 -0.46 66
IV.CSLB.HHZ. 2023-04-17T15:28:22.24 0.3 undecidable manual S 314 16.0728 117 -0.24 72
IV.PLLN.EHZ. 2023-04-17T15:28:20.20 0.1 undecidable manual P 347 17.7711 115 0.04 100
IV.RESU.HHZ. 2023-04-17T15:28:20.55 0.1 undecidable manual P 209 23.9538 109 -0.77 81
IV.CSLB.HHZ. 2023-04-17T15:28:19.49 0.1 undecidable manual P 314 16.0728 117 -0.35 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HHE. ML:1.4 0.00023438494999999997 0.2816 AML other m 2023-04-17T15:28:24.61
IV.PLLN.EHN. ML:1.9 0.000712329 0.3456 AML other m 2023-04-17T15:28:27.70
IV.CSLB.HHN. ML:1.3 0.000210154 0.256 AML other m 2023-04-17T15:28:24.76
IV.PLLN.EHE. ML:1.7 0.000411 1.4 AML other m 2023-04-17T15:28:25.16
IV.RESU.HHE. ML:1.8 0.000399 0.42 AML other m 2023-04-17T15:28:27.56
IV.RESU.HNE. ML:1.5 0.0002015 0.42 AML other m 2023-04-17T15:28:27.56
IV.GALF.HHE. ML:1.8 0.00022737735 0.4608 AML other m 2023-04-17T15:28:34.30
IV.GALF.HHN. ML:2.1 0.0005063324 0.5632 AML other m 2023-04-17T15:28:36.84
IV.ALJA.HHN. ML:1.8 0.0002273438 0.32 AML other m 2023-04-17T15:28:33.41
IV.ALJA.HHE. ML:1.7 0.000164 0.26 AML other m 2023-04-17T15:28:33.43
IV.RESU.HNN. ML:1.5 0.00019933825 0.4224 AML other m 2023-04-17T15:28:30.11
IV.RESU.HHN. ML:1.8 0.0003990109 0.4224 AML other m 2023-04-17T15:28:30.11
IV.MUCR.HHE. ML:1.8 0.00011665 1.32 AML other m 2023-04-17T15:28:43.31
IV.MUCR.HHN. ML:1.8 0.00012505 0.64 AML other m 2023-04-17T15:28:44.20
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